Graphics Utility Library

Functions
void	sceGuDepthBuffer (void *zbp, int zbw)
	Set depth buffer parameters.
void	sceGuDispBuffer (int width, int height, void *dispbp, int dispbw)
	Set display buffer parameters.
void	sceGuDrawBuffer (int psm, void *fbp, int fbw)
	Set draw buffer parameters (and store in context for buffer-swap)
void	sceGuDrawBufferList (int psm, void *fbp, int fbw)
	Set draw buffer directly, not storing parameters in the context.
int	sceGuDisplay (int state)
	Turn display on or off.
void	sceGuDepthFunc (int function)
	Select which depth-test function to use.
void	sceGuDepthMask (int mask)
	Mask depth buffer writes.
void	sceGuDepthOffset (unsigned int offset)
void	sceGuDepthRange (int near, int far)
	Set which range to use for depth calculations.
void	sceGuFog (float near, float far, unsigned int color)
void	sceGuInit (void)
	Initalize the GU system.
void	sceGuTerm (void)
	Shutdown the GU system.
void	sceGuBreak (int a0)
void	sceGuContinue (void)
void *	sceGuSetCallback (int signal, void(*callback)(int))
	Setup signal handler.
void	sceGuSignal (int signal, int behavior)
	Trigger signal to call code from the command stream.
void	sceGuSendCommandf (int cmd, float argument)
	Send raw float-command to the GE.
void	sceGuSendCommandi (int cmd, int argument)
	Send raw command to the GE.
void *	sceGuGetMemory (int size)
	Allocate memory on the current display list for temporary storage.
void	sceGuStart (int cid, void *list)
	Start filling a new display-context.
int	sceGuFinish (void)
	Finish current display list and go back to the parent context.
int	sceGuFinishId (unsigned int id)
	Finish current display list and go back to the parent context, sending argument id for the finish callback.
void	sceGuCallList (const void *list)
	Call previously generated display-list.
void	sceGuCallMode (int mode)
	Set wether to use stack-based calls or signals to handle execution of called lists.
int	sceGuCheckList (void)
	Check how large the current display-list is.
void	sceGuSendList (int mode, const void *list, PspGeContext *context)
	Send a list to the GE directly.
void *	sceGuSwapBuffers (void)
	Swap display and draw buffer.
int	sceGuSync (int mode, int what)
	Wait until display list has finished executing.
void	sceGuDrawArray (int prim, int vtype, int count, const void *indices, const void *vertices)
	Draw array of vertices forming primitives.
void	sceGuBeginObject (int vtype, int count, const void *indices, const void *vertices)
	Begin conditional rendering of object.
void	sceGuEndObject (void)
	End conditional rendering of object.
void	sceGuSetStatus (int state, int status)
	Enable or disable GE state.
int	sceGuGetStatus (int state)
	Get if state is currently enabled or disabled.
void	sceGuSetAllStatus (int status)
	Set the status on all 22 available states.
int	sceGuGetAllStatus (void)
	Query status on all 22 available states.
void	sceGuEnable (int state)
	Enable GE state.
void	sceGuDisable (int state)
	Disable GE state.
void	sceGuLight (int light, int type, int components, const ScePspFVector3 *position)
	Set light parameters.
void	sceGuLightAtt (int light, float atten0, float atten1, float atten2)
	Set light attenuation.
void	sceGuLightColor (int light, int component, unsigned int color)
	Set light color.
void	sceGuLightMode (int mode)
	Set light mode.
void	sceGuLightSpot (int light, const ScePspFVector3 *direction, float exponent, float cutoff)
	Set spotlight parameters.
void	sceGuClear (int flags)
	Clear current drawbuffer.
void	sceGuClearColor (unsigned int color)
	Set the current clear-color.
void	sceGuClearDepth (unsigned int depth)
	Set the current clear-depth.
void	sceGuClearStencil (unsigned int stencil)
	Set the current stencil clear value.
void	sceGuPixelMask (unsigned int mask)
	Set mask for which bits of the pixels to write.
void	sceGuColor (unsigned int color)
	Set current primitive color.
void	sceGuColorFunc (int func, unsigned int color, unsigned int mask)
	Set the color test function.
void	sceGuColorMaterial (int components)
	Set which color components that the material will receive.
void	sceGuAlphaFunc (int func, int value, int mask)
	Set the alpha test parameters.
void	sceGuAmbient (unsigned int color)
void	sceGuAmbientColor (unsigned int color)
void	sceGuBlendFunc (int op, int src, int dest, unsigned int srcfix, unsigned int destfix)
	Set the blending-mode.
void	sceGuMaterial (int mode, int color)
void	sceGuModelColor (unsigned int emissive, unsigned int ambient, unsigned int diffuse, unsigned int specular)
void	sceGuStencilFunc (int func, int ref, int mask)
	Set stencil function and reference value for stencil testing.
void	sceGuStencilOp (int fail, int zfail, int zpass)
	Set the stencil test actions.
void	sceGuSpecular (float power)
	Set the specular power for the material.
void	sceGuFrontFace (int order)
	Set the current face-order (for culling)
void	sceGuLogicalOp (int op)
	Set color logical operation.
void	sceGuSetDither (const ScePspIMatrix4 *matrix)
	Set ordered pixel dither matrix.
void	sceGuShadeModel (int mode)
	Set how primitives are shaded.
void	sceGuCopyImage (int psm, int sx, int sy, int width, int height, int srcw, void *src, int dx, int dy, int destw, void *dest)
	Image transfer using the GE.
void	sceGuTexEnvColor (unsigned int color)
	Specify the texture environment color.
void	sceGuTexFilter (int min, int mag)
	Set how the texture is filtered.
void	sceGuTexFlush (void)
	Flush texture page-cache.
void	sceGuTexFunc (int tfx, int tcc)
	Set how textures are applied.
void	sceGuTexImage (int mipmap, int width, int height, int tbw, const void *tbp)
	Set current texturemap.
void	sceGuTexLevelMode (unsigned int mode, float bias)
	Set texture-level mode (mipmapping)
void	sceGuTexMapMode (int mode, unsigned int a1, unsigned int a2)
	Set the texture-mapping mode.
void	sceGuTexMode (int tpsm, int maxmips, int a2, int swizzle)
	Set texture-mode parameters.
void	sceGuTexOffset (float u, float v)
	Set texture offset.
void	sceGuTexProjMapMode (int mode)
	Set texture projection-map mode.
void	sceGuTexScale (float u, float v)
	Set texture scale.
void	sceGuTexSlope (float slope)
void	sceGuTexSync ()
	Synchronize rendering pipeline with image upload.
void	sceGuTexWrap (int u, int v)
	Set if the texture should repeat or clamp.
void	sceGuClutLoad (int num_blocks, const void *cbp)
	Upload CLUT (Color Lookup Table)
void	sceGuClutMode (unsigned int cpsm, unsigned int shift, unsigned int mask, unsigned int a3)
	Set current CLUT mode.
void	sceGuOffset (unsigned int x, unsigned int y)
	Set virtual coordinate offset.
void	sceGuScissor (int x, int y, int w, int h)
	Set what to scissor within the current viewport.
void	sceGuViewport (int cx, int cy, int width, int height)
	Set current viewport.
void	sceGuDrawBezier (int vtype, int ucount, int vcount, const void *indices, const void *vertices)
	Draw bezier surface.
void	sceGuPatchDivide (unsigned int ulevel, unsigned int vlevel)
	Set dividing for patches (beziers and splines)
void	sceGuPatchFrontFace (unsigned int a0)
void	sceGuPatchPrim (int prim)
	Set primitive for patches (beziers and splines)
void	sceGuDrawSpline (int vtype, int ucount, int vcount, int uedge, int vedge, const void *indices, const void *vertices)
void	sceGuSetMatrix (int type, const ScePspFMatrix4 *matrix)
	Set transform matrices.
void	sceGuBoneMatrix (unsigned int index, const ScePspFMatrix4 *matrix)
	Specify skinning matrix entry.
void	sceGuMorphWeight (int index, float weight)
	Specify morph weight entry.
void	sceGuDrawArrayN (int primitive_type, int vertex_type, int count, int a3, const void *indices, const void *vertices)
void	guSwapBuffersBehaviour (int behaviour)
	Set how the display should be set.
void	guSwapBuffersCallback (GuSwapBuffersCallback callback)
	Set a buffer swap callback to allow for more advanced buffer methods without hacking the library.

