image.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

                  for (i=0;i<n;i++) {
                     dst[i*4+0] = FLOAT_TO_UINT(rgba[i][BCOMP]);
                     dst[i*4+1] = FLOAT_TO_UINT(rgba[i][GCOMP]);
                     dst[i*4+2] = FLOAT_TO_UINT(rgba[i][RCOMP]);
                     dst[i*4+3] = FLOAT_TO_UINT(rgba[i][ACOMP]);
                  }
                  break;
               case GL_ABGR_EXT:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = FLOAT_TO_UINT(rgba[i][ACOMP]);
                     dst[i*4+1] = FLOAT_TO_UINT(rgba[i][BCOMP]);
                     dst[i*4+2] = FLOAT_TO_UINT(rgba[i][GCOMP]);
                     dst[i*4+3] = FLOAT_TO_UINT(rgba[i][RCOMP]);
                  }
                  break;
               default:
                  _mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
            }
         }
         break;
      case GL_INT:
         {
            GLint *dst = (GLint *) dstAddr;
            switch (dstFormat) {
               case GL_RED:
                  for (i=0;i<n;i++)
                     dst[i] = FLOAT_TO_INT(rgba[i][RCOMP]);
                  break;
               case GL_GREEN:
                  for (i=0;i<n;i++)
                     dst[i] = FLOAT_TO_INT(rgba[i][GCOMP]);
                  break;
               case GL_BLUE:
                  for (i=0;i<n;i++)
                     dst[i] = FLOAT_TO_INT(rgba[i][BCOMP]);
                  break;
               case GL_ALPHA:
                  for (i=0;i<n;i++)
                     dst[i] = FLOAT_TO_INT(rgba[i][ACOMP]);
                  break;
               case GL_LUMINANCE:
                  for (i=0;i<n;i++)
                     dst[i] = FLOAT_TO_INT(luminance[i]);
                  break;
               case GL_LUMINANCE_ALPHA:
                  for (i=0;i<n;i++) {
                     dst[i*2+0] = FLOAT_TO_INT(luminance[i]);
                     dst[i*2+1] = FLOAT_TO_INT(rgba[i][ACOMP]);
                  }
                  break;
               case GL_RGB:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = FLOAT_TO_INT(rgba[i][RCOMP]);
                     dst[i*3+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
                     dst[i*3+2] = FLOAT_TO_INT(rgba[i][BCOMP]);
                  }
                  break;
               case GL_RGBA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = FLOAT_TO_INT(rgba[i][RCOMP]);
                     dst[i*4+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
                     dst[i*4+2] = FLOAT_TO_INT(rgba[i][BCOMP]);
                     dst[i*4+3] = FLOAT_TO_INT(rgba[i][ACOMP]);
                  }
                  break;
               case GL_BGR:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = FLOAT_TO_INT(rgba[i][BCOMP]);
                     dst[i*3+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
                     dst[i*3+2] = FLOAT_TO_INT(rgba[i][RCOMP]);
                  }
                  break;
               case GL_BGRA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = FLOAT_TO_INT(rgba[i][BCOMP]);
                     dst[i*4+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
                     dst[i*4+2] = FLOAT_TO_INT(rgba[i][RCOMP]);
                     dst[i*4+3] = FLOAT_TO_INT(rgba[i][ACOMP]);
                  }
                  break;
               case GL_ABGR_EXT:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = FLOAT_TO_INT(rgba[i][ACOMP]);
                     dst[i*4+1] = FLOAT_TO_INT(rgba[i][BCOMP]);
                     dst[i*4+2] = FLOAT_TO_INT(rgba[i][GCOMP]);
                     dst[i*4+3] = FLOAT_TO_INT(rgba[i][RCOMP]);
                  }
                  break;
               default:
                  _mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
            }
         }
         break;
      case GL_FLOAT:
         {
            GLfloat *dst = (GLfloat *) dstAddr;
            switch (dstFormat) {
               case GL_RED:
                  for (i=0;i<n;i++)
                     dst[i] = rgba[i][RCOMP];
                  break;
               case GL_GREEN:
                  for (i=0;i<n;i++)
                     dst[i] = rgba[i][GCOMP];
                  break;
               case GL_BLUE:
                  for (i=0;i<n;i++)
                     dst[i] = rgba[i][BCOMP];
                  break;
               case GL_ALPHA:
                  for (i=0;i<n;i++)
                     dst[i] = rgba[i][ACOMP];
                  break;
               case GL_LUMINANCE:
                  for (i=0;i<n;i++)
                     dst[i] = luminance[i];
                  break;
               case GL_LUMINANCE_ALPHA:
                  for (i=0;i<n;i++) {
                     dst[i*2+0] = luminance[i];
                     dst[i*2+1] = rgba[i][ACOMP];
                  }
                  break;
