📄 texformat.c
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0, /* IntensityBits */
8, /* IndexBits */
0, /* DepthBits */
1, /* TexelBytes */
_mesa_texstore_ci8, /* StoreTexImageFunc */
fetch_texel_1d_ci8, /* FetchTexel1D */
fetch_texel_2d_ci8, /* FetchTexel2D */
fetch_texel_3d_ci8, /* FetchTexel3D */
fetch_texel_1d_f_ci8, /* FetchTexel1Df */
fetch_texel_2d_f_ci8, /* FetchTexel2Df */
fetch_texel_3d_f_ci8, /* FetchTexel3Df */
store_texel_ci8 /* StoreTexel */
};
const struct gl_texture_format _mesa_texformat_ycbcr = {
MESA_FORMAT_YCBCR, /* MesaFormat */
GL_YCBCR_MESA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
0, /* RedBits */
0, /* GreenBits */
0, /* BlueBits */
0, /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
2, /* TexelBytes */
_mesa_texstore_ycbcr, /* StoreTexImageFunc */
fetch_texel_1d_ycbcr, /* FetchTexel1D */
fetch_texel_2d_ycbcr, /* FetchTexel2D */
fetch_texel_3d_ycbcr, /* FetchTexel3D */
fetch_texel_1d_f_ycbcr, /* FetchTexel1Df */
fetch_texel_2d_f_ycbcr, /* FetchTexel2Df */
fetch_texel_3d_f_ycbcr, /* FetchTexel3Df */
store_texel_ycbcr /* StoreTexel */
};
const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
MESA_FORMAT_YCBCR_REV, /* MesaFormat */
GL_YCBCR_MESA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
0, /* RedBits */
0, /* GreenBits */
0, /* BlueBits */
0, /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
2, /* TexelBytes */
_mesa_texstore_ycbcr, /* StoreTexImageFunc */
fetch_texel_1d_ycbcr_rev, /* FetchTexel1D */
fetch_texel_2d_ycbcr_rev, /* FetchTexel2D */
fetch_texel_3d_ycbcr_rev, /* FetchTexel3D */
fetch_texel_1d_f_ycbcr_rev, /* FetchTexel1Df */
fetch_texel_2d_f_ycbcr_rev, /* FetchTexel2Df */
fetch_texel_3d_f_ycbcr_rev, /* FetchTexel3Df */
store_texel_ycbcr_rev /* StoreTexel */
};
/*@}*/
/***************************************************************/
/** \name Null format (useful for proxy textures) */
/*@{*/
const struct gl_texture_format _mesa_null_texformat = {
-1, /* MesaFormat */
0, /* BaseFormat */
GL_NONE, /* DataType */
0, /* RedBits */
0, /* GreenBits */
0, /* BlueBits */
0, /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
0, /* TexelBytes */
NULL, /* StoreTexImageFunc */
fetch_null_texel, /* FetchTexel1D */
fetch_null_texel, /* FetchTexel2D */
fetch_null_texel, /* FetchTexel3D */
fetch_null_texelf, /* FetchTexel1Df */
fetch_null_texelf, /* FetchTexel2Df */
fetch_null_texelf, /* FetchTexel3Df */
store_null_texel /* StoreTexel */
};
/*@}*/
/**
* Choose an appropriate texture format given the format, type and
* internalFormat parameters passed to glTexImage().
*
* \param ctx the GL context.
* \param internalFormat user's prefered internal texture format.
* \param format incoming image pixel format.
* \param type incoming image data type.
*
* \return a pointer to a gl_texture_format object which describes the
* choosen texture format, or NULL on failure.
*
* This is called via dd_function_table::ChooseTextureFormat. Hardware drivers
* will typically override this function with a specialized version.
