/**
* Initialize texture state for the given context.
*/
GLboolean
_mesa_init_texture(struct gl_context *ctx)
{
GLuint u;
/* Texture group */
ctx->Texture.CurrentUnit = 0; /* multitexture */
/* Appendix F.2 of the OpenGL ES 3.0 spec says:
*
* "OpenGL ES 3.0 requires that all cube map filtering be
* seamless. OpenGL ES 2.0 specified that a single cube map face be
* selected and used for filtering."
*
* Unfortunatley, a call to _mesa_is_gles3 below will only work if
* the driver has already computed and set ctx->Version, however drivers
* seem to call _mesa_initialize_context (which calls this) early
* in the CreateContext hook and _mesa_compute_version much later (since
* it needs information about available extensions). So, we will
* enable seamless cubemaps by default since GLES2. This should work
* for most implementations and drivers that don't support seamless
* cubemaps for GLES2 can still disable it.
*/
ctx->Texture.CubeMapSeamless = ctx->API == API_OPENGLES2;
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++)
init_texture_unit(ctx, u);
/* After we're done initializing the context's texture state the default
* texture objects' refcounts should be at least
* MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
*/
assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
>= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1);
/* Allocate proxy textures */
if (!alloc_proxy_textures( ctx ))
return GL_FALSE;
/* GL_ARB_texture_buffer_object */
_mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject,
ctx->Shared->NullBufferObj);
ctx->Texture.NumCurrentTexUsed = 0;
return GL_TRUE;
}
/**
* Initialize texture state for the given context.
*/
GLboolean
_mesa_init_texture(struct gl_context *ctx)
{
GLuint u;
/* Texture group */
ctx->Texture.CurrentUnit = 0; /* multitexture */
/* Appendix F.2 of the OpenGL ES 3.0 spec says:
*
* "OpenGL ES 3.0 requires that all cube map filtering be
* seamless. OpenGL ES 2.0 specified that a single cube map face be
* selected and used for filtering."
*
* Unfortunatley, a call to _mesa_is_gles3 below will only work if
* the driver has already computed and set ctx->Version, however drivers
* seem to call _mesa_initialize_context (which calls this) early
* in the CreateContext hook and _mesa_compute_version much later (since
* it needs information about available extensions). So, we will
* enable seamless cubemaps by default since GLES2. This should work
* for most implementations and drivers that don't support seamless
* cubemaps for GLES2 can still disable it.
*/
ctx->Texture.CubeMapSeamless = ctx->API == API_OPENGLES2;
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) {
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
GLuint tex;
/* initialize current texture object ptrs to the shared default objects */
for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
_mesa_reference_texobj(&texUnit->CurrentTex[tex],
ctx->Shared->DefaultTex[tex]);
}
texUnit->_BoundTextures = 0;
}
for (u = 0; u < ARRAY_SIZE(ctx->Texture.FixedFuncUnit); u++) {
struct gl_fixedfunc_texture_unit *texUnit =
&ctx->Texture.FixedFuncUnit[u];
texUnit->EnvMode = GL_MODULATE;
ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
texUnit->Combine = default_combine_state;
texUnit->_EnvMode = default_combine_state;
texUnit->_CurrentCombine = & texUnit->_EnvMode;
texUnit->TexGenEnabled = 0x0;
texUnit->GenS.Mode = GL_EYE_LINEAR;
texUnit->GenT.Mode = GL_EYE_LINEAR;
texUnit->GenR.Mode = GL_EYE_LINEAR;
texUnit->GenQ.Mode = GL_EYE_LINEAR;
texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR;
texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR;
texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR;
texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR;
/* Yes, these plane coefficients are correct! */
ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
}
/* After we're done initializing the context's texture state the default
* texture objects' refcounts should be at least
* MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
*/
assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
>= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1);
/* Allocate proxy textures */
if (!alloc_proxy_textures( ctx ))
return GL_FALSE;
/* GL_ARB_texture_buffer_object */
_mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject,
ctx->Shared->NullBufferObj);
ctx->Texture.NumCurrentTexUsed = 0;
return GL_TRUE;
}
