diff options
Diffstat (limited to 'src/mesa')
-rw-r--r-- | src/mesa/main/texgetimage.c | 73 |
1 files changed, 34 insertions, 39 deletions
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c index 789b6f82afc..e45a45ad5f8 100644 --- a/src/mesa/main/texgetimage.c +++ b/src/mesa/main/texgetimage.c @@ -242,13 +242,15 @@ get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions, const mesa_format texFormat = _mesa_get_srgb_format_linear(texImage->TexFormat); const GLenum baseFormat = _mesa_get_format_base_format(texFormat); - const GLenum destBaseFormat = _mesa_base_tex_format(ctx, format); - GLenum rebaseFormat = GL_NONE; const GLuint width = texImage->Width; const GLuint height = texImage->Height; const GLuint depth = texImage->Depth; - GLfloat *tempImage, *tempSlice, *srcRow; - GLuint row, slice; + GLfloat *tempImage, *tempSlice; + GLuint slice; + int srcStride, dstStride; + uint32_t dstFormat; + bool needsRebase; + uint8_t rebaseSwizzle[4]; /* Decompress into temp float buffer, then pack into user buffer */ tempImage = malloc(width * height * depth @@ -282,46 +284,39 @@ get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions, } } + /* Depending on the base format involved we may need to apply a rebase + * tranaform (for example: if we download to a Luminance format we want + * G=0 and B=0). + */ if (baseFormat == GL_LUMINANCE || - baseFormat == GL_INTENSITY || - baseFormat == GL_LUMINANCE_ALPHA) { - /* If a luminance (or intensity) texture is read back as RGB(A), the - * returned value should be (L,0,0,1), not (L,L,L,1). Set rebaseFormat - * here to get G=B=0. - */ - rebaseFormat = texImage->_BaseFormat; - } - else if ((baseFormat == GL_RGBA || - baseFormat == GL_RGB || - baseFormat == GL_RG) && - (destBaseFormat == GL_LUMINANCE || - destBaseFormat == GL_LUMINANCE_ALPHA || - destBaseFormat == GL_LUMINANCE_INTEGER_EXT || - destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) { - /* If we're reading back an RGB(A) texture as luminance then we need - * to return L=tex(R). Note, that's different from glReadPixels which - * returns L=R+G+B. - */ - rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */ - } - - if (rebaseFormat) { - _mesa_rebase_rgba_float(width * height, (GLfloat (*)[4]) tempImage, - rebaseFormat); + 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; } + srcStride = 4 * width * sizeof(GLfloat); + dstStride = _mesa_image_row_stride(&ctx->Pack, width, format, type); + dstFormat = _mesa_format_from_format_and_type(format, type); tempSlice = tempImage; for (slice = 0; slice < depth; slice++) { - srcRow = tempSlice; - for (row = 0; row < height; row++) { - void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels, - width, height, format, type, - slice, row, 0); - - _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) srcRow, - format, type, dest, &ctx->Pack, transferOps); - srcRow += 4 * width; - } + void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels, + width, height, format, type, + slice, 0, 0); + _mesa_format_convert(dest, dstFormat, dstStride, + tempSlice, RGBA8888_FLOAT, srcStride, + width, height, + needsRebase ? rebaseSwizzle : NULL); tempSlice += 4 * width * height; } |