*/
const struct gl_texture_format *
_mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
GLenum format, GLenum type )
{
(void) format;
(void) type;
switch (internalFormat) {
/* RGBA formats */
case 4:
case GL_RGBA:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
return &_mesa_texformat_rgba;
case GL_RGBA8:
return &_mesa_texformat_rgba8888;
case GL_RGB5_A1:
return &_mesa_texformat_argb1555;
case GL_RGBA2:
return &_mesa_texformat_argb4444_rev; /* just to test another format*/
case GL_RGBA4:
return &_mesa_texformat_argb4444;
/* RGB formats */
case 3:
case GL_RGB:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
return &_mesa_texformat_rgb;
case GL_RGB8:
return &_mesa_texformat_rgb888;
case GL_R3_G3_B2:
return &_mesa_texformat_rgb332;
case GL_RGB4:
return &_mesa_texformat_rgb565_rev; /* just to test another format */
case GL_RGB5:
return &_mesa_texformat_rgb565;
/* Alpha formats */
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA12:
case GL_ALPHA16:
return &_mesa_texformat_alpha;
case GL_ALPHA8:
return &_mesa_texformat_a8;
/* Luminance formats */
case 1:
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
return &_mesa_texformat_luminance;
case GL_LUMINANCE8:
return &_mesa_texformat_l8;
/* Luminance/Alpha formats */
case 2:
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
return &_mesa_texformat_luminance_alpha;
case GL_LUMINANCE8_ALPHA8:
return &_mesa_texformat_al88;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY12:
case GL_INTENSITY16:
return &_mesa_texformat_intensity;
case GL_INTENSITY8:
return &_mesa_texformat_i8;
case GL_COLOR_INDEX:
case GL_COLOR_INDEX1_EXT:
case GL_COLOR_INDEX2_EXT:
case GL_COLOR_INDEX4_EXT:
case GL_COLOR_INDEX12_EXT:
case GL_COLOR_INDEX16_EXT:
case GL_COLOR_INDEX8_EXT:
return &_mesa_texformat_ci8;
default:
; /* fallthrough */
}
if (ctx->Extensions.SGIX_depth_texture ||
ctx->Extensions.ARB_depth_texture) {
switch (internalFormat) {
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT24_SGIX:
case GL_DEPTH_COMPONENT32_SGIX:
return &_mesa_texformat_depth_component_float32;
case GL_DEPTH_COMPONENT16_SGIX:
return &_mesa_texformat_depth_component16;
default:
; /* fallthrough */
}
}
if (ctx->Extensions.ARB_texture_compression) {
switch (internalFormat) {
case GL_COMPRESSED_ALPHA_ARB:
return &_mesa_texformat_alpha;
case GL_COMPRESSED_LUMINANCE_ARB:
return &_mesa_texformat_luminance;
case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
return &_mesa_texformat_luminance_alpha;
case GL_COMPRESSED_INTENSITY_ARB:
return &_mesa_texformat_intensity;
case GL_COMPRESSED_RGB_ARB:
if (ctx->Extensions.TDFX_texture_compression_FXT1)
return &_mesa_texformat_rgb_fxt1;
else if (ctx->Extensions.EXT_texture_compression_s3tc ||
ctx->Extensions.S3_s3tc)
return &_mesa_texformat_rgb_dxt1;
else
return &_mesa_texformat_rgb;
case GL_COMPRESSED_RGBA_ARB:
if (ctx->Extensions.TDFX_texture_compression_FXT1)
return &_mesa_texformat_rgba_fxt1;
else if (ctx->Extensions.EXT_texture_compression_s3tc ||
ctx->Extensions.S3_s3tc)
return &_mesa_texformat_rgba_dxt3; /* Not rgba_dxt1, see spec */
else
return &_mesa_texformat_rgba;
default:
; /* fallthrough */
}
}
if (ctx->Extensions.MESA_ycbcr_texture) {
if (internalFormat == GL_YCBCR_MESA) {
if (type == GL_UNSIGNED_SHORT_8_8_MESA)
return &_mesa_texformat_ycbcr;
else
return &_mesa_texformat_ycbcr_rev;
}
}
if (ctx->Extensions.TDFX_texture_compression_FXT1) {
switch (internalFormat) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
return &_mesa_texformat_rgb_fxt1;
case GL_COMPRESSED_RGBA_FXT1_3DFX:
return &_mesa_texformat_rgba_fxt1;
default:
; /* fallthrough */
}
}
if (ctx->Extensions.EXT_texture_compression_s3tc) {
switch (internalFormat) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
return &_mesa_texformat_rgb_dxt1;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
return &_mesa_texformat_rgba_dxt1;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
return &_mesa_texformat_rgba_dxt3;
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
return &_mesa_texformat_rgba_dxt5;
default:
; /* fallthrough */
}
}
if (ctx->Extensions.S3_s3tc) {
switch (internalFormat) {
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
return &_mesa_texformat_rgb_dxt1;
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
return &_mesa_texformat_rgba_dxt3;
default:
; /* fallthrough */
}
}
if (ctx->Extensions.ARB_texture_float) {
switch (internalFormat) {
case GL_ALPHA16F_ARB:
return &_mesa_texformat_alpha_float16;
case GL_ALPHA32F_ARB:
return &_mesa_texformat_alpha_float32;
case GL_LUMINANCE16F_ARB:
return &_mesa_texformat_luminance_float16;
case GL_LUMINANCE32F_ARB:
return &_mesa_texformat_luminance_float32;
case GL_LUMINANCE_ALPHA16F_ARB:
return &_mesa_texformat_luminance_alpha_float16;
case GL_LUMINANCE_ALPHA32F_ARB:
return &_mesa_texformat_luminance_alpha_float32;
case GL_INTENSITY16F_ARB:
return &_mesa_texformat_intensity_float16;
case GL_INTENSITY32F_ARB:
return &_mesa_texformat_intensity_float32;
case GL_RGB16F_ARB:
return &_mesa_texformat_rgb_float16;
case GL_RGB32F_ARB:
return &_mesa_texformat_rgb_float32;
case GL_RGBA16F_ARB:
return &_mesa_texformat_rgba_float16;
case GL_RGBA32F_ARB:
return &_mesa_texformat_rgba_float32;
default:
; /* fallthrough */
}
}
_mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
return NULL;
}
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