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mesa: add texture_view helper function for TexStorage

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Add helper function to set texture_view state from TexStorage calls.
Include review feedback.

Signed-off-by: Courtney Goeltzenleuchter <courtney@LunarG.com>

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Courtney Goeltzenleuchter
2013-11-06 14:40:31 -07:00
committed by Brian Paul
parent f07ca59839
commit 1db4cb841b
2 changed files with 65 additions and 0 deletions
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src/mesa/main/textureview.c
+61
View File
@@ -346,6 +346,67 @@ compatible_format(struct gl_context *ctx, const struct gl_texture_object *origTe
_mesa_lookup_enum_by_nr(origInternalFormat));
return false;
}
/**
* Helper function for TexStorage and teximagemultisample to set immutable
* texture state needed by ARB_texture_view.
*/
void
_mesa_set_texture_view_state(struct gl_context *ctx,
struct gl_texture_object *texObj,
GLenum target, GLuint levels)
{
struct gl_texture_image *texImage;
/* Get a reference to what will become this View's base level */
texImage = _mesa_select_tex_image(ctx, texObj, target, 0);
/* When an immutable texture is created via glTexStorage or glTexImageMultisample,
* TEXTURE_IMMUTABLE_FORMAT becomes TRUE.
* TEXTURE_IMMUTABLE_LEVELS and TEXTURE_VIEW_NUM_LEVELS become levels.
* If the texture target is TEXTURE_1D_ARRAY then
* TEXTURE_VIEW_NUM_LAYERS becomes height.
* If the texture target is TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY,
* or TEXTURE_2D_MULTISAMPLE_ARRAY then TEXTURE_VIEW_NUM_LAYERS becomes depth.
* If the texture target is TEXTURE_CUBE_MAP, then
* TEXTURE_VIEW_NUM_LAYERS becomes 6.
* For any other texture target, TEXTURE_VIEW_NUM_LAYERS becomes 1.
*
* ARB_texture_multisample: Multisample textures do
* not have multiple image levels.
*/
texObj->Immutable = GL_TRUE;
texObj->ImmutableLevels = levels;
texObj->MinLevel = 0;
texObj->NumLevels = levels;
texObj->MinLayer = 0;
texObj->NumLayers = 1;
switch (target) {
case GL_TEXTURE_1D_ARRAY:
texObj->NumLayers = texImage->Height;
break;
case GL_TEXTURE_2D_MULTISAMPLE:
texObj->NumLevels = 1;
texObj->ImmutableLevels = 1;
break;
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
texObj->NumLevels = 1;
texObj->ImmutableLevels = 1;
/* fall through to set NumLayers */
case GL_TEXTURE_2D_ARRAY:
case GL_TEXTURE_CUBE_MAP_ARRAY:
texObj->NumLayers = texImage->Depth;
break;
case GL_TEXTURE_CUBE_MAP:
texObj->NumLayers = 6;
break;
}
}
/**
* glTextureView (ARB_texture_view)
src/mesa/main/textureview.h
+4
View File
@@ -36,4 +36,8 @@ _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
GLuint minlevel, GLuint numlevels,
GLuint minlayer, GLuint numlayers);
extern void
_mesa_set_texture_view_state(struct gl_context *ctx, struct gl_texture_object *texObj,
GLenum target, GLuint levels);
#endif /* TEXTUREVIEW_H */