-/* $Id: texcompress.c,v 1.4 2003/03/24 20:00:09 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
* Version: 5.1
n += 2;
}
}
+ if (ctx->Extensions.EXT_texture_compression_s3tc) {
+ if (formats) {
+ formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
+ /* Skip this one because it has a restriction (all transparent
+ * pixels become black). See the texture compressions spec for
+ * a detailed explanation. This is what NVIDIA does.
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+ */
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+ }
+ else {
+ n += 3;
+ }
+ }
}
return n;
}
/**
* Return bytes of storage needed for the given texture size and compressed
* format.
- * \param width, height, depth - texture size in texels
- * \param texFormat - one of the compressed format enums
+ * \param width, height, depth the texture size in texels
+ * \param texFormat one of the specific compressed format enums
* \return size in bytes, or zero if bad texFormat
*/
GLuint
/* round up to multiple of 4 */
size = ((width + 7) / 8) * ((height + 3) / 4) * 16;
return size;
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ /* round up width, height to next multiple of 4 */
+ width = (width + 3) & ~3;
+ height = (height + 3) & ~3;
+ ASSERT(depth == 1);
+ /* 8 bytes per 4x4 tile of RGB[A] texels */
+ size = (width * height * 8) / 16;
+ /* Textures smaller than 4x4 will effectively be made into 4x4 and
+ * take 8 bytes.
+ */
+ if (size < 8)
+ size = 8;
+ return size;
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ /* round up width, height to next multiple of 4 */
+ width = (width + 3) & ~3;
+ height = (height + 3) & ~3;
+ ASSERT(depth == 1);
+ /* 16 bytes per 4x4 tile of RGBA texels */
+ size = width * height; /* simple! */
+ /* Textures smaller than 4x4 will effectively be made into 4x4 and
+ * take 16 bytes.
+ */
+ if (size < 16)
+ size = 16;
+ return size;
default:
_mesa_problem(ctx, "bad texformat in compressed_texture_size");
return 0;
}
-/*
+/**
* Compute the bytes per row in a compressed texture image.
+ * We use this for computing the destination address for sub-texture updates.
+ * \param format one of the specific texture compression formats
+ * \param width image width in pixels
+ * \return stride, in bytes, between rows for compressed image
*/
GLint
_mesa_compressed_row_stride(GLenum format, GLsizei width)
GLint bytesPerTile, stride;
switch (format) {
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ bytesPerTile = 8;
+ break;
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ bytesPerTile = 16;
+ break;
default:
return 0;
}
}
-/*
+/**
* Return the address of the pixel at (col, row, img) in a
* compressed texture image.
* \param col, row, img - image position (3D)
(void) img;
switch (format) {
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ bytesPerTile = 8;
+ break;
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ bytesPerTile = 16;
+ break;
default:
return 0;
}
-/* $Id: texformat.c,v 1.19 2003/03/01 01:50:22 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
* Version: 5.1
fetch_3d_texel_ycbcr, /* FetchTexel3D */
};
-
const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
MESA_FORMAT_YCBCR_REV, /* MesaFormat */
GL_YCBCR_MESA, /* BaseFormat */
fetch_3d_texel_ycbcr_rev, /* FetchTexel3D */
};
+const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
+ MESA_FORMAT_RGB_DXT1, /* MesaFormat */
+ GL_RGB, /* BaseFormat */
+ 4, /*approx*/ /* RedBits */
+ 4, /*approx*/ /* GreenBits */
+ 4, /*approx*/ /* BlueBits */
+ 0, /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* TexelBytes */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_2d_texel_rgb_dxt1, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
+ MESA_FORMAT_RGBA_DXT1, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ 4, /*approx*/ /* RedBits */
+ 4, /*approx*/ /* GreenBits */
+ 4, /*approx*/ /* BlueBits */
+ 1, /*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* TexelBytes */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_2d_texel_rgba_dxt1, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