Detailed Description

Function Documentation

guSwapBuffersBehaviour()

void guSwapBuffersBehaviour

(

int

behaviour

)

Set how the display should be set.

Available behaviours are:

• PSP_DISPLAY_SETBUF_IMMEDIATE - Display is swapped immediately
• PSP_DISPLAY_SETBUF_NEXTFRAME - Display is swapped on the next frame

Do remember that this swaps the pointers internally, regardless of setting, so be careful to wait until the next vertical blank or use another buffering algorithm (see guSwapBuffersCallback()).

References gu_settings, GuSettings::swapBuffersBehaviour, and x.

guSwapBuffersCallback()

void guSwapBuffersCallback

(

GuSwapBuffersCallback

callback

)

Set a buffer swap callback to allow for more advanced buffer methods without hacking the library.

The GuSwapBuffersCallback is defined like this:

void swapBuffersCallback(void** display, void** render);

and on entry they contain the variables that are to be set. To change the pointers that will be used, just write the new pointers. Example of a triple-buffering algorithm:

void* doneBuffer;
void swapBuffersCallback(void** display, void** render)
{
 void* active = doneBuffer;
 doneBuffer = *display;
 *display = active;
}

Parameters

callback

- Callback to access when buffers are swapped. Pass 0 to disable.

References gu_settings, and GuSettings::swapBuffersCallback.

sceGuAlphaFunc()

void sceGuAlphaFunc	(	int	func,
		int	value,
		int	mask
	)

Set the alpha test parameters.

Available comparison functions are:

• GU_NEVER
• GU_ALWAYS
• GU_EQUAL
• GU_NOTEQUAL
• GU_LESS
• GU_LEQUAL
• GU_GREATER
• GU_GEQUAL

Parameters

func	- Specifies the alpha comparison function.
value	- Specifies the reference value that incoming alpha values are compared to.
mask	- Specifies the mask that both values are ANDed with before comparison.

References a0, a1, and a2.

sceGuAmbient()

void sceGuAmbient

(

unsigned int

color

)

References x.

sceGuAmbientColor()

void sceGuAmbientColor

(

unsigned int

color

)

References x.

sceGuBeginObject()

void sceGuBeginObject	(	int	vtype,
		int	count,
		const void *	indices,
		const void *	vertices
	)

Begin conditional rendering of object.

If no vertices passed into this function are inside the scissor region, it will skip rendering the object. There can be up to 32 levels of conditional testing, and all levels HAVE to be terminated by sceGuEndObject().

Example: test a boundingbox against the frustum, and if visible, render object

sceGuBeginObject(GU_VERTEX_32BITF,8,0,boundingBox);
  sceGuDrawArray(GU_TRIANGLES,GU_TEXTURE_32BITF|GU_VERTEX_32BITF,vertexCount,0,vertices);
sceGuEndObject();

Parameters

vtype	- Vertex type to process
count	- Number of vertices to test
indices	- Optional list to an index-list
vertices	- Pointer to a vertex-list

References a1, GuDisplayList::current, gu_list, gu_object_stack, gu_object_stack_depth, and x.

sceGuBlendFunc()

void sceGuBlendFunc	(	int	op,
		int	src,
		int	dest,
		unsigned int	srcfix,
		unsigned int	destfix
	)

Set the blending-mode.

Keys for the blending operations:

• Cs - Source color
• Cd - Destination color
• Bs - Blend function for source fragment
• Bd - Blend function for destination fragment

Available blending-operations are:

• GU_ADD - (Cs*Bs) + (Cd*Bd)
• GU_SUBTRACT - (Cs*Bs) - (Cd*Bd)
• GU_REVERSE_SUBTRACT - (Cd*Bd) - (Cs*Bs)
• GU_MIN - Cs < Cd ? Cs : Cd
• GU_MAX - Cs < Cd ? Cd : Cs
• GU_ABS - |Cs-Cd|

Available blending-functions are:

• GU_SRC_COLOR
• GU_ONE_MINUS_SRC_COLOR
• GU_SRC_ALPHA
• GU_ONE_MINUS_SRC_ALPHA
• GU_DST_ALPHA
• GU_ONE_MINUS_DST_ALPHA
• GU_DST_COLOR
• GU_ONE_MINUS_DST_COLOR
• GU_FIX

Parameters

op	- Blending Operation
src	- Blending function for source operand
dest	- Blending function for dest operand
srcfix	- Fix value for GU_FIX (source operand)
destfix	- Fix value for GU_FIX (dest operand)

References x.

sceGuBoneMatrix()

void sceGuBoneMatrix	(	unsigned int	index,
		const ScePspFMatrix4 *	matrix
	)

Specify skinning matrix entry.

To enable vertex skinning, pass GU_WEIGHTS(n), where n is between 1-8, and pass available GU_WEIGHT_??? declaration. This will change the amount of weights passed in the vertex araay, and by setting the skinning, matrices, you will multiply each vertex every weight and vertex passed.

Please see sceGuDrawArray() for vertex format information.

Parameters

index	- Skinning matrix index (0-7)
matrix	- Matrix to set

References i, and x.

sceGuBreak()

void sceGuBreak

(

int

a0

)

sceGuCallList()

void sceGuCallList

(

const void *

list

)

Call previously generated display-list.

Parameters

list	- Display list to call

References gu_call_mode, and x.

sceGuCallMode()

void sceGuCallMode

(

int

mode

)

Set wether to use stack-based calls or signals to handle execution of called lists.

Parameters

mode	- GU_TRUE(1) to enable signals, GU_FALSE(0) to disable signals and use normal calls instead.

References gu_call_mode.

sceGuCheckList()

int sceGuCheckList

(

void

)

Check how large the current display-list is.

Returns

The size of the current display list

References GuDisplayList::current, gu_list, GuDisplayList::start, and x.

sceGuClear()

void sceGuClear

(

int

flags

)

Clear current drawbuffer.

