texstate.c File Reference

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Detailed Description

Texture state handling.

#include "glheader.h"
#include "mfeatures.h"
#include "colormac.h"
#include "colortab.h"
#include "context.h"
#include "enums.h"
#include "macros.h"
#include "texcompress.h"
#include "texobj.h"
#include "teximage.h"
#include "texstate.h"
#include "texenvprogram.h"
#include "mtypes.h"

Functions
void	_mesa_copy_texture_state (const GLcontext *src, GLcontext *dst)
	Used by glXCopyContext to copy texture state from one context to another.
void	_mesa_print_texunit_state (GLcontext *ctx, GLuint unit)
static void	calculate_derived_texenv (struct gl_tex_env_combine_state *state, GLenum mode, GLenum texBaseFormat)
	Convert "classic" texture environment to ARB_texture_env_combine style environments.
void GLAPIENTRY	_mesa_ActiveTextureARB (GLenum texture)
void GLAPIENTRY	_mesa_ClientActiveTextureARB (GLenum texture)
static void	update_texture_matrices (GLcontext *ctx)
	Note: This routine refers to derived texture attribute values to compute the ENABLE_TEXMAT flags, but is only called on _NEW_TEXTURE_MATRIX.
static void	update_tex_combine (GLcontext *ctx, struct gl_texture_unit *texUnit)
	Examine texture unit's combine/env state to update derived state.
static void	update_texture_state (GLcontext *ctx)
	Note: This routine refers to derived texture matrix values to compute the ENABLE_TEXMAT flags, but is only called on _NEW_TEXTURE.
void	_mesa_update_texture (GLcontext *ctx, GLuint new_state)
	Update texture-related derived state.
static GLboolean	alloc_proxy_textures (GLcontext *ctx)
	Allocate the proxy textures for the given context.
static void	init_texture_unit (GLcontext *ctx, GLuint unit)
	Initialize a texture unit.
GLboolean	_mesa_init_texture (GLcontext *ctx)
	Initialize texture state for the given context.
void	_mesa_free_texture_data (GLcontext *ctx)
	Free dynamically-allocted texture data attached to the given context.
void	_mesa_update_default_objects_texture (GLcontext *ctx)
	Update the default texture objects in the given context to reference those specified in the shared state and release those referencing the old shared state.
Variables
static struct gl_tex_env_combine_state	default_combine_state
	Default texture combine environment state.

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Function Documentation

void GLAPIENTRY _mesa_ActiveTextureARB

(

GLenum

texture

)

void GLAPIENTRY _mesa_ClientActiveTextureARB

(

GLenum

texture

)

void _mesa_copy_texture_state	(	const GLcontext *	src,
		GLcontext *	dst
	)

Used by glXCopyContext to copy texture state from one context to another.

void _mesa_free_texture_data

(

GLcontext *

ctx

)

Free dynamically-allocted texture data attached to the given context.

GLboolean _mesa_init_texture

(

GLcontext *

ctx

)

Initialize texture state for the given context.

void _mesa_print_texunit_state	(	GLcontext *	ctx,
		GLuint	unit
	)

void _mesa_update_default_objects_texture

(

GLcontext *

ctx

)

Update the default texture objects in the given context to reference those specified in the shared state and release those referencing the old shared state.

void _mesa_update_texture	(	GLcontext *	ctx,
		GLuint	new_state
	)

Update texture-related derived state.

static GLboolean alloc_proxy_textures

(

GLcontext *

ctx

)

[static]

Allocate the proxy textures for the given context.

Parameters:

ctx

the context to allocate proxies for.

Returns:

GL_TRUE on success, or GL_FALSE on failure

If run out of memory part way through the allocations, clean up and return GL_FALSE.

static void calculate_derived_texenv	(	struct gl_tex_env_combine_state *	state,
		GLenum	mode,
		GLenum	texBaseFormat
	)			[static]

Convert "classic" texture environment to ARB_texture_env_combine style environments.

Parameters:

	state	texture_env_combine state vector to be filled-in.
	mode	Classic texture environment mode (i.e., GL_REPLACE, GL_BLEND, GL_DECAL, etc.).
	texBaseFormat	Base format of the texture associated with the texture unit.

static void init_texture_unit	(	GLcontext *	ctx,
		GLuint	unit
	)			[static]

Initialize a texture unit.

Parameters:

	ctx	GL context.
	unit	texture unit number to be initialized.

static void update_tex_combine	(	GLcontext *	ctx,
		struct gl_texture_unit *	texUnit
	)			[static]

Examine texture unit's combine/env state to update derived state.

static void update_texture_matrices

(

GLcontext *

ctx

)

[static]

Note:

This routine refers to derived texture attribute values to compute the ENABLE_TEXMAT flags, but is only called on _NEW_TEXTURE_MATRIX.

On changes to _NEW_TEXTURE, the ENABLE_TEXMAT flags are updated by _mesa_update_textures(), below.

Parameters:

ctx

GL context.

static void update_texture_state

(

GLcontext *

ctx

)

[static]

Note:

This routine refers to derived texture matrix values to compute the ENABLE_TEXMAT flags, but is only called on _NEW_TEXTURE.

On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT flags are updated by _mesa_update_texture_matrices, above.

Parameters:

ctx

GL context.

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Variable Documentation

struct gl_tex_env_combine_state default_combine_state [static]

Initial value:

 {
   GL_MODULATE, GL_MODULATE,
   { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
   { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
   { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA },
   { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
   0, 0,
   2, 2
}

Default texture combine environment state.

This is used to initialize a context's texture units and as the basis for converting "classic" texture environmnets to ARB_texture_env_combine style values.

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