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Diffstat (limited to 'src/mesa/main/texcompress_s3tc.c')
-rw-r--r--src/mesa/main/texcompress_s3tc.c184
1 files changed, 169 insertions, 15 deletions
diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index a19c161b2c..d17e18da6b 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -3,6 +3,7 @@
* Version: 6.5.3
*
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -53,6 +54,34 @@
#define DXTN_LIBNAME "libtxc_dxtn.so"
#endif
+#if FEATURE_EXT_texture_sRGB
+/**
+ * Convert an 8-bit sRGB value from non-linear space to a
+ * linear RGB value in [0, 1].
+ * Implemented with a 256-entry lookup table.
+ */
+static INLINE GLfloat
+nonlinear_to_linear(GLubyte cs8)
+{
+ static GLfloat table[256];
+ static GLboolean tableReady = GL_FALSE;
+ if (!tableReady) {
+ /* compute lookup table now */
+ GLuint i;
+ for (i = 0; i < 256; i++) {
+ const GLfloat cs = UBYTE_TO_FLOAT(i);
+ if (cs <= 0.04045) {
+ table[i] = cs / 12.92f;
+ }
+ else {
+ table[i] = (GLfloat) _mesa_pow((cs + 0.055) / 1.055, 2.4);
+ }
+ }
+ tableReady = GL_TRUE;
+ }
+ return table[cs8];
+}
+#endif /* FEATURE_EXT_texture_sRGB */
typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
@@ -483,6 +512,59 @@ fetch_texel_2d_f_rgba_dxt5( const struct gl_texture_image *texImage,
texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
}
+#if FEATURE_EXT_texture_sRGB
+static void
+fetch_texel_2d_f_srgb_dxt1( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel )
+{
+ /* just sample as GLchan and convert to float here */
+ GLchan rgba[4];
+ fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba);
+ texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+ texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+ texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+ texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt1( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel )
+{
+ /* just sample as GLchan and convert to float here */
+ GLchan rgba[4];
+ fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba);
+ texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+ texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+ texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+ texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt3( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel )
+{
+ /* just sample as GLchan and convert to float here */
+ GLchan rgba[4];
+ fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba);
+ texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+ texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+ texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+ texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt5( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel )
+{
+ /* just sample as GLchan and convert to float here */
+ GLchan rgba[4];
+ fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba);
+ texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+ texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+ texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+ texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+#endif
const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
MESA_FORMAT_RGB_DXT1, /* MesaFormat */
@@ -508,6 +590,78 @@ const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
NULL /* StoreTexel */
};
+const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
+ MESA_FORMAT_RGBA_DXT1, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 4, /*approx*/ /* RedBits */
+ 4, /*approx*/ /* GreenBits */
+ 4, /*approx*/ /* BlueBits */
+ 1, /*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 0, /* TexelBytes */
+ texstore_rgba_dxt1, /* StoreTexImageFunc */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_texel_2d_rgba_dxt1, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+ NULL, /*impossible*/ /* FetchTexel1Df */
+ fetch_texel_2d_f_rgba_dxt1, /* FetchTexel2Df */
+ NULL, /*impossible*/ /* FetchTexel3Df */
+ NULL /* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
+ MESA_FORMAT_RGBA_DXT3, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 4, /*approx*/ /* RedBits */
+ 4, /*approx*/ /* GreenBits */
+ 4, /*approx*/ /* BlueBits */
+ 4, /*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 0, /* TexelBytes */
+ texstore_rgba_dxt3, /* StoreTexImageFunc */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_texel_2d_rgba_dxt3, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+ NULL, /*impossible*/ /* FetchTexel1Df */
+ fetch_texel_2d_f_rgba_dxt3, /* FetchTexel2Df */
+ NULL, /*impossible*/ /* FetchTexel3Df */
+ NULL /* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
+ MESA_FORMAT_RGBA_DXT5, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 4,/*approx*/ /* RedBits */
+ 4,/*approx*/ /* GreenBits */
+ 4,/*approx*/ /* BlueBits */
+ 4,/*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 0, /* TexelBytes */
+ texstore_rgba_dxt5, /* StoreTexImageFunc */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_texel_2d_rgba_dxt5, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+ NULL, /*impossible*/ /* FetchTexel1Df */
+ fetch_texel_2d_f_rgba_dxt5, /* FetchTexel2Df */
+ NULL, /*impossible*/ /* FetchTexel3Df */
+ NULL /* StoreTexel */
+};
+
#if FEATURE_EXT_texture_sRGB
const struct gl_texture_format _mesa_texformat_srgb_dxt1 = {
MESA_FORMAT_SRGB_DXT1, /* MesaFormat */
@@ -525,17 +679,16 @@ const struct gl_texture_format _mesa_texformat_srgb_dxt1 = {
0, /* TexelBytes */
texstore_rgb_dxt1, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
- fetch_texel_2d_rgb_dxt1, /* FetchTexel2D */
+ NULL, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
- fetch_texel_2d_f_rgb_dxt1, /* FetchTexel2Df */
+ fetch_texel_2d_f_srgb_dxt1, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
NULL /* StoreTexel */
};
-#endif
-const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
- MESA_FORMAT_RGBA_DXT1, /* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt1 = {
+ MESA_FORMAT_SRGBA_DXT1, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4, /*approx*/ /* RedBits */
@@ -550,16 +703,16 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
0, /* TexelBytes */
texstore_rgba_dxt1, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
- fetch_texel_2d_rgba_dxt1, /* FetchTexel2D */
+ NULL, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
- fetch_texel_2d_f_rgba_dxt1, /* FetchTexel2Df */
+ fetch_texel_2d_f_srgba_dxt1, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
NULL /* StoreTexel */
};
-const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
- MESA_FORMAT_RGBA_DXT3, /* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt3 = {
+ MESA_FORMAT_SRGBA_DXT3, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4, /*approx*/ /* RedBits */
@@ -574,16 +727,16 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
0, /* TexelBytes */
texstore_rgba_dxt3, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
- fetch_texel_2d_rgba_dxt3, /* FetchTexel2D */
+ NULL, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
- fetch_texel_2d_f_rgba_dxt3, /* FetchTexel2Df */
+ fetch_texel_2d_f_srgba_dxt3, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
NULL /* StoreTexel */
};
-const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
- MESA_FORMAT_RGBA_DXT5, /* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt5 = {
+ MESA_FORMAT_SRGBA_DXT5, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4,/*approx*/ /* RedBits */
@@ -598,10 +751,11 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
0, /* TexelBytes */
texstore_rgba_dxt5, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
- fetch_texel_2d_rgba_dxt5, /* FetchTexel2D */
+ NULL, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
- fetch_texel_2d_f_rgba_dxt5, /* FetchTexel2Df */
+ fetch_texel_2d_f_srgba_dxt5, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
NULL /* StoreTexel */
};
+#endif
generated by cgit v1.2.3 (git 2.51.0) at 2025-10-31 23:42:27 +0000