Available clear-flags are (OR them together to get final clear-mode):

• GU_COLOR_BUFFER_BIT - Clears the color-buffer
• GU_STENCIL_BUFFER_BIT - Clears the stencil-buffer
• GU_DEPTH_BUFFER_BIT - Clears the depth-buffer

Parameters

flags

- Which part of the buffer to clear

References GuContext::clear_color, GuContext::clear_depth, GuContext::clear_stencil, flags, GU_COLOR_8888, GU_COLOR_BUFFER_BIT, gu_contexts, gu_curr_context, GU_DEPTH_BUFFER_BIT, gu_draw_buffer, GU_FAST_CLEAR_BIT, GU_SPRITES, GU_STENCIL_BUFFER_BIT, GU_TRANSFORM_2D, GU_VERTEX_16BIT, GuDrawBuffer::height, i, GuDrawBuffer::pixel_size, sceGuDrawArray(), sceGuGetMemory(), GuDrawBuffer::width, x, y, and z.

sceGuClearColor()

void sceGuClearColor

(

unsigned int

color

)

Set the current clear-color.

Parameters

color

- Color to clear with

References GuContext::clear_color, gu_contexts, gu_curr_context, and x.

sceGuClearDepth()

void sceGuClearDepth

(

unsigned int

depth

)

Set the current clear-depth.

Parameters

depth

- Set which depth to clear with (0x0000-0xffff)

References GuContext::clear_depth, gu_contexts, gu_curr_context, and x.

sceGuClearStencil()

void sceGuClearStencil

(

unsigned int

stencil

)

Set the current stencil clear value.

Parameters

stencil

- Set which stencil value to clear with (0-255)

References GuContext::clear_stencil, gu_contexts, gu_curr_context, and x.

sceGuClutLoad()

void sceGuClutLoad	(	int	num_blocks,
		const void *	cbp
	)

Upload CLUT (Color Lookup Table)

Note

Data must be aligned to 1 quad word (16 bytes)

Parameters

num_blocks	- How many blocks of 8 entries to upload (32*8 is 256 colors)
cbp	- Pointer to palette (16 byte aligned)

References x.

sceGuClutMode()

void sceGuClutMode	(	unsigned int	cpsm,
		unsigned int	shift,
		unsigned int	mask,
		unsigned int	a3
	)

Set current CLUT mode.

Available pixel formats for palettes are:

• GU_PSM_5650
• GU_PSM_5551
• GU_PSM_4444
• GU_PSM_8888

Parameters

cpsm	- Which pixel format to use for the palette
shift	- Shifts color index by that many bits to the right
mask	- Masks the color index with this bitmask after the shift (0-0xFF)
a3	- Unknown, set to 0

References a3, and x.

sceGuColor()

void sceGuColor

(

unsigned int

color

)

Set current primitive color.

Parameters

color

- Which color to use (overriden by vertex-colors)

References sceGuMaterial(), and x.

sceGuColorFunc()

void sceGuColorFunc	(	int	func,
		unsigned int	color,
		unsigned int	mask
	)

Set the color test function.

The color test is only performed while GU_COLOR_TEST is enabled.

Available functions are:

• GU_NEVER
• GU_ALWAYS
• GU_EQUAL
• GU_NOTEQUAL

Example: Reject any pixel that does not have 0 as the blue channel

sceGuColorFunc(GU_EQUAL,0,0xff0000);

Parameters

func	- Color test function
color	- Color to test against
mask	- Mask ANDed against both source and destination when testing

References x.

sceGuColorMaterial()

void sceGuColorMaterial

(

int

components

)

Set which color components that the material will receive.

The components are ORed together from the following values:

• GU_AMBIENT
• GU_DIFFUSE
• GU_SPECULAR

Parameters

components

- Which components to receive

References a0.

Referenced by sceGuStart().

sceGuContinue()

void sceGuContinue

(

void

)

sceGuCopyImage()

void sceGuCopyImage	(	int	psm,
		int	sx,
		int	sy,
		int	width,
		int	height,
		int	srcw,
		void *	src,
		int	dx,
		int	dy,
		int	destw,
		void *	dest
	)

Image transfer using the GE.

Note

Data must be aligned to 1 quad word (16 bytes)

Example: Copy a fullscreen 32-bit image from RAM to VRAM

sceGuCopyImage(GU_PSM_8888,0,0,480,272,512,pixels,0,0,512,(void*)(((unsigned int)framebuffer)+0x4000000));

Parameters

psm	- Pixel format for buffer
sx	- Source X
sy	- Source Y
width	- Image width
height	- Image height
srcw	- Source buffer width (block aligned)
src	- Source pointer
dx	- Destination X
dy	- Destination Y
destw	- Destination buffer width (block aligned)
dest	- Destination pointer

References x.

sceGuDepthBuffer()

void sceGuDepthBuffer	(	void *	zbp,
		int	zbw
	)

Set depth buffer parameters.

Parameters

zbp	- VRAM pointer where the depthbuffer should start
zbw	- The width of the depth-buffer (block-aligned)

References GuDrawBuffer::depth_buffer, GuDrawBuffer::depth_width, gu_draw_buffer, and x.

sceGuDepthFunc()

void sceGuDepthFunc

(

int

function

)

Select which depth-test function to use.

Valid choices for the depth-test are:

• GU_NEVER - No pixels pass the depth-test
• GU_ALWAYS - All pixels pass the depth-test
• GU_EQUAL - Pixels that match the depth-test pass
• GU_NOTEQUAL - Pixels that doesn't match the depth-test pass
• GU_LESS - Pixels that are less in depth passes
• GU_LEQUAL - Pixels that are less or equal in depth passes
• GU_GREATER - Pixels that are greater in depth passes
• GU_GEQUAL - Pixels that are greater or equal passes

Parameters

function

- Depth test function to use

References x.

sceGuDepthMask()

void sceGuDepthMask

(

int

mask

)

Mask depth buffer writes.

Parameters

mask	- GU_TRUE(1) to disable Z writes, GU_FALSE(0) to enable

sceGuDepthOffset()

void sceGuDepthOffset

(

unsigned int

offset

)

References GuContext::depth_offset, GuContext::far_plane, gu_contexts, gu_curr_context, GuContext::near_plane, sceGuDepthRange(), and x.

sceGuDepthRange()

void sceGuDepthRange	(	int	near,
		int	far
	)

Set which range to use for depth calculations.

Note

The depth buffer is inversed, and takes values from 65535 to 0.

Example: Use the entire depth-range for calculations:

sceGuDepthRange(65535,0);

Parameters

near	- Value to use for the near plane
far	- Value to use for the far plane

References GuContext::depth_offset, GuContext::far_plane, gu_contexts, gu_curr_context, GuContext::near_plane, x, and z.

Referenced by sceGuDepthOffset().

sceGuDisable()

void sceGuDisable

(

int

state

)

Disable GE state.

