src/mesa/drivers/dri/intel/intel_tex_format.c

   1 #include "intel_context.h"
   2 #include "intel_tex.h"
   3 #include "main/enums.h"
   4 #include "main/formats.h"
   5
   6 /**
   7  * Choose hardware texture format given the user's glTexImage parameters.
   8  *
   9  * It works out that this function is fine for all the supported
  10  * hardware.  However, there is still a need to map the formats onto
  11  * hardware descriptors.
  12  *
  13  * Note that the i915 can actually support many more formats than
  14  * these if we take the step of simply swizzling the colors
  15  * immediately after sampling...
  16  */
  17 gl_format
  18 intelChooseTextureFormat(struct gl_context * ctx, GLint internalFormat,
  19                          GLenum format, GLenum type)
  20 {
  21    struct intel_context *intel = intel_context(ctx);
  22
  23 #if 0
  24    printf("%s intFmt=0x%x format=0x%x type=0x%x\n",
  25           __FUNCTION__, internalFormat, format, type);
  26 #endif
  27
  28    switch (internalFormat) {
  29    case 4:
  30    case GL_RGBA:
  31    case GL_COMPRESSED_RGBA:
  32       if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV)
  33          return MESA_FORMAT_ARGB4444;
  34       else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV)
  35          return MESA_FORMAT_ARGB1555;
  36       else
  37          return MESA_FORMAT_ARGB8888;
  38
  39    case 3:
  40    case GL_RGB:
  41    case GL_COMPRESSED_RGB:
  42       if (type == GL_UNSIGNED_SHORT_5_6_5)
  43          return MESA_FORMAT_RGB565;
  44       else if (intel->has_xrgb_textures)
  45          return MESA_FORMAT_XRGB8888;
  46       else
  47          return MESA_FORMAT_ARGB8888;
  48
  49    case GL_RGBA8:
  50    case GL_RGB10_A2:
  51    case GL_RGBA12:
  52    case GL_RGBA16:
  53       return MESA_FORMAT_ARGB8888;
  54
  55    case GL_RGBA4:
  56    case GL_RGBA2:
  57       return MESA_FORMAT_ARGB4444;
  58
  59    case GL_RGB5_A1:
  60       return MESA_FORMAT_ARGB1555;
  61
  62    case GL_RGB8:
  63    case GL_RGB10:
  64    case GL_RGB12:
  65    case GL_RGB16:
  66       if (intel->has_xrgb_textures)
  67          return MESA_FORMAT_XRGB8888;
  68       else
  69          return MESA_FORMAT_ARGB8888;
  70
  71    case GL_RGB5:
  72    case GL_RGB4:
  73    case GL_R3_G3_B2:
  74       return MESA_FORMAT_RGB565;
  75
  76    case GL_ALPHA:
  77    case GL_ALPHA4:
  78    case GL_ALPHA8:
  79    case GL_ALPHA12:
  80    case GL_ALPHA16:
  81    case GL_COMPRESSED_ALPHA:
  82       return MESA_FORMAT_A8;
  83
  84    case 1:
  85    case GL_LUMINANCE:
  86    case GL_LUMINANCE4:
  87    case GL_LUMINANCE8:
  88    case GL_LUMINANCE12:
  89    case GL_LUMINANCE16:
  90    case GL_COMPRESSED_LUMINANCE:
  91       return MESA_FORMAT_L8;
  92
  93    case GL_LUMINANCE12_ALPHA4:
  94    case GL_LUMINANCE12_ALPHA12:
  95    case GL_LUMINANCE16_ALPHA16:
  96       /* i915 could implement this mode using MT_32BIT_RG1616.  However, this
  97        * would require an extra swizzle instruction in the fragment shader to
  98        * convert the { R, G, 1.0, 1.0 } to { R, R, R, G }.