               case GL_RGB:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = rgba[i][RCOMP];
                     dst[i*3+1] = rgba[i][GCOMP];
                     dst[i*3+2] = rgba[i][BCOMP];
                  }
                  break;
               case GL_RGBA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = rgba[i][RCOMP];
                     dst[i*4+1] = rgba[i][GCOMP];
                     dst[i*4+2] = rgba[i][BCOMP];
                     dst[i*4+3] = rgba[i][ACOMP];
                  }
                  break;
               case GL_BGR:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = rgba[i][BCOMP];
                     dst[i*3+1] = rgba[i][GCOMP];
                     dst[i*3+2] = rgba[i][RCOMP];
                  }
                  break;
               case GL_BGRA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = rgba[i][BCOMP];
                     dst[i*4+1] = rgba[i][GCOMP];
                     dst[i*4+2] = rgba[i][RCOMP];
                     dst[i*4+3] = rgba[i][ACOMP];
                  }
                  break;
               case GL_ABGR_EXT:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = rgba[i][ACOMP];
                     dst[i*4+1] = rgba[i][BCOMP];
                     dst[i*4+2] = rgba[i][GCOMP];
                     dst[i*4+3] = rgba[i][RCOMP];
                  }
                  break;
               default:
                  _mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
            }
         }
         break;
      case GL_HALF_FLOAT_ARB:
         {
            GLhalfARB *dst = (GLhalfARB *) dstAddr;
            switch (dstFormat) {
               case GL_RED:
                  for (i=0;i<n;i++)
                     dst[i] = _mesa_float_to_half(rgba[i][RCOMP]);
                  break;
               case GL_GREEN:
                  for (i=0;i<n;i++)
                     dst[i] = _mesa_float_to_half(rgba[i][GCOMP]);
                  break;
               case GL_BLUE:
                  for (i=0;i<n;i++)
                     dst[i] = _mesa_float_to_half(rgba[i][BCOMP]);
                  break;
               case GL_ALPHA:
                  for (i=0;i<n;i++)
                     dst[i] = _mesa_float_to_half(rgba[i][ACOMP]);
                  break;
               case GL_LUMINANCE:
                  for (i=0;i<n;i++)
                     dst[i] = _mesa_float_to_half(luminance[i]);
                  break;
               case GL_LUMINANCE_ALPHA:
                  for (i=0;i<n;i++) {
                     dst[i*2+0] = _mesa_float_to_half(luminance[i]);
                     dst[i*2+1] = _mesa_float_to_half(rgba[i][ACOMP]);
                  }
                  break;
               case GL_RGB:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = _mesa_float_to_half(rgba[i][RCOMP]);
                     dst[i*3+1] = _mesa_float_to_half(rgba[i][GCOMP]);
                     dst[i*3+2] = _mesa_float_to_half(rgba[i][BCOMP]);
                  }
                  break;
               case GL_RGBA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = _mesa_float_to_half(rgba[i][RCOMP]);
                     dst[i*4+1] = _mesa_float_to_half(rgba[i][GCOMP]);
                     dst[i*4+2] = _mesa_float_to_half(rgba[i][BCOMP]);
                     dst[i*4+3] = _mesa_float_to_half(rgba[i][ACOMP]);
                  }
                  break;
               case GL_BGR:
                  for (i=0;i<n;i++) {
                     dst[i*3+0] = _mesa_float_to_half(rgba[i][BCOMP]);
                     dst[i*3+1] = _mesa_float_to_half(rgba[i][GCOMP]);
                     dst[i*3+2] = _mesa_float_to_half(rgba[i][RCOMP]);
                  }
                  break;
               case GL_BGRA:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = _mesa_float_to_half(rgba[i][BCOMP]);
                     dst[i*4+1] = _mesa_float_to_half(rgba[i][GCOMP]);
                     dst[i*4+2] = _mesa_float_to_half(rgba[i][RCOMP]);
                     dst[i*4+3] = _mesa_float_to_half(rgba[i][ACOMP]);
                  }
                  break;
               case GL_ABGR_EXT:
                  for (i=0;i<n;i++) {
                     dst[i*4+0] = _mesa_float_to_half(rgba[i][ACOMP]);
                     dst[i*4+1] = _mesa_float_to_half(rgba[i][BCOMP]);
                     dst[i*4+2] = _mesa_float_to_half(rgba[i][GCOMP]);
                     dst[i*4+3] = _mesa_float_to_half(rgba[i][RCOMP]);
                  }
                  break;
               default:
                  _mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
            }
         }
         break;
      case GL_UNSIGNED_BYTE_3_3_2:
         if (dstFormat == GL_RGB) {
            GLubyte *dst = (GLubyte *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 7.0F)) << 5)
                      | (((GLint) (rgba[i][GCOMP] * 7.0F)) << 2)
