texstore.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

               GLvoid *dstAddr,
               GLint dstXoffset, GLint dstYoffset, GLint dstZoffset,
               GLint dstRowStride, GLint dstImageStride,
               GLint srcWidth, GLint srcHeight, GLint srcDepth,
               GLenum srcFormat, GLenum srcType,
               const GLvoid *srcAddr,
               const struct gl_pixelstore_attrib *srcPacking)
{
   const GLint srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth,
                                                     srcFormat, srcType);
   const GLint srcImageStride = _mesa_image_image_stride(srcPacking,
                                      srcWidth, srcHeight, srcFormat, srcType);
   const GLubyte *srcImage = (const GLubyte *) _mesa_image_address(dimensions,
        srcPacking, srcAddr, srcWidth, srcHeight, srcFormat, srcType, 0, 0, 0);
   const GLint bytesPerRow = srcWidth * dstFormat->TexelBytes;
   const GLint bytesPerImage = srcHeight * bytesPerRow;
   const GLint bytesPerTexture = srcDepth * bytesPerImage;
   GLubyte *dstImage = (GLubyte *) dstAddr
                     + dstZoffset * dstImageStride
                     + dstYoffset * dstRowStride
                     + dstXoffset * dstFormat->TexelBytes;

   if (dstRowStride == srcRowStride &&
       dstRowStride == bytesPerRow &&
       ((dstImageStride == srcImageStride &&
         dstImageStride == bytesPerImage) ||
        (srcDepth == 1))) {
      /* one big memcpy */
      ctx->Driver.TextureMemCpy(dstImage, srcImage, bytesPerTexture);
   }
   else {
      GLint img, row;
      for (img = 0; img < srcDepth; img++) {
         const GLubyte *srcRow = srcImage;
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            ctx->Driver.TextureMemCpy(dstRow, srcRow, bytesPerRow);
            dstRow += dstRowStride;
            srcRow += srcRowStride;
         }
         srcImage += srcImageStride;
         dstImage += dstImageStride;
      }
   }
}



/**
 * Store an image in any of the formats:
 *   _mesa_texformat_rgba
 *   _mesa_texformat_rgb
 *   _mesa_texformat_alpha
 *   _mesa_texformat_luminance
 *   _mesa_texformat_luminance_alpha
 *   _mesa_texformat_intensity
 * 
 * \param dims  either 1 or 2 or 3
 * \param baseInternalFormat  user-specified base internal format
 * \param dstFormat  destination Mesa texture format
 * \param dstAddr  destination image address
 * \param dstX/Y/Zoffset  destination x/y/z offset (ala TexSubImage), in texels
 * \param dstRowStride  destination image row stride, in bytes
 * \param dstImageStride  destination image layer stride, in bytes
 * \param srcWidth/Height/Depth  source image size, in pixels
 * \param srcFormat  incoming image format
 * \param srcType  incoming image data type
 * \param srcAddr  source image address
 * \param srcPacking  source image packing parameters
 */
GLboolean
_mesa_texstore_rgba(GLcontext *ctx, GLuint dims,
                    GLenum baseInternalFormat,
                    const struct gl_texture_format *dstFormat,
                    GLvoid *dstAddr,
                    GLint dstXoffset, GLint dstYoffset, GLint dstZoffset,
                    GLint dstRowStride, GLint dstImageStride,
                    GLint srcWidth, GLint srcHeight, GLint srcDepth,
                    GLenum srcFormat, GLenum srcType,
                    const GLvoid *srcAddr,
                    const struct gl_pixelstore_attrib *srcPacking)
{
   const GLint components = _mesa_components_in_format(baseInternalFormat);

   ASSERT(dstFormat == &_mesa_texformat_rgba ||
          dstFormat == &_mesa_texformat_rgb ||
          dstFormat == &_mesa_texformat_alpha ||
          dstFormat == &_mesa_texformat_luminance ||
          dstFormat == &_mesa_texformat_luminance_alpha ||
          dstFormat == &_mesa_texformat_intensity);
   ASSERT(baseInternalFormat == GL_RGBA ||
          baseInternalFormat == GL_RGB ||
          baseInternalFormat == GL_ALPHA ||
          baseInternalFormat == GL_LUMINANCE ||
          baseInternalFormat == GL_LUMINANCE_ALPHA ||
          baseInternalFormat == GL_INTENSITY);
   ASSERT(dstFormat->TexelBytes == components * sizeof(GLchan));

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       baseInternalFormat == srcFormat &&
       srcType == CHAN_TYPE) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else if (!ctx->_ImageTransferState &&
            !srcPacking->SwapBytes &&
            dstFormat == &_mesa_texformat_rgb &&
            srcFormat == GL_RGBA &&
            srcType == CHAN_TYPE) {
      /* extract RGB from RGBA */
      int img, row, col;
      GLchan *dstImage = (GLchan *) (GLubyte *) dstAddr
                       + dstZoffset * dstImageStride
                       + dstYoffset * dstRowStride
                       + dstXoffset * dstFormat->TexelBytes;
      for (img = 0; img < srcDepth; img++) {
         const GLint srcRowStride = _mesa_image_row_stride(srcPacking,
                                                 srcWidth, srcFormat, srcType);
         GLchan *srcRow = (GLchan *) _mesa_image_address(dims, srcPacking,
                  srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, 0, 0);
         GLchan *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            for (col = 0; col < srcWidth; col++) {
               dstRow[col * 3 + RCOMP] = srcRow[col * 4 + RCOMP];
               dstRow[col * 3 + GCOMP] = srcRow[col * 4 + GCOMP];
               dstRow[col * 3 + BCOMP] = srcRow[col * 4 + BCOMP];
            }
            dstRow += dstRowStride;
            srcRow = (GLchan *) ((GLubyte *) srcRow + srcRowStride);
         }
         dstImage += dstImageStride;
      }
   }
   else {
      /* general path */
      const GLchan *tempImage = _mesa_make_temp_chan_image(ctx, dims,
                                                 baseInternalFormat,
                                                 dstFormat->BaseFormat,
                                                 srcWidth, srcHeight, srcDepth,
                                                 srcFormat, srcType, srcAddr,
                                                 srcPacking);
      const GLchan *src = tempImage;
      GLint bytesPerRow;
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row;
      if (!tempImage)
         return GL_FALSE;
      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
      bytesPerRow = srcWidth * components * sizeof(GLchan);
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            _mesa_memcpy(dstRow, src, bytesPerRow);
            dstRow += dstRowStride;
            src += srcWidth * components;
         }
         dstImage += dstImageStride;
      }

