C++ (Cpp) CLAMPED_FLOAT_TO_USHORT示例

示例#1

文件： pixel.c 项目： venkatarajasekhar/Qt

static void GLAPIENTRY
_mesa_GetnPixelMapusvARB( GLenum map, GLsizei bufSize, GLushort *values )
{
    GET_CURRENT_CONTEXT(ctx);
    GLint mapsize, i;
    const struct gl_pixelmap *pm;

    ASSERT_OUTSIDE_BEGIN_END(ctx);

    pm = get_pixelmap(ctx, map);
    if (!pm) {
        _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
        return;
    }

    mapsize = pm->Size;

    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize, GL_INTENSITY,
                             GL_UNSIGNED_SHORT, bufSize, values)) {
        return;
    }

    values = (GLushort *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
    if (!values) {
        if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glGetPixelMapusv(PBO is mapped)");
        }
        return;
    }

    switch (map) {
    /* special cases */
    case GL_PIXEL_MAP_I_TO_I:
        for (i = 0; i < mapsize; i++) {
            values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
        }
        break;
    case GL_PIXEL_MAP_S_TO_S:
        for (i = 0; i < mapsize; i++) {
            values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
        }
        break;
    default:
        for (i = 0; i < mapsize; i++) {
            CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
        }
    }

    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
}

示例#2

文件： pixel.c 项目： GYGit/reactos

static void GLAPIENTRY
_mesa_GetPixelMapusv( GLenum map, GLushort *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   const struct gl_pixelmap *pm;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   pm = get_pixelmap(ctx, map);
   if (!pm) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
      return;
   }

   mapsize = pm->Size;

   if (!values) {
      return;
   }

   switch (map) {
   /* special cases */
   case GL_PIXEL_MAP_I_TO_I:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
      }
      break;
   case GL_PIXEL_MAP_S_TO_S:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
      }
      break;
   default:
      for (i = 0; i < mapsize; i++) {
         CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
      }
   }
}

示例#3

文件： pixel.c 项目： astrofimov/vgallium

void GLAPIENTRY
_mesa_GetPixelMapusv( GLenum map, GLushort *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   const struct gl_pixelmap *pm;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   pm = get_pixelmap(ctx, map);
   if (!pm) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
      return;
   }
   mapsize = pm ? pm->Size : 0;

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_SHORT,
                                     values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapusv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapusv(PBO is mapped)");
         return;
      }
      values = (GLushort *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   switch (map) {
   /* special cases */
   case GL_PIXEL_MAP_I_TO_I:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
      }
      break;
   case GL_PIXEL_MAP_S_TO_S:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
      }
      break;
   default:
      for (i = 0; i < mapsize; i++) {
         CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
      }
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}