                      | (((GLint) (rgba[i][BCOMP] * 3.0F))     );
            }
         }
         break;
      case GL_UNSIGNED_BYTE_2_3_3_REV:
         if (dstFormat == GL_RGB) {
            GLubyte *dst = (GLubyte *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 7.0F))     )
                      | (((GLint) (rgba[i][GCOMP] * 7.0F)) << 3)
                      | (((GLint) (rgba[i][BCOMP] * 3.0F)) << 6);
            }
         }
         break;
      case GL_UNSIGNED_SHORT_5_6_5:
         if (dstFormat == GL_RGB) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) << 11)
                      | (((GLint) (rgba[i][GCOMP] * 63.0F)) <<  5)
                      | (((GLint) (rgba[i][BCOMP] * 31.0F))      );
            }
         }
         break;
      case GL_UNSIGNED_SHORT_5_6_5_REV:
         if (dstFormat == GL_RGB) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F))      )
                      | (((GLint) (rgba[i][GCOMP] * 63.0F)) <<  5)
                      | (((GLint) (rgba[i][BCOMP] * 31.0F)) << 11);
            }
         }
         break;
      case GL_UNSIGNED_SHORT_4_4_4_4:
         if (dstFormat == GL_RGBA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 15.0F)) << 12)
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][BCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][ACOMP] * 15.0F))      );
            }
         }
         else if (dstFormat == GL_BGRA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][BCOMP] * 15.0F)) << 12)
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][RCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][ACOMP] * 15.0F))      );
            }
         }
         else if (dstFormat == GL_ABGR_EXT) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][ACOMP] * 15.0F)) << 12)
                      | (((GLint) (rgba[i][BCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][RCOMP] * 15.0F))      );
            }
         }
         break;
      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
         if (dstFormat == GL_RGBA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 15.0F))      )
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][BCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][ACOMP] * 15.0F)) << 12);
            }
         }
         else if (dstFormat == GL_BGRA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][BCOMP] * 15.0F))      )
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][RCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][ACOMP] * 15.0F)) << 12);
            }
         }
         else if (dstFormat == GL_ABGR_EXT) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][ACOMP] * 15.0F))      )
                      | (((GLint) (rgba[i][BCOMP] * 15.0F)) <<  4)
                      | (((GLint) (rgba[i][GCOMP] * 15.0F)) <<  8)
                      | (((GLint) (rgba[i][RCOMP] * 15.0F)) << 12);
            }
         }
         break;
      case GL_UNSIGNED_SHORT_5_5_5_1:
         if (dstFormat == GL_RGBA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) << 11)
                      | (((GLint) (rgba[i][GCOMP] * 31.0F)) <<  6)
                      | (((GLint) (rgba[i][BCOMP] * 31.0F)) <<  1)
                      | (((GLint) (rgba[i][ACOMP] *  1.0F))      );
            }
         }
         else if (dstFormat == GL_BGRA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][BCOMP] * 31.0F)) << 11)
                      | (((GLint) (rgba[i][GCOMP] * 31.0F)) <<  6)
                      | (((GLint) (rgba[i][RCOMP] * 31.0F)) <<  1)
                      | (((GLint) (rgba[i][ACOMP] *  1.0F))      );
            }
         }
         else if (dstFormat == GL_ABGR_EXT) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][ACOMP] * 31.0F)) << 11)
                      | (((GLint) (rgba[i][BCOMP] * 31.0F)) <<  6)
                      | (((GLint) (rgba[i][GCOMP] * 31.0F)) <<  1)
                      | (((GLint) (rgba[i][RCOMP] *  1.0F))      );
            }
         }
         break;
      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
         if (dstFormat == GL_RGBA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F))      )
                      | (((GLint) (rgba[i][GCOMP] * 31.0F)) <<  5)
                      | (((GLint) (rgba[i][BCOMP] * 31.0F)) << 10)
                      | (((GLint) (rgba[i][ACOMP] *  1.0F)) << 15);
            }
         }
         else if (dstFormat == GL_BGRA) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               dst[i] = (((GLint) (rgba[i][BCOMP] * 31.0F))      )
                      | (((GLint) (rgba[i][GCOMP] * 31.0F)) <<  5)
                      | (((GLint) (rgba[i][RCOMP] * 31.0F)) << 10)
                      | (((GLint) (rgba[i][ACOMP] *  1.0F)) << 15);
            }
         }
         else if (dstFormat == GL_ABGR_EXT) {
            GLushort *dst = (GLushort *) dstAddr;
            for (i=0;i<n;i++) {
               d