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