Look at sceGuEnable() for a list of states

Parameters

state

- Which state to disable

References GuContext::fragment_2x, GU_ALPHA_TEST, GU_BLEND, GU_CLIP_PLANES, GU_COLOR_LOGIC_OP, GU_COLOR_TEST, gu_contexts, GU_CULL_FACE, gu_curr_context, GU_DEPTH_TEST, GU_DITHER, gu_draw_buffer, GU_FACE_NORMAL_REVERSE, GU_FOG, GU_FRAGMENT_2X, GU_LIGHT0, GU_LIGHT1, GU_LIGHT2, GU_LIGHT3, GU_LIGHTING, GU_LINE_SMOOTH, GU_PATCH_CULL_FACE, GU_PATCH_FACE, GU_SCISSOR_TEST, gu_states, GU_STENCIL_TEST, GU_TEXTURE_2D, GuDrawBuffer::height, GuContext::scissor_enable, GuContext::texture_function, and GuDrawBuffer::width.

Referenced by sceGuSetAllStatus(), and sceGuSetStatus().

sceGuDispBuffer()

void sceGuDispBuffer	(	int	width,
		int	height,
		void *	dispbp,
		int	dispbw
	)

Set display buffer parameters.

Example: Setup a standard 16-bit display buffer

sceGuDispBuffer(480,272,(void*)512*272*2,512); // 480*272, skipping the draw buffer located at address 0

Parameters

width	- Width of the display buffer in pixels
height	- Width of the display buffer in pixels
dispbp	- VRAM pointer to where the display-buffer starts
dispbw	- Display buffer width (block aligned)

References GuDrawBuffer::disp_buffer, drawRegion(), GuDrawBuffer::frame_width, ge_edram_address, gu_display_on, gu_draw_buffer, GuDrawBuffer::height, GuDrawBuffer::pixel_size, PSP_DISPLAY_SETBUF_NEXTFRAME, sceDisplaySetFrameBuf(), sceDisplaySetMode(), GuDrawBuffer::width, and x.

sceGuDisplay()

int sceGuDisplay

(

int

state

)

Turn display on or off.

Available states are:

• GU_TRUE (1) - Turns display on
• GU_FALSE (0) - Turns display off

Parameters

state

- Turn display on or off

Returns

State of the display prior to this call

References GuDrawBuffer::disp_buffer, GuDrawBuffer::frame_width, ge_edram_address, gu_display_on, gu_draw_buffer, GuDrawBuffer::pixel_size, PSP_DISPLAY_SETBUF_NEXTFRAME, and sceDisplaySetFrameBuf().

sceGuDrawArray()

void sceGuDrawArray	(	int	prim,
		int	vtype,
		int	count,
		const void *	indices,
		const void *	vertices
	)

Draw array of vertices forming primitives.

Available primitive-types are:

• GU_POINTS - Single pixel points (1 vertex per primitive)
• GU_LINES - Single pixel lines (2 vertices per primitive)
• GU_LINE_STRIP - Single pixel line-strip (2 vertices for the first primitive, 1 for every following)
• GU_TRIANGLES - Filled triangles (3 vertices per primitive)
• GU_TRIANGLE_STRIP - Filled triangles-strip (3 vertices for the first primitive, 1 for every following)
• GU_TRIANGLE_FAN - Filled triangle-fan (3 vertices for the first primitive, 1 for every following)
• GU_SPRITES - Filled blocks (2 vertices per primitive)

The vertex-type decides how the vertices align and what kind of information they contain.
The following flags are ORed together to compose the final vertex format:

• GU_TEXTURE_8BIT - 8-bit texture coordinates
• GU_TEXTURE_16BIT - 16-bit texture coordinates
• GU_TEXTURE_32BITF - 32-bit texture coordinates (float)
• GU_COLOR_5650 - 16-bit color (R5G6B5A0)
• GU_COLOR_5551 - 16-bit color (R5G5B5A1)
• GU_COLOR_4444 - 16-bit color (R4G4B4A4)
• GU_COLOR_8888 - 32-bit color (R8G8B8A8)
• GU_NORMAL_8BIT - 8-bit normals
• GU_NORMAL_16BIT - 16-bit normals
• GU_NORMAL_32BITF - 32-bit normals (float)
• GU_VERTEX_8BIT - 8-bit vertex position
• GU_VERTEX_16BIT - 16-bit vertex position
• GU_VERTEX_32BITF - 32-bit vertex position (float)
• GU_WEIGHT_8BIT - 8-bit weights
• GU_WEIGHT_16BIT - 16-bit weights
• GU_WEIGHT_32BITF - 32-bit weights (float)
• GU_INDEX_8BIT - 8-bit vertex index
• GU_INDEX_16BIT - 16-bit vertex index
• GU_WEIGHTS(n) - Number of weights (1-8)
• GU_VERTICES(n) - Number of vertices (1-8)
• GU_TRANSFORM_2D - Coordinate is passed directly to the rasterizer
• GU_TRANSFORM_3D - Coordinate is transformed before passed to rasterizer

Data members inside a vertex are laid out in the following order:

• Weights - if GU_WEIGHTS(n) is used N weights are present
• Texture Coordinates
• Color
• Normal
• Position

If GU_VERTICES(n) is used the entire vertex structure is repeated N-times.
A member is only present if related type flag has been used (look at examples below).

Note

Every member making up a vertex must be aligned to 16 bits.

Notes on 16 bit vertex/texture/normal formats:

• Values are stored as 16-bit signed integers, with a range of -32768 to 32767
• In the floating point coordinate space this is mapped as -1.0 to 1.0
• To scale this to be such that the value 1 in 16 bit space is 1 unit in floating point space, use sceGumScale() for vertices; (see pspgum.h)
  • You can technically use this to create whatever fixed-point space you want (a common one is 5 bits for the decimals)
  • Caveat: you need to use the sceGumDrawArray method to apply the affine transform to the vertices.
  • sceGuDrawArray() will not apply the affine transform to the vertices.
• To scale this for texture coordinates use sceGuTexOffset() and sceGuTexScale() (see below)
• You can't scale the normals with any functions, which is expected since normals by definition are unit vectors.

sceGumScale(32768.0f, 32768.0f, 32768.0f); // This is an identity mapping -- 1 unit in floating point space is 1 unit in 16-bit space
sceGumDrawArray(GU_TRIANGLES, GU_TEXTURE_32BITF|GU_VERTEX_16BIT, 3, 0, vertices);

Notes on 8 bit vertex/texture/normal formats:

• Values are stored as 8-bit signed integers with a range of -128 to 127
• In the floating point coordinate space this is mapped as -1.0 to 1.0
• To scale this to be such that the value 1 in 8 bit space is 1 unit in floating point space, use sceGumScale() for vertices; (see above).
• The scaling factor as demonstrated will be 128.0f.
• See above for notes on texture and normals.

Example: Render 400 triangles, with floating-point texture coordinates, and floating-point position, no indices

sceGuDrawArray(GU_TRIANGLES,GU_TEXTURE_32BITF|GU_VERTEX_32BITF,400*3,0,vertices);

Parameters

prim	- What kind of primitives to render
vtype	- Vertex type to process
count	- How many vertices to process
indices	- Optional pointer to an index-list
vertices	- Pointer to a vertex-list

References x.

