Merge branch 'mesa_7_5_branch'

[mesa.git] / src / mesa / main / readpix.c

diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index dc22808e5bbb3254623b0e4352290795f2e6cefb..2326776ecbfb4efbf1ce149649aeed4246e3f7bf 100644 (file)
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -105,8 +105,7 @@ _mesa_error_check_format_type(GLcontext *ctx, GLenum format, GLenum type,
       }
       break;
    case GL_DEPTH_COMPONENT:
-      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
-          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
+      if ((drawing && !_mesa_dest_buffer_exists(ctx, format))) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "gl%sPixels(no depth buffer)", readDraw);
          return GL_TRUE;
@@ -171,6 +170,9 @@ _mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
       return;
    }
 
+   if (width == 0 || height == 0)
+      return; /* nothing to do */
+
    if (ctx->Pack.BufferObj->Name) {
       if (!_mesa_validate_pbo_access(2, &ctx->Pack, width, height, 1,
                                      format, type, pixels)) {