Mesa (gallium-mesa-7.4): mesa: fixes for srgb formats

[Roland Scheidegger]

Module: Mesa
Branch: gallium-mesa-7.4
Commit: c98040be3c76c977f1d5ac23f6b2212317db5c80
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c98040be3c76c977f1d5ac23f6b2212317db5c80

Author: Roland Scheidegger <sroland at tungstengraphics.com>
Date:   Mon Feb  9 23:10:16 2009 +0100

mesa: fixes for srgb formats

swizzling in fetch/store srgba/sargb functions fixed (consistent with
equivalent non-srgb formats now).

---

 src/mesa/main/texformat_tmp.h |   34 ++++++++++++++--------------------
 1 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/src/mesa/main/texformat_tmp.h b/src/mesa/main/texformat_tmp.h
index 08b6d8f..275340c 100644
--- a/src/mesa/main/texformat_tmp.h
+++ b/src/mesa/main/texformat_tmp.h
@@ -1223,11 +1223,11 @@ static void store_texel_srgb8(struct gl_texture_image *texImage,
 static void FETCH(srgba8)(const struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, GLfloat *texel )
 {
-   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
-   texel[RCOMP] = nonlinear_to_linear(src[0]);
-   texel[GCOMP] = nonlinear_to_linear(src[1]);
-   texel[BCOMP] = nonlinear_to_linear(src[2]);
-   texel[ACOMP] = UBYTE_TO_FLOAT(src[3]); /* linear! */
+   const GLuint s = *TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   texel[RCOMP] = nonlinear_to_linear( (s >> 24) );
+   texel[GCOMP] = nonlinear_to_linear( (s >> 16) & 0xff );
+   texel[BCOMP] = nonlinear_to_linear( (s >>  8) & 0xff );
+   texel[ACOMP] = UBYTE_TO_FLOAT( (s      ) & 0xff ); /* linear! */
 }
 
 #if DIM == 3
@@ -1235,11 +1235,8 @@ static void store_texel_srgba8(struct gl_texture_image *texImage,
                                GLint i, GLint j, GLint k, const void *texel)
 {
    const GLubyte *rgba = (const GLubyte *) texel;
-   GLubyte *dst = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
-   dst[0] = rgba[RCOMP];
-   dst[1] = rgba[GCOMP];
-   dst[2] = rgba[BCOMP];
-   dst[3] = rgba[ACOMP];
+   GLuint *dst = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_8888(rgba[RCOMP], rgba[GCOMP], rgba[BCOMP], rgba[ACOMP]);
 }
 #endif
 
@@ -1247,11 +1244,11 @@ static void store_texel_srgba8(struct gl_texture_image *texImage,
 static void FETCH(sargb8)(const struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, GLfloat *texel )
 {
-   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
-   texel[RCOMP] = nonlinear_to_linear(src[1]);
-   texel[GCOMP] = nonlinear_to_linear(src[2]);
-   texel[BCOMP] = nonlinear_to_linear(src[3]);
-   texel[ACOMP] = UBYTE_TO_FLOAT(src[0]); /* linear! */
+   const GLuint s = *TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   texel[RCOMP] = nonlinear_to_linear( (s >> 16) & 0xff );
+   texel[GCOMP] = nonlinear_to_linear( (s >>  8) & 0xff );
+   texel[BCOMP] = nonlinear_to_linear( (s      ) & 0xff );
+   texel[ACOMP] = UBYTE_TO_FLOAT( (s >> 24) ); /* linear! */
 }
 
 #if DIM == 3
@@ -1259,11 +1256,8 @@ static void store_texel_sargb8(struct gl_texture_image *texImage,
                                GLint i, GLint j, GLint k, const void *texel)
 {
    const GLubyte *rgba = (const GLubyte *) texel;
-   GLubyte *dst = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
-   dst[0] = rgba[ACOMP];
-   dst[1] = rgba[RCOMP];
-   dst[2] = rgba[GCOMP];
-   dst[3] = rgba[BCOMP];
+   GLuint *dst = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_8888(rgba[ACOMP], rgba[RCOMP], rgba[GCOMP], rgba[BCOMP]);
 }
 #endif