Referenced by sceGuClear().

sceGuDrawArrayN()

void sceGuDrawArrayN	(	int	primitive_type,
		int	vertex_type,
		int	count,
		int	a3,
		const void *	indices,
		const void *	vertices
	)

References a3, i, and x.

sceGuDrawBezier()

void sceGuDrawBezier	(	int	vtype,
		int	ucount,
		int	vcount,
		const void *	indices,
		const void *	vertices
	)

Draw bezier surface.

Parameters

vtype	- Vertex type, look at sceGuDrawArray() for vertex definition
ucount	- Number of vertices used in the U direction
vcount	- Number of vertices used in the V direction
indices	- Pointer to index buffer
vertices	- Pointer to vertex buffer

References x.

sceGuDrawBuffer()

void sceGuDrawBuffer	(	int	psm,
		void *	fbp,
		int	fbw
	)

Set draw buffer parameters (and store in context for buffer-swap)

Available pixel formats are:

• GU_PSM_5650
• GU_PSM_5551
• GU_PSM_4444
• GU_PSM_8888

Example: Setup a standard 16-bit draw buffer

sceGuDrawBuffer(GU_PSM_5551,(void*)0,512);

Parameters

psm	- Pixel format to use for rendering (and display)
fbp	- VRAM pointer to where the draw buffer starts
fbw	- Frame buffer width (block aligned)

References GuDrawBuffer::depth_buffer, GuDrawBuffer::depth_width, GuDrawBuffer::frame_buffer, GuDrawBuffer::frame_width, gu_draw_buffer, GuDrawBuffer::height, GuDrawBuffer::pixel_size, and x.

sceGuDrawBufferList()

void sceGuDrawBufferList	(	int	psm,
		void *	fbp,
		int	fbw
	)

Set draw buffer directly, not storing parameters in the context.

Parameters

psm	- Pixel format to use for rendering
fbp	- VRAM pointer to where the draw buffer starts
fbw	- Frame buffer width (block aligned)

References x.

sceGuDrawSpline()

void sceGuDrawSpline	(	int	vtype,
		int	ucount,
		int	vcount,
		int	uedge,
		int	vedge,
		const void *	indices,
		const void *	vertices
	)

References x.

sceGuEnable()

void sceGuEnable

(

int

state

)

Enable GE state.

The currently available states are:

• GU_ALPHA_TEST
• GU_DEPTH_TEST
• GU_SCISSOR_TEST
• GU_BLEND
• GU_CULL_FACE
• GU_DITHER
• GU_CLIP_PLANES
• GU_TEXTURE_2D
• GU_LIGHTING
• GU_LIGHT0
• GU_LIGHT1
• GU_LIGHT2
• GU_LIGHT3
• GU_COLOR_LOGIC_OP

Parameters

state

- Which state to enable

References GuContext::fragment_2x, GU_ALPHA_TEST, GU_BLEND, GU_CLIP_PLANES, GU_COLOR_LOGIC_OP, GU_COLOR_TEST, gu_contexts, GU_CULL_FACE, gu_curr_context, GU_DEPTH_TEST, GU_DITHER, GU_FACE_NORMAL_REVERSE, GU_FOG, GU_FRAGMENT_2X, GU_LIGHT0, GU_LIGHT1, GU_LIGHT2, GU_LIGHT3, GU_LIGHTING, GU_LINE_SMOOTH, GU_PATCH_CULL_FACE, GU_PATCH_FACE, GU_SCISSOR_TEST, gu_states, GU_STENCIL_TEST, GU_TEXTURE_2D, GuContext::scissor_enable, GuContext::scissor_end, GuContext::scissor_start, and GuContext::texture_function.

Referenced by sceGuSetAllStatus(), and sceGuSetStatus().

sceGuEndObject()

void sceGuEndObject

(

void

)

End conditional rendering of object.

References GuDisplayList::current, gu_list, gu_object_stack, and gu_object_stack_depth.

sceGuFinish()

int sceGuFinish

(

void

)

Finish current display list and go back to the parent context.

If the context is GU_DIRECT, the stall-address is updated so that the entire list will execute. Otherwise, only the terminating action is written to the list, depending on context-type.

The finish-callback will get a zero as argument when using this function.

This also restores control back to whatever context that was active prior to this call.

Returns

Size of finished display list

References GuDisplayList::current, GU_CALL, gu_call_mode, gu_contexts, gu_curr_context, GU_DIRECT, gu_list, GU_SEND, GuContext::list, GuDisplayList::parent_context, size, GuDisplayList::start, and x.

sceGuFinishId()

int sceGuFinishId

(

unsigned int

id

)

Finish current display list and go back to the parent context, sending argument id for the finish callback.

If the context is GU_DIRECT, the stall-address is updated so that the entire list will execute. Otherwise, only the terminating action is written to the list, depending on context-type.

Parameters

id	- Finish callback id (16-bit)

Returns

Size of finished display list

References GuDisplayList::current, GU_CALL, gu_call_mode, gu_contexts, gu_curr_context, GU_DIRECT, gu_list, GU_SEND, GuContext::list, GuDisplayList::parent_context, size, GuDisplayList::start, and x.

sceGuFog()

void sceGuFog	(	float	near,
		float	far,
		unsigned int	color
	)

References x.

sceGuFrontFace()

void sceGuFrontFace

(

int

order

)

Set the current face-order (for culling)

This only has effect when culling is enabled (GU_CULL_FACE)

Culling order can be:

• GU_CW - Clockwise primitives are not culled
• GU_CCW - Counter-clockwise are not culled

Parameters

order

- Which order to use

References x.

sceGuGetAllStatus()

int sceGuGetAllStatus

(

void

)

Query status on all 22 available states.

Look at sceGuEnable() for a list of states

Returns

Status of all 22 states as a bitmask (0-21)

References gu_states.

sceGuGetMemory()

void * sceGuGetMemory

(

int

size

)

Allocate memory on the current display list for temporary storage.

Note

This function is NOT for permanent memory allocation, the memory will be invalid as soon as you start filling the same display list again.

Parameters

size	- How much memory to allocate

Returns

Memory-block ready for use

References GuDisplayList::current, ge_list_executed, gu_curr_context, gu_list, sceGeListUpdateStallAddr(), size, and x.

Referenced by sceGuClear().

sceGuGetStatus()

int sceGuGetStatus

(

int

state

)

Get if state is currently enabled or disabled.

Look at sceGuEnable() for a list of states

Parameters

state

- Which state to query about

Returns

Wether state is enabled or not

References gu_states.

sceGuInit()

void sceGuInit

(

void

)

Initalize the GU system.

This function MUST be called as the first function, otherwise state is undetermined.

References callbackFin(), callbackSig(), PspGeCallbackData::finish_arg, PspGeCallbackData::finish_func, GuSettings::ge_callback_id, ge_edram_address, ge_list_executed, gu_settings, GuSettings::kernel_event_flag, PSP_DISPLAY_SETBUF_IMMEDIATE, resetValues(), sceGeEdramGetAddr(), sceGeListEnQueue(), sceGeListSync(), sceGeSetCallback(), sceKernelCreateEventFlag(), PspGeCallbackData::signal_arg, PspGeCallbackData::signal_func, GuSettings::swapBuffersBehaviour, GuSettings::swapBuffersCallback, and x.

sceGuLight()

void sceGuLight	(	int	light,
		int	type,
		int	components,
		const ScePspFVector3 *	position
	)

Set light parameters.

