C++ (Cpp) _mesa_unpack_uint_24_8_depth_stencil_row Examples

Example #1

/**
 * glGetTexImage for depth/stencil pixels.
 */
static void
get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,
                      GLenum format, GLenum type, GLvoid *pixels,
                      struct gl_texture_image *texImage)
{
   const GLint width = texImage->Width;
   const GLint height = texImage->Height;
   const GLint depth = texImage->Depth;
   GLint img, row;

   assert(format == GL_DEPTH_STENCIL);
   assert(type == GL_UNSIGNED_INT_24_8);
   /* XXX type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV is not handled yet */

   for (img = 0; img < depth; img++) {
      GLubyte *srcMap;
      GLint rowstride;

      /* map src texture buffer */
      ctx->Driver.MapTextureImage(ctx, texImage, img,
                                  0, 0, width, height, GL_MAP_READ_BIT,
                                  &srcMap, &rowstride);

      if (srcMap) {
         for (row = 0; row < height; row++) {
            const GLubyte *src = srcMap + row * rowstride;
            void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
                                             width, height, format, type,
                                             img, row, 0);
            /* Unpack from texture's format to GL's z24_s8 layout */
            _mesa_unpack_uint_24_8_depth_stencil_row(texImage->TexFormat,
                                                     width,
                                                     (const GLuint *) src,
                                                     dest);
            if (ctx->Pack.SwapBytes) {
               _mesa_swap4((GLuint *) dest, width);
            }
         }

         ctx->Driver.UnmapTextureImage(ctx, texImage, img);
      }
      else {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
         break;
      }
   }
}

Example #2

/**
 * For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
 * data (possibly swapping 8/24 vs 24/8 as we go).
 */
static GLboolean
fast_read_depth_stencil_pixels(struct gl_context *ctx,
			       GLint x, GLint y,
			       GLsizei width, GLsizei height,
			       GLubyte *dst, int dstStride)
{
   struct gl_framebuffer *fb = ctx->ReadBuffer;
   struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
   struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
   GLubyte *map;
   int stride, i;

   if (rb != stencilRb)
      return GL_FALSE;

   if (rb->Format != MESA_FORMAT_S8_UINT_Z24_UNORM &&
       rb->Format != MESA_FORMAT_Z24_UNORM_S8_UINT)
      return GL_FALSE;

   ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
			       &map, &stride);
   if (!map) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
      return GL_TRUE;  /* don't bother trying the slow path */
   }

   for (i = 0; i < height; i++) {
      _mesa_unpack_uint_24_8_depth_stencil_row(rb->Format, width,
					       map, (GLuint *)dst);
      map += stride;
      dst += dstStride;
   }

   ctx->Driver.UnmapRenderbuffer(ctx, rb);

   return GL_TRUE;
}