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

   1 #include "intel_context.h"
   2 #include "intel_tex.h"
   3 #include "intel_chipset.h"
   4 #include "main/enums.h"
   5
   6
   7 /**
   8  * Choose hardware texture format given the user's glTexImage parameters.
   9  *
  10  * It works out that this function is fine for all the supported
  11  * hardware.  However, there is still a need to map the formats onto
  12  * hardware descriptors.
  13  *
  14  * Note that the i915 can actually support many more formats than
  15  * these if we take the step of simply swizzling the colors
  16  * immediately after sampling...
  17  */
  18 gl_format
  19 intelChooseTextureFormat(GLcontext * ctx, GLint internalFormat,
  20                          GLenum format, GLenum type)
  21 {
  22    struct intel_context *intel = intel_context(ctx);
  23    const GLboolean do32bpt = (intel->ctx.Visual.rgbBits >= 24);
  24
  25 #if 0
  26    printf("%s intFmt=0x%x format=0x%x type=0x%x\n",
  27           __FUNCTION__, internalFormat, format, type);
  28 #endif
  29
  30    switch (internalFormat) {
  31    case 4:
  32    case GL_RGBA:
  33    case GL_COMPRESSED_RGBA:
  34       if (format == GL_BGRA) {
  35          if (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) {
  36             return MESA_FORMAT_ARGB8888;
  37          }
  38          else if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
  39             return MESA_FORMAT_ARGB4444;
  40          }
  41          else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
  42             return MESA_FORMAT_ARGB1555;
  43          }
  44       }
  45       return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_ARGB4444;
  46
  47    case 3:
  48    case GL_RGB:
  49    case GL_COMPRESSED_RGB:
  50       if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
  51          return MESA_FORMAT_RGB565;
  52       }
  53       /* XXX use MESA_FORMAT_XRGB8888 someday */
  54       return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_RGB565;
  55
  56    case GL_RGBA8:
  57    case GL_RGB10_A2:
  58    case GL_RGBA12:
  59    case GL_RGBA16:
  60       return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_ARGB4444;
  61
  62    case GL_RGBA4:
  63    case GL_RGBA2:
  64       return MESA_FORMAT_ARGB4444;
  65
  66    case GL_RGB5_A1:
  67       return MESA_FORMAT_ARGB1555;
  68
  69    case GL_RGB8:
  70    case GL_RGB10:
  71    case GL_RGB12:
  72    case GL_RGB16:
  73       /* XXX use MESA_FORMAT_XRGB8888 someday */
  74       return MESA_FORMAT_ARGB8888;
  75
  76    case GL_RGB5:
  77    case GL_RGB4:
  78    case GL_R3_G3_B2:
  79       return MESA_FORMAT_RGB565;
  80
  81    case GL_ALPHA:
  82    case GL_ALPHA4:
  83    case GL_ALPHA8:
  84    case GL_ALPHA12:
  85    case GL_ALPHA16:
  86    case GL_COMPRESSED_ALPHA:
  87       return MESA_FORMAT_A8;
  88
  89    case 1:
  90    case GL_LUMINANCE:
  91    case GL_LUMINANCE4:
  92    case GL_LUMINANCE8:
  93    case GL_LUMINANCE12:
  94    case GL_LUMINANCE16:
  95    case GL_COMPRESSED_LUMINANCE:
  96       return MESA_FORMAT_L8;
  97
  98    case GL_LUMINANCE12_ALPHA4:
  99    case GL_LUMINANCE12_ALPHA12:
 100    case GL_LUMINANCE16_ALPHA16:
 101 #ifndef I915
 102       return MESA_FORMAT_AL1616;
 103 #else
 104       /* FALLTHROUGH */
 105 #endif
 106
 107    case 2:
 108    case GL_LUMINANCE_ALPHA:
 109    case GL_LUMINANCE4_ALPHA4:
 110    case GL_LUMINANCE6_ALPHA2:
 111    case GL_LUMINANCE8_ALPHA8:
 112    case GL_COMPRESSED_LUMINANCE_ALPHA:
 113       return MESA_FORMAT_AL88;
 114
 115    case GL_INTENSITY:
 116    case GL_INTENSITY4:
 117    case GL_INTENSITY8:
 118    case GL_INTENSITY12:
 119    case GL_INTENSITY16:
 120    case GL_COMPRESSED_INTENSITY:
 121       return MESA_FORMAT_I8;
 122
 123    case GL_YCBCR_MESA:
 124       if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE)
 125          return MESA_FORMAT_YCBCR;
 126       else
 127          return MESA_FORMAT_YCBCR_REV;
 128
 129    case GL_COMPRESSED_RGB_FXT1_3DFX:
 130       return MESA_FORMAT_RGB_FXT1;
 131    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 132       return MESA_FORMAT_RGBA_FXT1;
 133
 134    case GL_RGB_S3TC:
 135    case GL_RGB4_S3TC:
 136    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 137       return MESA_FORMAT_RGB_DXT1;
 138
 139    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 140       return MESA_FORMAT_RGBA_DXT1;
 141
 142    case GL_RGBA_S3TC:
 143    case GL_RGBA4_S3TC:
 144    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 145       return MESA_FORMAT_RGBA_DXT3;
 146
 147    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 148       return MESA_FORMAT_RGBA_DXT5;
 149
 150    case GL_DEPTH_COMPONENT:
 151    case GL_DEPTH_COMPONENT16:
 152    case GL_DEPTH_COMPONENT24:
 153    case GL_DEPTH_COMPONENT32:
 154 #if 0
 155       return MESA_FORMAT_Z16;
 156 #else
 157       /* fall-through.
 158        * 16bpp depth texture can't be paired with a stencil buffer so
 159        * always used combined depth/stencil format.
 160        */
 161 #endif
 162    case GL_DEPTH_STENCIL_EXT:
 163    case GL_DEPTH24_STENCIL8_EXT:
 164       return MESA_FORMAT_S8_Z24;
 165
 166 #ifndef I915
 167    case GL_SRGB_EXT:
 168    case GL_SRGB8_EXT:
 169    case GL_SRGB_ALPHA_EXT:
 170    case GL_SRGB8_ALPHA8_EXT:
 171    case GL_COMPRESSED_SRGB_EXT:
 172    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 173    case GL_COMPRESSED_SLUMINANCE_EXT:
 174    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 175       return MESA_FORMAT_SARGB8;
 176    case GL_SLUMINANCE_EXT:
 177    case GL_SLUMINANCE8_EXT:
 178       if (IS_G4X(intel->intelScreen->deviceID))
 179          return MESA_FORMAT_SL8;
 180       else
 181          return MESA_FORMAT_SARGB8;
 182    case GL_SLUMINANCE_ALPHA_EXT:
 183    case GL_SLUMINANCE8_ALPHA8_EXT:
 184       if (IS_G4X(intel->intelScreen->deviceID))
 185          return MESA_FORMAT_SLA8;
 186       else
 187          return MESA_FORMAT_SARGB8;
 188    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 189    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 190    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 191    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 192       return MESA_FORMAT_SRGB_DXT1;
 193
 194    /* i915 could also do this */
 195    case GL_DUDV_ATI:
 196    case GL_DU8DV8_ATI:
 197       return MESA_FORMAT_DUDV8;
 198    case GL_RGBA_SNORM:
 199    case GL_RGBA8_SNORM:
 200       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 201 #endif
 202
 203    default:
 204       fprintf(stderr, "unexpected texture format %s in %s\n",
 205               _mesa_lookup_enum_by_nr(internalFormat), __FUNCTION__);
 206       return MESA_FORMAT_NONE;
 207    }
 208
 209    return MESA_FORMAT_NONE;       /* never get here */
 210 }
 211
 212 int intel_compressed_num_bytes(GLuint mesaFormat)
 213 {
 214    int bytes = 0;
 215    switch(mesaFormat) {
 216
 217    case MESA_FORMAT_RGB_FXT1:
 218    case MESA_FORMAT_RGBA_FXT1:
 219    case MESA_FORMAT_RGB_DXT1:
 220    case MESA_FORMAT_RGBA_DXT1:
 221      bytes = 2;
 222      break;
 223
 224    case MESA_FORMAT_RGBA_DXT3:
 225    case MESA_FORMAT_RGBA_DXT5:
 226      bytes = 4;
 227    default:
 228      break;
 229    }
 230
 231    return bytes;
 232 }