Available light types are:

• GU_DIRECTIONAL - Directional light
• GU_POINTLIGHT - Single point of light
• GU_SPOTLIGHT - Point-light with a cone

Available light components are:

• GU_AMBIENT_AND_DIFFUSE
• GU_DIFFUSE_AND_SPECULAR
• GU_UNKNOWN_LIGHT_COMPONENT

Parameters

light	- Light index
type	- Light type
components	- Light components
position	- Light position

References light_settings, type, x, ScePspFVector3::x, ScePspFVector3::y, and ScePspFVector3::z.

sceGuLightAtt()

void sceGuLightAtt	(	int	light,
		float	atten0,
		float	atten1,
		float	atten2
	)

Set light attenuation.

Parameters

light	- Light index
atten0	- Constant attenuation factor
atten1	- Linear attenuation factor
atten2	- Quadratic attenuation factor

References light_settings, and x.

sceGuLightColor()

void sceGuLightColor	(	int	light,
		int	component,
		unsigned int	color
	)

Set light color.

Available light components are:

• GU_AMBIENT
• GU_DIFFUSE
• GU_SPECULAR
• GU_AMBIENT_AND_DIFFUSE
• GU_DIFFUSE_AND_SPECULAR

Parameters

light	- Light index
component	- Which component to set
color	- Which color to use

References GU_AMBIENT, GU_AMBIENT_AND_DIFFUSE, GU_DIFFUSE, GU_DIFFUSE_AND_SPECULAR, GU_SPECULAR, light_settings, and x.

sceGuLightMode()

void sceGuLightMode

(

int

mode

)

Set light mode.

Available light modes are:

• GU_SINGLE_COLOR
• GU_SEPARATE_SPECULAR_COLOR

Separate specular colors are used to interpolate the specular component independently, so that it can be added to the fragment after the texture color.

Parameters

mode	- Light mode to use

sceGuLightSpot()

void sceGuLightSpot	(	int	light,
		const ScePspFVector3 *	direction,
		float	exponent,
		float	cutoff
	)

Set spotlight parameters.

Parameters

light	- Light index
direction	- Spotlight direction
exponent	- Spotlight exponent
cutoff	- Spotlight cutoff angle (in radians)

References light_settings, and x.

sceGuLogicalOp()

void sceGuLogicalOp

(

int

op

)

Set color logical operation.

Available operations are:

• GU_CLEAR
• GU_AND
• GU_AND_REVERSE
• GU_COPY
• GU_AND_INVERTED
• GU_NOOP
• GU_XOR
• GU_OR
• GU_NOR
• GU_EQUIV
• GU_INVERTED
• GU_OR_REVERSE
• GU_COPY_INVERTED
• GU_OR_INVERTED
• GU_NAND
• GU_SET

This operation only has effect if GU_COLOR_LOGIC_OP is enabled.

Parameters

op	- Operation to execute

References x.

sceGuMaterial()

void sceGuMaterial	(	int	mode,
		int	color
	)

References x.

Referenced by sceGuColor().

sceGuModelColor()

void sceGuModelColor	(	unsigned int	emissive,
		unsigned int	ambient,
		unsigned int	diffuse,
		unsigned int	specular
	)

References x.

sceGuMorphWeight()

void sceGuMorphWeight	(	int	index,
		float	weight
	)

Specify morph weight entry.

To enable vertex morphing, pass GU_VERTICES(n), where n is between 1-8. This will change the amount of vertices passed in the vertex array, and by setting the morph weights for every vertex entry in the array, you can blend between them.

Please see sceGuDrawArray() for vertex format information.

Parameters

index	- Morph weight index (0-7)
weight	- Weight to set

References x.

sceGuOffset()

void sceGuOffset	(	unsigned int	x,
		unsigned int	y
	)

Set virtual coordinate offset.

The PSP has a virtual coordinate-space of 4096x4096, this controls where rendering is performed

Example: Center the virtual coordinate range

sceGuOffset(2048-(480/2),2048-(480/2));

Parameters

x	- Offset (0-4095)
y	- Offset (0-4095)

References x, and y.

sceGuPatchDivide()

void sceGuPatchDivide	(	unsigned int	ulevel,
		unsigned int	vlevel
	)

Set dividing for patches (beziers and splines)

Parameters

ulevel	- Number of division on u direction
vlevel	- Number of division on v direction

References a0, and a1.

Referenced by sceGuStart().

sceGuPatchFrontFace()

void sceGuPatchFrontFace

(

unsigned int

a0

)

References a0.

sceGuPatchPrim()

void sceGuPatchPrim

(

int

prim

)

Set primitive for patches (beziers and splines)

Parameters

prim	- Desired primitive type (GU_POINTS | GU_LINE_STRIP | GU_TRIANGLE_STRIP)

References GU_LINE_STRIP, GU_POINTS, GU_TRIANGLE_STRIP, and x.

sceGuPixelMask()

void sceGuPixelMask

(

unsigned int

mask

)

Set mask for which bits of the pixels to write.

Parameters

mask	- Which bits to filter against writes

sceGuScissor()

void sceGuScissor	(	int	x,
		int	y,
		int	w,
		int	h
	)

Set what to scissor within the current viewport.

Note that scissoring is only performed if the custom scissoring is enabled (GU_SCISSOR_TEST)

Parameters

x	- Left of scissor region
y	- Top of scissor region
w	- Width of scissor region
h	- Height of scissor region

References gu_contexts, gu_curr_context, GuContext::scissor_enable, GuContext::scissor_end, GuContext::scissor_start, w, x, and y.

sceGuSendCommandf()

void sceGuSendCommandf	(	int	cmd,
		float	argument
	)

Send raw float-command to the GE.

The argument is converted into a 24-bit float before transfer.

Parameters

cmd	- Which command to send
argument	- Argument to pass along

References x.

sceGuSendCommandi()

void sceGuSendCommandi	(	int	cmd,
		int	argument
	)

Send raw command to the GE.

Only the 24 lower bits of the argument is passed along.

Parameters

cmd	- Which command to send
argument	- Argument to pass along

References x.

sceGuSendList()

void sceGuSendList	(	int	mode,
		const void *	list,
		PspGeContext *	context
	)

Send a list to the GE directly.

Available modes are:

• GU_TAIL - Place list last in the queue, so it executes in-order
• GU_HEAD - Place list first in queue so that it executes as soon as possible

Parameters

mode	- Whether to place the list first or last in queue
list	- List to send
context	- Temporary storage for the GE context

References PspGeListArgs::context, GuSettings::ge_callback_id, ge_list_executed, GU_HEAD, gu_settings, GU_TAIL, sceGeListEnQueue(), sceGeListEnQueueHead(), GuSettings::signal_offset, PspGeListArgs::size, and x.

sceGuSetAllStatus()

void sceGuSetAllStatus

(

int

status

)

Set the status on all 22 available states.