      _mesa_free((void *) tempImage);
   }
   return GL_TRUE;
}


/**
 * Store a floating point depth component texture image.
 */
GLboolean
_mesa_texstore_depth_component_float32(STORE_PARAMS)
{
   (void) dims;
   ASSERT(dstFormat == &_mesa_texformat_depth_component_float32);
   ASSERT(dstFormat->TexelBytes == sizeof(GLfloat));

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       baseInternalFormat == GL_DEPTH_COMPONENT &&
       srcFormat == GL_DEPTH_COMPONENT &&
       srcType == GL_FLOAT) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else {
      /* general path */
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row;
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            const GLvoid *src = _mesa_image_address(dims, srcPacking,
                srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
            _mesa_unpack_depth_span(ctx, srcWidth, (GLfloat *) dstRow,
                                    srcType, src, srcPacking);
            dstRow += dstRowStride;
         }
         dstImage += dstImageStride;
      }
   }
   return GL_TRUE;
}


/**
 * Store a 16-bit integer depth component texture image.
 */
GLboolean
_mesa_texstore_depth_component16(STORE_PARAMS)
{
   (void) dims;
   ASSERT(dstFormat == &_mesa_texformat_depth_component16);
   ASSERT(dstFormat->TexelBytes == sizeof(GLushort));

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       baseInternalFormat == GL_DEPTH_COMPONENT &&
       srcFormat == GL_DEPTH_COMPONENT &&
       srcType == GL_UNSIGNED_SHORT) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else {
      /* general path */
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row, col;
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            GLfloat depthTemp[MAX_WIDTH];
            const GLvoid *src = _mesa_image_address(dims, srcPacking,
                srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
            GLushort *dst16 = (GLushort *) dstRow;
            _mesa_unpack_depth_span(ctx, srcWidth, depthTemp,
                                    srcType, src, srcPacking);
            for (col = 0; col < srcWidth; col++) {
               dst16[col] = (GLushort) (depthTemp[col] * 65535.0F);
            }
            dstRow += dstRowStride;
         }
         dstImage += dstImageStride;
      }
   }
   return GL_TRUE;
}


/**
 * Store an rgb565 or rgb565_rev texture image.
 */
GLboolean
_mesa_texstore_rgb565(STORE_PARAMS)
{
   ASSERT(dstFormat == &_mesa_texformat_rgb565 ||
          dstFormat == &_mesa_texformat_rgb565_rev);
   ASSERT(dstFormat->TexelBytes == 2);

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       dstFormat == &_mesa_texformat_rgb565 &&
       baseInternalFormat == GL_RGB &&
       srcFormat == GL_RGB &&
       srcType == GL_UNSIGNED_SHORT_5_6_5) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else if (!ctx->_ImageTransferState &&
            !srcPacking->SwapBytes &&
            baseInternalFormat == GL_RGB &&
            srcFormat == GL_RGB &&
            srcType == GL_UNSIGNED_BYTE &&
            dims == 2) {
      /* do optimized tex store */
      const GLint srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth,
                                                        srcFormat, srcType);
      const GLubyte *src = (const GLubyte *)
         _mesa_image_address(dims, srcPacking, srcAddr, srcWidth, srcHeight,
                             srcFormat, srcType, 0, 0, 0);
      GLubyte *dst = (GLubyte *) dstAddr
                   + dstZoffset * dstImageStride
                   + dstYoffset * dstRowStride
                   + dstXoffset * dstFormat->TexelBytes;
      GLint row, col;
      for (row = 0; row < srcHeight; row++) {
         const GLubyte *srcUB = (const GLubyte *) src;
         GLushort *dstUS = (GLushort *) dst;
         /* check for byteswapped format */
         if (dstFormat == &_mesa_texformat_rgb565) {
            for (col = 0; col < srcWidth; col++) {
               dstUS[col] = PACK_COLOR_565( srcUB[0], srcUB[1], srcUB[2] );
               srcUB += 3;
            }
         }
         else {
            for (col = 0; col < srcWidth; col++) {
               dstUS[col] = PACK_COLOR_565_REV( srcUB[0], srcUB[1], srcUB[2] );
               srcUB += 3;
            }
         }
         dst += dstRowStride;
         src += srcRowStride;
      }
   }
   else {
      /* general path */
      const GLchan *tempImage = _mesa_make_temp_chan_image(ctx, dims,
                                                 baseInternalFormat,
                                                 dstFormat->BaseFormat,
                                                 srcWidth, srcHeight, srcDepth,
                                                 srcFormat, srcType, srcAddr,
                                                 srcPacking);
      const GLchan *src = tempImage;
      GLubyte *dstImage = (GLubyte *) dstAddr