#include "texstore.h"
+#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 / 12.92;
+ }
+ else {
+ table[i] = _mesa_pow((cs + 0.055) / 1.055, 2.4);
+ }
+ }
+ tableReady = GL_TRUE;
+ }
+ return table[cs8];
+}
+
+
+#endif /* FEATURE_EXT_texture_sRGB */
+
/* Texel fetch routines for all supported formats
*/
};
+#if FEATURE_EXT_texture_sRGB
+
+const struct gl_texture_format _mesa_texformat_srgb8 = {
+ MESA_FORMAT_SRGB8, /* MesaFormat */
+ GL_RGB, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 8, /* RedBits */
+ 8, /* GreenBits */
+ 8, /* BlueBits */
+ 0, /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 3, /* TexelBytes */
+ _mesa_texstore_srgb8, /* StoreTexImageFunc */
+ NULL, /* FetchTexel1D */
+ NULL, /* FetchTexel2D */
+ NULL, /* FetchTexel3D */
+ fetch_texel_1d_srgb8, /* FetchTexel1Df */
+ fetch_texel_2d_srgb8, /* FetchTexel2Df */
+ fetch_texel_3d_srgb8, /* FetchTexel3Df */
+ store_texel_srgb8 /* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_srgba8 = {
+ MESA_FORMAT_SRGBA8, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 8, /* RedBits */
+ 8, /* GreenBits */
+ 8, /* BlueBits */
+ 8, /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 4, /* TexelBytes */
+ _mesa_texstore_srgba8, /* StoreTexImageFunc */
+ NULL, /* FetchTexel1D */
+ NULL, /* FetchTexel2D */
+ NULL, /* FetchTexel3D */
+ fetch_texel_1d_srgba8, /* FetchTexel1Df */
+ fetch_texel_2d_srgba8, /* FetchTexel2Df */
+ fetch_texel_3d_srgba8, /* FetchTexel3Df */
+ store_texel_srgba8 /* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_sl8 = {
+ MESA_FORMAT_SL8, /* MesaFormat */
+ GL_LUMINANCE, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 0, /* RedBits */
+ 0, /* GreenBits */
+ 0, /* BlueBits */
+ 0, /* AlphaBits */
+ 8, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 1, /* TexelBytes */
+ _mesa_texstore_sl8, /* StoreTexImageFunc */
+ NULL, /* FetchTexel1D */
+ NULL, /* FetchTexel2D */
+ NULL, /* FetchTexel3D */
+ fetch_texel_1d_sl8, /* FetchTexel1Df */
+ fetch_texel_2d_sl8, /* FetchTexel2Df */
+ fetch_texel_3d_sl8, /* FetchTexel3Df */
+ store_texel_sl8 /* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_sla8 = {
+ MESA_FORMAT_SLA8, /* MesaFormat */
+ GL_LUMINANCE_ALPHA, /* BaseFormat */
+ GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
+ 0, /* RedBits */
+ 0, /* GreenBits */
+ 0, /* BlueBits */
+ 8, /* AlphaBits */
+ 8, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* StencilBits */
+ 2, /* TexelBytes */
+ _mesa_texstore_sla8, /* StoreTexImageFunc */
+ NULL, /* FetchTexel1D */
+ NULL, /* FetchTexel2D */
+ NULL, /* FetchTexel3D */
+ fetch_texel_1d_sla8, /* FetchTexel1Df */
+ fetch_texel_2d_sla8, /* FetchTexel2Df */
+ fetch_texel_3d_sla8, /* FetchTexel3Df */
+ store_texel_sla8 /* StoreTexel */
+};
+
+#endif /* FEATURE_EXT_texture_sRGB */
+
const struct gl_texture_format _mesa_texformat_rgba_float32 = {
MESA_FORMAT_RGBA_FLOAT32, /* MesaFormat */
GL_RGBA, /* BaseFormat */
}
}
+#if FEATURE_EXT_texture_sRGB
+ if (ctx->Extensions.EXT_texture_sRGB) {
+ switch (internalFormat) {
+ case GL_SRGB_EXT:
+ case GL_SRGB8_EXT:
+ return &_mesa_texformat_srgb8;
+ case GL_SRGB_ALPHA_EXT:
+ case GL_SRGB8_ALPHA8_EXT:
+ return &_mesa_texformat_srgba8;
+ case GL_SLUMINANCE_EXT:
+ case GL_SLUMINANCE8_EXT:
+ return &_mesa_texformat_sl8;
+ case GL_SLUMINANCE_ALPHA_EXT:
+ case GL_SLUMINANCE8_ALPHA8_EXT:
+ return &_mesa_texformat_sla8;
+ /* NOTE: not supporting any compression of sRGB at this time */
+ case GL_COMPRESSED_SRGB_EXT:
+ return &_mesa_texformat_srgb8;
+ case GL_COMPRESSED_SRGB_ALPHA_EXT:
+ return &_mesa_texformat_srgba8;
+ case GL_COMPRESSED_SLUMINANCE_EXT:
+ return &_mesa_texformat_sl8;
+ case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
+ return &_mesa_texformat_sla8;
+ case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+ return &_mesa_texformat_srgb8;
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+ return &_mesa_texformat_srgba8;
+ default:
+ ; /* fallthrough */
+ }
+ }
+#endif /* FEATURE_EXT_texture_sRGB */
+
_mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
return NULL;
}
projects / mesa.git / blobdiff