Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 55 | pj | 1 | /* $Id: texcompress.c,v 1.1 2003-02-28 11:42:04 pj Exp $ */ |
| 2 | |||
| 3 | /* |
||
| 4 | * Mesa 3-D graphics library |
||
| 5 | * Version: 4.1 |
||
| 6 | * |
||
| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
||
| 8 | * |
||
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
||
| 10 | * copy of this software and associated documentation files (the "Software"), |
||
| 11 | * to deal in the Software without restriction, including without limitation |
||
| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
||
| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
||
| 14 | * Software is furnished to do so, subject to the following conditions: |
||
| 15 | * |
||
| 16 | * The above copyright notice and this permission notice shall be included |
||
| 17 | * in all copies or substantial portions of the Software. |
||
| 18 | * |
||
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
||
| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
||
| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
||
| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
||
| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
||
| 25 | */ |
||
| 26 | |||
| 27 | |||
| 28 | #include "glheader.h" |
||
| 29 | #include "imports.h" |
||
| 30 | #include "context.h" |
||
| 31 | #include "image.h" |
||
| 32 | #include "texcompress.h" |
||
| 33 | #include "texformat.h" |
||
| 34 | |||
| 35 | |||
| 36 | /** |
||
| 37 | * Get the list of supported internal compression formats. |
||
| 38 | * \param formats - the results list (may be NULL) |
||
| 39 | * \return number of formats. |
||
| 40 | */ |
||
| 41 | GLuint |
||
| 42 | _mesa_get_compressed_formats( GLcontext *ctx, GLint *formats ) |
||
| 43 | { |
||
| 44 | GLuint n = 0; |
||
| 45 | if (ctx->Extensions.ARB_texture_compression) { |
||
| 46 | if (ctx->Extensions.TDFX_texture_compression_FXT1) { |
||
| 47 | if (formats) { |
||
| 48 | formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX; |
||
| 49 | formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX; |
||
| 50 | } |
||
| 51 | else { |
||
| 52 | n += 4; |
||
| 53 | } |
||
| 54 | } |
||
| 55 | } |
||
| 56 | return n; |
||
| 57 | } |
||
| 58 | |||
| 59 | |||
| 60 | |||
| 61 | /** |
||
| 62 | * Return bytes of storage needed for the given texture size and compressed |
||
| 63 | * format. |
||
| 64 | * \param width, height, depth - texture size in texels |
||
| 65 | * \param texFormat - one of the compressed format enums |
||
| 66 | * \return size in bytes, or zero if bad texFormat |
||
| 67 | */ |
||
| 68 | GLuint |
||
| 69 | _mesa_compressed_texture_size( GLcontext *ctx, |
||
| 70 | GLsizei width, GLsizei height, GLsizei depth, |
||
| 71 | GLenum format ) |
||
| 72 | { |
||
| 73 | GLuint size; |
||
| 74 | |||
| 75 | switch (format) { |
||
| 76 | case GL_COMPRESSED_RGB_FXT1_3DFX: |
||
| 77 | case GL_COMPRESSED_RGBA_FXT1_3DFX: |
||
| 78 | /* round up to multiple of 4 */ |
||
| 79 | size = ((width + 7) / 8) * ((height + 3) / 4) * 16; |
||
| 80 | return size; |
||
| 81 | default: |
||
| 82 | _mesa_problem(ctx, "bad texformat in compressed_texture_size"); |
||
| 83 | return 0; |
||
| 84 | } |
||
| 85 | } |
||
| 86 | |||
| 87 | |||
| 88 | /* |
||
| 89 | * Compute the bytes per row in a compressed texture image. |
||
| 90 | */ |
||
| 91 | GLint |
||
| 92 | _mesa_compressed_row_stride(GLenum format, GLsizei width) |
||
| 93 | { |
||
| 94 | GLint bytesPerTile, stride; |
||
| 95 | |||
| 96 | switch (format) { |
||
| 97 | default: |
||
| 98 | return 0; |
||
| 99 | } |
||
| 100 | |||
| 101 | stride = ((width + 3) / 4) * bytesPerTile; |
||
| 102 | return stride; |
||
| 103 | } |
||
| 104 | |||
| 105 | |||
| 106 | /* |
||
| 107 | * Return the address of the pixel at (col, row, img) in a |
||
| 108 | * compressed texture image. |
||
| 109 | * \param col, row, img - image position (3D) |
||
| 110 | * \param format - compressed image format |
||
| 111 | * \param width - image width |
||
| 112 | * \param image - the image address |
||
| 113 | * \return address of pixel at (row, col) |
||
| 114 | */ |
||
| 115 | GLubyte * |
||
| 116 | _mesa_compressed_image_address(GLint col, GLint row, GLint img, |
||
| 117 | GLenum format, |
||
| 118 | GLsizei width, const GLubyte *image) |
||
| 119 | { |
||
| 120 | GLint bytesPerTile, stride; |
||
| 121 | GLubyte *addr; |
||
| 122 | |||
| 123 | ASSERT((row & 3) == 0); |
||
| 124 | ASSERT((col & 3) == 0); |
||
| 125 | (void) img; |
||
| 126 | |||
| 127 | switch (format) { |
||
| 128 | default: |
||
| 129 | return 0; |
||
| 130 | } |
||
| 131 | |||
| 132 | stride = ((width + 3) / 4) * bytesPerTile; |
||
| 133 | |||
| 134 | addr = (GLubyte *) image + (row / 4) * stride + (col / 4) * bytesPerTile; |
||
| 135 | return addr; |
||
| 136 | } |
||
| 137 | |||
| 138 | |||
| 139 | |||
| 140 | /* |
||
| 141 | * \param srcRowStride - source stride, in pixels |
||
| 142 | */ |
||
| 143 | void |
||
| 144 | _mesa_compress_teximage( GLcontext *ctx, GLsizei width, GLsizei height, |
||
| 145 | GLenum srcFormat, const GLchan *source, |
||
| 146 | GLint srcRowStride, |
||
| 147 | const struct gl_texture_format *dstFormat, |
||
| 148 | GLubyte *dest, GLint dstRowStride ) |
||
| 149 | { |
||
| 150 | switch (dstFormat->MesaFormat) { |
||
| 151 | default: |
||
| 152 | _mesa_problem(ctx, "Bad dstFormat in _mesa_compress_teximage()"); |
||
| 153 | return; |
||
| 154 | } |
||
| 155 | } |