Look at sceGuEnable() for a list of states

Parameters

status

- Bit-mask (0-21) containing the status of all 22 states

References i, sceGuDisable(), and sceGuEnable().

sceGuSetCallback()

void * sceGuSetCallback	(	int	signal,
		void(*)(int)	callback
	)

Setup signal handler.

Available signals are:

• GU_CALLBACK_SIGNAL - Called when sceGuSignal is used
• GU_CALLBACK_FINISH - Called when display list is finished

Parameters

signal	- Signal index to install a handler for
callback	- Callback to call when signal index is triggered

Returns

The old callback handler

References GuSettings::fin, GU_CALLBACK_FINISH, GU_CALLBACK_SIGNAL, gu_settings, GuSettings::sig, and x.

sceGuSetDither()

void sceGuSetDither

(

const ScePspIMatrix4 *

matrix

)

Set ordered pixel dither matrix.

This dither matrix is only applied if GU_DITHER is enabled.

Parameters

matrix

- Dither matrix

References x.

Referenced by sceGuStart().

sceGuSetMatrix()

void sceGuSetMatrix	(	int	type,
		const ScePspFMatrix4 *	matrix
	)

Set transform matrices.

Available matrices are:

• GU_PROJECTION - View->Projection matrix
• GU_VIEW - World->View matrix
• GU_MODEL - Model->World matrix
• GU_TEXTURE - Texture matrix

Parameters

type	- Which matrix-type to set
matrix	- Matrix to load

References i, type, and x.

sceGuSetStatus()

void sceGuSetStatus	(	int	state,
		int	status
	)

Enable or disable GE state.

Look at sceGuEnable() for a list of states

Parameters

state	- Which state to change
status	- Wether to enable or disable the state

References sceGuDisable(), and sceGuEnable().

sceGuShadeModel()

void sceGuShadeModel

(

int

mode

)

Set how primitives are shaded.

The available shading-methods are:

• GU_FLAT - Primitives are flatshaded, the last vertex-color takes effet
• GU_SMOOTH - Primtives are gouraud-shaded, all vertex-colors take effect

Parameters

mode	- Which mode to use

sceGuSignal()

void sceGuSignal	(	int	signal,
		int	behavior
	)

Trigger signal to call code from the command stream.

Available behaviors are:

• GU_BEHAVIOR_SUSPEND - Stops display list execution until callback function finished
• GU_BEHAVIOR_CONTINUE - Do not stop display list execution during callback

Parameters

signal	- Signal to trigger
behavior	- Behavior type

References x.

sceGuSpecular()

void sceGuSpecular

(

float

power

)

Set the specular power for the material.

Parameters

power

- Specular power

References x.

Referenced by sceGuStart().

sceGuStart()

void sceGuStart	(	int	cid,
		void *	list
	)

Start filling a new display-context.

Contexts available are:

• GU_DIRECT - Rendering is performed as list is filled
• GU_CALL - List is setup to be called from the main list
• GU_SEND - List is buffered for a later call to sceGuSendList()

The previous context-type is stored so that it can be restored at sceGuFinish().

Parameters

cid	- Context Type
list	- Pointer to display-list (16 byte aligned)

References GuDisplayList::current, GuDrawBuffer::frame_buffer, GuDrawBuffer::frame_width, GuSettings::ge_callback_id, ge_list_executed, GU_AMBIENT, gu_contexts, gu_curr_context, GU_DIFFUSE, gu_draw_buffer, gu_init, gu_list, gu_settings, GU_SPECULAR, GuContext::list, GuDisplayList::parent_context, sceGeListEnQueue(), sceGuColorMaterial(), sceGuPatchDivide(), sceGuSetDither(), sceGuSpecular(), sceGuTexScale(), GuSettings::signal_offset, GuDisplayList::start, and x.

sceGuStencilFunc()

void sceGuStencilFunc	(	int	func,
		int	ref,
		int	mask
	)

Set stencil function and reference value for stencil testing.

Available functions are:

• GU_NEVER
• GU_ALWAYS
• GU_EQUAL
• GU_NOTEQUAL
• GU_LESS
• GU_LEQUAL
• GU_GREATER
• GU_GEQUAL

Parameters

func	- Test function
ref	- The reference value for the stencil test
mask	- Mask that is ANDed with both the reference value and stored stencil value when the test is done

References x.

sceGuStencilOp()

void sceGuStencilOp	(	int	fail,
		int	zfail,
		int	zpass
	)

Set the stencil test actions.

Available actions are:

• GU_KEEP - Keeps the current value
• GU_ZERO - Sets the stencil buffer value to zero
• GU_REPLACE - Sets the stencil buffer value to ref, as specified by sceGuStencilFunc()
• GU_INCR - Increments the current stencil buffer value
• GU_DECR - Decrease the current stencil buffer value
• GU_INVERT - Bitwise invert the current stencil buffer value

As stencil buffer shares memory with framebuffer alpha, resolution of the buffer is directly in relation.

Parameters

fail	- The action to take when the stencil test fails
zfail	- The action to take when stencil test passes, but the depth test fails
zpass	- The action to take when both stencil test and depth test passes

References x.

sceGuSwapBuffers()

void * sceGuSwapBuffers

(

void

)

Swap display and draw buffer.

Returns

Pointer to the new drawbuffer

References GuDrawBuffer::disp_buffer, GuDrawBuffer::frame_buffer, GuDrawBuffer::frame_width, ge_edram_address, gu_current_frame, gu_display_on, gu_draw_buffer, gu_settings, GuDrawBuffer::pixel_size, sceDisplaySetFrameBuf(), GuSettings::swapBuffersBehaviour, GuSettings::swapBuffersCallback, and x.

sceGuSync()

int sceGuSync	(	int	mode,
		int	what
	)

Wait until display list has finished executing.

Example: Wait for the currently executing display list

sceGuSync(0,0);

Available what are:

• GU_SYNC_WHAT_DONE
• GU_SYNC_WHAT_QUEUED
• GU_SYNC_WHAT_DRAW
• GU_SYNC_WHAT_STALL
• GU_SYNC_WHAT_CANCEL

Available mode are:

• GU_SYNC_FINISH - Wait until the last sceGuFinish command is reached
• GU_SYNC_SIGNAL - Wait until the last (?) signal is executed
• GU_SYNC_DONE - Wait until all commands currently in list are executed
• GU_SYNC_LIST - Wait for the currently executed display list (GU_DIRECT)
• GU_SYNC_SEND - Wait for the last send list

Parameters

mode	- What to wait for
what	- What to sync to

Returns

Unknown at this time

References ge_list_executed, sceGeDrawSync(), sceGeListSync(), and x.

sceGuTerm()

void sceGuTerm

(

void

)

Shutdown the GU system.

Called when GU is no longer needed

References GuSettings::ge_callback_id, gu_settings, GuSettings::kernel_event_flag, sceGeUnsetCallback(), and sceKernelDeleteEventFlag().

sceGuTexEnvColor()

void sceGuTexEnvColor

(

unsigned int

color

)

Specify the texture environment color.

This is used in the texture function when a constant color is needed.

