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       return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_RGB565;
  54
  55    case GL_RGBA8:
  56    case GL_RGB10_A2:
  57    case GL_RGBA12:
  58    case GL_RGBA16:
  59       return do32bpt ? MESA_FORMAT_ARGB8888 : MESA_FORMAT_ARGB4444;
  60
  61    case GL_RGBA4:
  62    case GL_RGBA2:
  63       return MESA_FORMAT_ARGB4444;
  64
  65    case GL_RGB5_A1:
  66       return MESA_FORMAT_ARGB1555;
  67
  68    case GL_RGB8:
  69    case GL_RGB10:
  70    case GL_RGB12:
  71    case GL_RGB16:
  72       return MESA_FORMAT_ARGB8888;
  73
  74    case GL_RGB5:
  75    case GL_RGB4:
  76    case GL_R3_G3_B2:
  77       return MESA_FORMAT_RGB565;
  78
  79    case GL_ALPHA:
  80    case GL_ALPHA4:
  81    case GL_ALPHA8:
  82    case GL_ALPHA12:
  83    case GL_ALPHA16:
  84    case GL_COMPRESSED_ALPHA:
  85       return MESA_FORMAT_A8;
  86
  87    case 1:
  88    case GL_LUMINANCE:
  89    case GL_LUMINANCE4:
  90    case GL_LUMINANCE8:
  91    case GL_LUMINANCE12:
  92    case GL_LUMINANCE16:
  93    case GL_COMPRESSED_LUMINANCE:
  94       return MESA_FORMAT_L8;
  95
  96    case 2:
  97    case GL_LUMINANCE_ALPHA:
  98    case GL_LUMINANCE4_ALPHA4:
  99    case GL_LUMINANCE6_ALPHA2:
 100    case GL_LUMINANCE8_ALPHA8:
 101    case GL_LUMINANCE12_ALPHA4:
 102    case GL_LUMINANCE12_ALPHA12:
 103    case GL_LUMINANCE16_ALPHA16:
 104    case GL_COMPRESSED_LUMINANCE_ALPHA:
 105       return MESA_FORMAT_AL88;
 106
 107    case GL_INTENSITY:
 108    case GL_INTENSITY4:
 109    case GL_INTENSITY8:
 110    case GL_INTENSITY12:
 111    case GL_INTENSITY16:
 112    case GL_COMPRESSED_INTENSITY:
 113       return MESA_FORMAT_I8;
 114
 115    case GL_YCBCR_MESA:
 116       if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE)
 117          return MESA_FORMAT_YCBCR;
 118       else
 119          return MESA_FORMAT_YCBCR_REV;
 120
 121    case GL_COMPRESSED_RGB_FXT1_3DFX:
 122       return MESA_FORMAT_RGB_FXT1;
 123    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 124       return MESA_FORMAT_RGBA_FXT1;
 125
 126    case GL_RGB_S3TC:
 127    case GL_RGB4_S3TC:
 128    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 129       return MESA_FORMAT_RGB_DXT1;
 130
 131    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 132       return MESA_FORMAT_RGBA_DXT1;
 133
 134    case GL_RGBA_S3TC:
 135    case GL_RGBA4_S3TC:
 136    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 137       return MESA_FORMAT_RGBA_DXT3;
 138
 139    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 140       return MESA_FORMAT_RGBA_DXT5;
 141
 142    case GL_DEPTH_COMPONENT:
 143    case GL_DEPTH_COMPONENT16:
 144    case GL_DEPTH_COMPONENT24:
 145    case GL_DEPTH_COMPONENT32:
 146 #if 0
 147       return MESA_FORMAT_Z16;
 148 #else
 149       /* fall-through.
 150        * 16bpp depth texture can't be paired with a stencil buffer so
 151        * always used combined depth/stencil format.
 152        */
 153 #endif
 154    case GL_DEPTH_STENCIL_EXT:
 155    case GL_DEPTH24_STENCIL8_EXT:
 156       return MESA_FORMAT_S8_Z24;
 157
 158 #ifndef I915
 159    case GL_SRGB_EXT:
 160    case GL_SRGB8_EXT:
 161    case GL_SRGB_ALPHA_EXT:
 162    case GL_SRGB8_ALPHA8_EXT:
 163    case GL_COMPRESSED_SRGB_EXT:
 164    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 165    case GL_COMPRESSED_SLUMINANCE_EXT:
 166    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 167       return MESA_FORMAT_SARGB8;
 168    case GL_SLUMINANCE_EXT:
 169    case GL_SLUMINANCE8_EXT:
 170       if (IS_G4X(intel->intelScreen->deviceID))
 171          return MESA_FORMAT_SL8;
 172       else
 173          return MESA_FORMAT_SARGB8;
 174    case GL_SLUMINANCE_ALPHA_EXT:
 175    case GL_SLUMINANCE8_ALPHA8_EXT:
 176       if (IS_G4X(intel->intelScreen->deviceID))
 177          return MESA_FORMAT_SLA8;
 178       else
 179          return MESA_FORMAT_SARGB8;
 180    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 181    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 182    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 183    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 184       return MESA_FORMAT_SRGB_DXT1;
 185
 186    /* i915 could also do this */
 187    case GL_DUDV_ATI:
 188    case GL_DU8DV8_ATI:
 189       return MESA_FORMAT_DUDV8;
 190    case GL_RGBA_SNORM:
 191    case GL_RGBA8_SNORM:
 192       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 193 #endif
 194
 195    default:
 196       fprintf(stderr, "unexpected texture format %s in %s\n",
 197               _mesa_lookup_enum_by_nr(internalFormat), __FUNCTION__);
 198       return MESA_FORMAT_NONE;
 199    }
 200
 201    return MESA_FORMAT_NONE;       /* never get here */
 202 }
 203
 204 int intel_compressed_num_bytes(GLuint mesaFormat)
 205 {
 206    int bytes = 0;
 207    switch(mesaFormat) {
 208
 209    case MESA_FORMAT_RGB_FXT1:
 210    case MESA_FORMAT_RGBA_FXT1:
 211    case MESA_FORMAT_RGB_DXT1:
 212    case MESA_FORMAT_RGBA_DXT1:
 213      bytes = 2;
 214      break;
 215
 216    case MESA_FORMAT_RGBA_DXT3:
 217    case MESA_FORMAT_RGBA_DXT5:
 218      bytes = 4;
 219    default:
 220      break;
 221    }
 222
 223    return bytes;
 224 }