+ MESA_FORMAT_RGBA_DXT3, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ 4, /*approx*/ /* RedBits */
+ 4, /*approx*/ /* GreenBits */
+ 4, /*approx*/ /* BlueBits */
+ 4, /*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* TexelBytes */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_2d_texel_rgba_dxt3, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
+ MESA_FORMAT_RGBA_DXT5, /* MesaFormat */
+ GL_RGBA, /* BaseFormat */
+ 4,/*approx*/ /* RedBits */
+ 4,/*approx*/ /* GreenBits */
+ 4,/*approx*/ /* BlueBits */
+ 4,/*approx*/ /* AlphaBits */
+ 0, /* LuminanceBits */
+ 0, /* IntensityBits */
+ 0, /* IndexBits */
+ 0, /* DepthBits */
+ 0, /* TexelBytes */
+ NULL, /*impossible*/ /* FetchTexel1D */
+ fetch_2d_texel_rgba_dxt5, /* FetchTexel2D */
+ NULL, /*impossible*/ /* FetchTexel3D */
+};
+
/* Big-endian */
#if 0
case GL_COMPRESSED_RGB_ARB:
if (!ctx->Extensions.ARB_texture_compression)
_mesa_problem(ctx, "texture compression extension not enabled");
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgb_dxt1;
return &_mesa_texformat_rgb;
case GL_COMPRESSED_RGBA_ARB:
if (!ctx->Extensions.ARB_texture_compression)
_mesa_problem(ctx, "texture compression extension not enabled");
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgba_dxt3; /* Not rgba_dxt1! See the spec */
return &_mesa_texformat_rgba;
/* GL_MESA_ycrcr_texture */
else
return &_mesa_texformat_ycbcr_rev;
+ /* GL_EXT_texture_compression_s3tc */
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgb_dxt1;
+ else
+ return NULL;
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgba_dxt1;
+ else
+ return NULL;
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgba_dxt3;
+ else
+ return NULL;
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ if (ctx->Extensions.EXT_texture_compression_s3tc)
+ return &_mesa_texformat_rgba_dxt5;
+ else
+ return NULL;
+
default:
_mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
return NULL;
-/* $Id: texformat.h,v 1.13 2002/10/29 20:28:49 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 5.1
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
MESA_FORMAT_YCBCR, /* YYYY YYYY UorV UorV */
MESA_FORMAT_YCBCR_REV, /* UorV UorV YYYY YYYY */
+ MESA_FORMAT_RGB_DXT1,
+ MESA_FORMAT_RGBA_DXT1,
+ MESA_FORMAT_RGBA_DXT3,
+ MESA_FORMAT_RGBA_DXT5,
+
#if 0
/* upcoming little-endian formats: */
extern const struct gl_texture_format _mesa_texformat_ci8;
extern const struct gl_texture_format _mesa_texformat_ycbcr;
extern const struct gl_texture_format _mesa_texformat_ycbcr_rev;
+extern const struct gl_texture_format _mesa_texformat_rgb_dxt1;
+extern const struct gl_texture_format _mesa_texformat_rgba_dxt1;
+extern const struct gl_texture_format _mesa_texformat_rgba_dxt3;
+extern const struct gl_texture_format _mesa_texformat_rgba_dxt5;
/* The null format:
*/
-/* $Id: texformat_tmp.h,v 1.10 2002/10/29 20:28:50 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 5.1
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
}
+#if DIM == 2
+static void FETCH(rgb_dxt1)( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLvoid *texel )
+{
+ /* Extract the (i,j) pixel from texImage->Data and return it
+ * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
+ */
+}
+#endif
+
+#if DIM == 2
+static void FETCH(rgba_dxt1)( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLvoid *texel )
+{
+ /* Extract the (i,j) pixel from texImage->Data and return it
+ * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
+ */
+}
+#endif
+
+#if DIM == 2
+static void FETCH(rgba_dxt3)( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLvoid *texel )
+{
+ /* Extract the (i,j) pixel from texImage->Data and return it
+ * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
+ */
+}
+#endif
+
+#if DIM == 2
+static void FETCH(rgba_dxt5)( const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLvoid *texel )
+{
+ /* Extract the (i,j) pixel from texImage->Data and return it
+ * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
+ */
+}
+#endif
+
+
+
/* big-endian */
#if 0
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