See sceGuTexFunc() for more information.

Parameters

color

- Constant color (0x00BBGGRR)

References x.

sceGuTexFilter()

void sceGuTexFilter	(	int	min,
		int	mag
	)

Set how the texture is filtered.

Available filters are:

• GU_NEAREST
• GU_LINEAR
• GU_NEAREST_MIPMAP_NEAREST
• GU_LINEAR_MIPMAP_NEAREST
• GU_NEAREST_MIPMAP_LINEAR
• GU_LINEAR_MIPMAP_LINEAR

Parameters

min	- Minimizing filter
mag	- Magnifying filter

References x.

sceGuTexFlush()

void sceGuTexFlush

(

void

)

Flush texture page-cache.

Do this if you have copied/rendered into an area currently in the texture-cache

Referenced by sceGuTexImage(), and sceGuTexMode().

sceGuTexFunc()

void sceGuTexFunc	(	int	tfx,
		int	tcc
	)

Set how textures are applied.

Key for the apply-modes:

• Cv - Color value result
• Ct - Texture color
• Cf - Fragment color
• Cc - Constant color (specified by sceGuTexEnvColor())

Available apply-modes are: (TFX)

• GU_TFX_MODULATE - Cv=Ct*Cf TCC_RGB: Av=Af TCC_RGBA: Av=At*Af
• GU_TFX_DECAL - TCC_RGB: Cv=Ct,Av=Af TCC_RGBA: Cv=Cf*(1-At)+Ct*At Av=Af
• GU_TFX_BLEND - Cv=(Cf*(1-Ct))+(Cc*Ct) TCC_RGB: Av=Af TCC_RGBA: Av=At*Af
• GU_TFX_REPLACE - Cv=Ct TCC_RGB: Av=Af TCC_RGBA: Av=At
• GU_TFX_ADD - Cv=Cf+Ct TCC_RGB: Av=Af TCC_RGBA: Av=At*Af

The fields TCC_RGB and TCC_RGBA specify components that differ between the two different component modes.

• GU_TFX_MODULATE - The texture is multiplied with the current diffuse fragment
• GU_TFX_REPLACE - The texture replaces the fragment
• GU_TFX_ADD - The texture is added on-top of the diffuse fragment

Available component-modes are: (TCC)

• GU_TCC_RGB - The texture alpha does not have any effect
• GU_TCC_RGBA - The texture alpha is taken into account

Parameters

tfx	- Which apply-mode to use
tcc	- Which component-mode to use

References GuContext::fragment_2x, gu_contexts, gu_curr_context, GuContext::texture_function, and x.

sceGuTexImage()

void sceGuTexImage	(	int	mipmap,
		int	width,
		int	height,
		int	tbw,
		const void *	tbp
	)

Set current texturemap.

Textures may reside in main RAM, but it has a huge speed-penalty. Swizzle textures to get maximum speed.

Note

Data must be aligned to 1 quad word (16 bytes)

Parameters

mipmap	- Mipmap level
width	- Width of texture (must be a power of 2)
height	- Height of texture (must be a power of 2)
tbw	- Texture Buffer Width (block-aligned)
tbp	- Texture buffer pointer (16 byte aligned)

References getExp(), sceGuTexFlush(), and x.

sceGuTexLevelMode()

void sceGuTexLevelMode	(	unsigned int	mode,
		float	bias
	)

Set texture-level mode (mipmapping)

Available modes are:

• GU_TEXTURE_AUTO
• GU_TEXTURE_CONST
• GU_TEXTURE_SLOPE

Parameters

mode	- Which mode to use
bias	- Which mipmap bias to use

References x.

sceGuTexMapMode()

void sceGuTexMapMode	(	int	mode,
		unsigned int	a1,
		unsigned int	a2
	)

Set the texture-mapping mode.

Available modes are:

• GU_TEXTURE_COORDS
• GU_TEXTURE_MATRIX
• GU_ENVIRONMENT_MAP

Parameters

mode	- Which mode to use
a1	- Unknown
a2	- Unknown

References a1, a2, gu_contexts, gu_curr_context, GuContext::texture_map_mode, and GuContext::texture_proj_map_mode.

sceGuTexMode()

void sceGuTexMode	(	int	tpsm,
		int	maxmips,
		int	a2,
		int	swizzle
	)

Set texture-mode parameters.

Available texture-formats are:

• GU_PSM_5650 - Hicolor, 16-bit
• GU_PSM_5551 - Hicolor, 16-bit
• GU_PSM_4444 - Hicolor, 16-bit
• GU_PSM_8888 - Truecolor, 32-bit
• GU_PSM_T4 - Indexed, 4-bit (2 pixels per byte)
• GU_PSM_T8 - Indexed, 8-bit

Parameters

tpsm	- Which texture format to use
maxmips	- Number of mipmaps to use (0-8)
a2	- Unknown, set to 0
swizzle	- GU_TRUE(1) to swizzle texture-reads

References a2, gu_contexts, gu_curr_context, sceGuTexFlush(), GuContext::texture_mode, and x.

sceGuTexOffset()

void sceGuTexOffset	(	float	u,
		float	v
	)

Set texture offset.

Note

Only used by the 3D T&L pipe, renders done with GU_TRANSFORM_2D are not affected by this.

Parameters

u	- Offset to add to the U coordinate
v	- Offset to add to the V coordinate

References x.

sceGuTexProjMapMode()

void sceGuTexProjMapMode

(

int

mode

)

Set texture projection-map mode.

Available modes are:

• GU_POSITION
• GU_UV
• GU_NORMALIZED_NORMAL
• GU_NORMAL

Parameters

mode	- Which mode to use

References gu_contexts, gu_curr_context, GuContext::texture_map_mode, and GuContext::texture_proj_map_mode.

sceGuTexScale()

void sceGuTexScale	(	float	u,
		float	v
	)

Set texture scale.

Note

Only used by the 3D T&L pipe, renders ton with GU_TRANSFORM_2D are not affected by this.

Parameters

u	- Scalar to multiply U coordinate with
v	- Scalar to multiply V coordinate with

References x.

Referenced by sceGuStart().

sceGuTexSlope()

void sceGuTexSlope

(

float

slope

)

References x.

sceGuTexSync()

void sceGuTexSync

(

)

Synchronize rendering pipeline with image upload.

This will stall the rendering pipeline until the current image upload initiated by sceGuCopyImage() has completed.

sceGuTexWrap()

void sceGuTexWrap	(	int	u,
		int	v
	)

Set if the texture should repeat or clamp.

Available modes are:

• GU_REPEAT - The texture repeats after crossing the border
• GU_CLAMP - Texture clamps at the border

Parameters

u	- Wrap-mode for the U direction
v	- Wrap-mode for the V direction

References x.

sceGuViewport()

void sceGuViewport	(	int	cx,
		int	cy,
		int	width,
		int	height
	)

Set current viewport.

Example: Setup a viewport of size (480,272) with origo at (2048,2048)

sceGuViewport(2048,2048,480,272);

Parameters

cx	- Center for horizontal viewport
cy	- Center for vertical viewport
width	- Width of viewport
height	- Height of viewport

References x.