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mesa: Add a helper function for shared code in get_tex_rgba_{un}compressed 

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Anuj Phogat 2015-12-28 10:46:51 -08:00
parent 5e2d25894b
commit 46c8967813
1 changed files with 38 additions and 45 deletions
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83
src/mesa/main/texgetimage.c
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@ -265,6 +265,40 @@ get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
}
}
/**
* Depending on the base format involved we may need to apply a rebase
* transform (for example: if we download to a Luminance format we want
* G=0 and B=0).
*/
static bool
teximage_needs_rebase(mesa_format texFormat, GLenum baseFormat,
bool is_compressed, uint8_t *rebaseSwizzle)
{
bool needsRebase = false;
if (baseFormat == GL_LUMINANCE ||
baseFormat == GL_INTENSITY) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
} else if (baseFormat == GL_LUMINANCE_ALPHA) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_W;
} else if (!is_compressed &&
(baseFormat != _mesa_get_format_base_format(texFormat))) {
needsRebase =
_mesa_compute_rgba2base2rgba_component_mapping(baseFormat,
rebaseSwizzle);
}
return needsRebase;
}
/**
* Get a color texture image with decompression.
@ -319,26 +353,8 @@ get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions,
}
}
/* Depending on the base format involved we may need to apply a rebase
* transform (for example: if we download to a Luminance format we want
* G=0 and B=0).
*/
if (baseFormat == GL_LUMINANCE ||
baseFormat == GL_INTENSITY) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
} else if (baseFormat == GL_LUMINANCE_ALPHA) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_W;
} else {
needsRebase = false;
}
needsRebase = teximage_needs_rebase(texFormat, baseFormat, true,
rebaseSwizzle);
srcStride = 4 * width * sizeof(GLfloat);
dstStride = _mesa_image_row_stride(&ctx->Pack, width, format, type);
@ -423,31 +439,8 @@ get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions,
bool needsRebase;
void *rgba = NULL;
/* Depending on the base format involved we may need to apply a rebase
* transform (for example: if we download to a Luminance format we want
* G=0 and B=0).
*/
if (texImage->_BaseFormat == GL_LUMINANCE ||
texImage->_BaseFormat == GL_INTENSITY) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
} else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
needsRebase = true;
rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_W;
} else if (texImage->_BaseFormat !=
_mesa_get_format_base_format(texFormat)) {
needsRebase =
_mesa_compute_rgba2base2rgba_component_mapping(texImage->_BaseFormat,
rebaseSwizzle);
} else {
needsRebase = false;
}
needsRebase = teximage_needs_rebase(texFormat, texImage->_BaseFormat, false,
rebaseSwizzle);
/* Describe the dst format */
dst_is_integer = _mesa_is_enum_format_integer(format);