  99        */
 100 #ifndef I915
 101       return MESA_FORMAT_AL1616;
 102 #else
 103       /* FALLTHROUGH */
 104 #endif
 105
 106    case 2:
 107    case GL_LUMINANCE_ALPHA:
 108    case GL_LUMINANCE4_ALPHA4:
 109    case GL_LUMINANCE6_ALPHA2:
 110    case GL_LUMINANCE8_ALPHA8:
 111    case GL_COMPRESSED_LUMINANCE_ALPHA:
 112       return MESA_FORMAT_AL88;
 113
 114    case GL_INTENSITY:
 115    case GL_INTENSITY4:
 116    case GL_INTENSITY8:
 117    case GL_INTENSITY12:
 118    case GL_INTENSITY16:
 119    case GL_COMPRESSED_INTENSITY:
 120       return MESA_FORMAT_I8;
 121
 122    case GL_YCBCR_MESA:
 123       if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE)
 124          return MESA_FORMAT_YCBCR;
 125       else
 126          return MESA_FORMAT_YCBCR_REV;
 127
 128    case GL_COMPRESSED_RGB_FXT1_3DFX:
 129       return MESA_FORMAT_RGB_FXT1;
 130    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 131       return MESA_FORMAT_RGBA_FXT1;
 132
 133    case GL_RGB_S3TC:
 134    case GL_RGB4_S3TC:
 135    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 136       return MESA_FORMAT_RGB_DXT1;
 137
 138    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 139       return MESA_FORMAT_RGBA_DXT1;
 140
 141    case GL_RGBA_S3TC:
 142    case GL_RGBA4_S3TC:
 143    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 144       return MESA_FORMAT_RGBA_DXT3;
 145
 146    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 147       return MESA_FORMAT_RGBA_DXT5;
 148
 149    case GL_DEPTH_COMPONENT:
 150    case GL_DEPTH_COMPONENT16:
 151    case GL_DEPTH_COMPONENT24:
 152    case GL_DEPTH_COMPONENT32:
 153 #if 0
 154       return MESA_FORMAT_Z16;
 155 #else
 156       /* fall-through.
 157        * 16bpp depth texture can't be paired with a stencil buffer so
 158        * always used combined depth/stencil format.
 159        */
 160 #endif
 161    case GL_DEPTH_STENCIL_EXT:
 162    case GL_DEPTH24_STENCIL8_EXT:
 163       return MESA_FORMAT_S8_Z24;
 164
 165 #ifndef I915
 166    case GL_SRGB_EXT:
 167    case GL_SRGB8_EXT:
 168    case GL_SRGB_ALPHA_EXT:
 169    case GL_SRGB8_ALPHA8_EXT:
 170    case GL_COMPRESSED_SRGB_EXT:
 171    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 172    case GL_COMPRESSED_SLUMINANCE_EXT:
 173    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 174       return MESA_FORMAT_SARGB8;
 175    case GL_SLUMINANCE_EXT:
 176    case GL_SLUMINANCE8_EXT:
 177       if (intel->has_luminance_srgb)
 178          return MESA_FORMAT_SL8;
 179       else
 180          return MESA_FORMAT_SARGB8;
 181    case GL_SLUMINANCE_ALPHA_EXT:
 182    case GL_SLUMINANCE8_ALPHA8_EXT:
 183       if (intel->has_luminance_srgb)
 184          return MESA_FORMAT_SLA8;
 185       else
 186          return MESA_FORMAT_SARGB8;
 187    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 188    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 189    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 190    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 191       return MESA_FORMAT_SRGB_DXT1;
 192
 193    /* i915 could also do this */
 194    case GL_DUDV_ATI:
 195    case GL_DU8DV8_ATI:
 196       return MESA_FORMAT_DUDV8;
 197    case GL_RGBA_SNORM:
 198    case GL_RGBA8_SNORM:
 199       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 200
 201    /* i915 can do a RG16, but it can't do any of the other RED or RG formats.
 202     * In addition, it only implements the broken D3D mode where undefined
 203     * components are read as 1.0.  I'm not sure who thought reading
 204     * { R, G, 1.0, 1.0 } from a red-green texture would be useful.
 205     */
 206    case GL_RED:
 207    case GL_R8:
 208       return MESA_FORMAT_R8;
 209    case GL_R16:
 210       return MESA_FORMAT_R16;
 211    case GL_RG:
 212    case GL_RG8:
 213       return MESA_FORMAT_RG88;
 214    case GL_RG16:
 215       return MESA_FORMAT_RG1616;
 216 #endif
 217
 218    default:
 219       fprintf(stderr, "unexpected texture format %s in %s\n",
 220               _mesa_lookup_enum_by_nr(internalFormat), __FUNCTION__);
 221       return MESA_FORMAT_NONE;
 222    }
 223
 224    return MESA_FORMAT_NONE;       /* never get here */
 225 }
 226
 227 int intel_compressed_num_bytes(GLuint mesaFormat)
 228 {
 229    GLuint bw, bh;
 230    GLuint block_size;
 231
 232    block_size = _mesa_get_format_bytes(mesaFormat);
 233    _mesa_get_format_block_size(mesaFormat, &bw, &bh);
 234
 235    return block_size / bw;
 236 }