meta: Use the DrawBuffer's stencil size

Previously the code was erroneously using the stencil size of the
context instead of the stencil size of the DrawBuffer.  With FBOs
these may be different.  As a result, clearing the stencil buffer of
an FBO bound to a context that doesn't have stencil would fail.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 8e229bbe388848662c50a858a422abda4bdbf31a..b97b760f1815da03e06705b28836100765e86d11 100644 (file)
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -1895,7 +1895,7 @@ _mesa_meta_DrawPixels(GLcontext *ctx,
       _mesa_BindProgram(GL_FRAGMENT_PROGRAM_ARB, drawpix->StencilFP);
       _mesa_set_enable(ctx, GL_FRAGMENT_PROGRAM_ARB, GL_TRUE);
 
-      for (bit = 0; bit < ctx->Visual.stencilBits; bit++) {
+      for (bit = 0; bit < ctx->DrawBuffer->Visual.stencilBits; bit++) {
          const GLuint mask = 1 << bit;
          if (mask & origStencilMask) {
             _mesa_StencilFunc(GL_ALWAYS, mask, mask);