mesa: generate GL_INVALID_OPERATION for missing z/stencil when blitting

If glBlitFramebuffer() is called with GL_DEPTH_BUFFER_BIT or
GL_STENCIL_BUFFER_BIT and the src/dst depth/stencil buffers are absent,
report an error.

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 83301f1e621156369312cddf5fb8e683f84e1631..ab91fbc4de901d0c4d3a96b80b8711ec405dca85 100644 (file)
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -2038,7 +2038,9 @@ _mesa_BlitFramebufferEXT(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
    if (mask & GL_STENCIL_BUFFER_BIT) {
       struct gl_renderbuffer *readRb = readFb->_StencilBuffer;
       struct gl_renderbuffer *drawRb = drawFb->_StencilBuffer;
-      if (readRb->StencilBits != drawRb->StencilBits) {
+      if (!readRb ||
+          !drawRb ||
+          readRb->StencilBits != drawRb->StencilBits) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glBlitFramebufferEXT(stencil buffer size mismatch");
          return;
@@ -2048,7 +2050,9 @@ _mesa_BlitFramebufferEXT(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
    if (mask & GL_DEPTH_BUFFER_BIT) {
       struct gl_renderbuffer *readRb = readFb->_DepthBuffer;
       struct gl_renderbuffer *drawRb = drawFb->_DepthBuffer;
-      if (readRb->DepthBits != drawRb->DepthBits) {
+      if (!readRb ||
+          !drawRb ||
+          readRb->DepthBits != drawRb->DepthBits) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glBlitFramebufferEXT(depth buffer size mismatch");
          return;