From 62c66b34303303e6786652efa611a100ae64439a Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Mon, 24 Jan 2011 19:38:52 -0700
Subject: [PATCH] mesa: plug in fallback function for
 ctx->Driver.ValidateFramebuffer()

The software renderer doesn't support GL_ALPHA, GL_LUMINANCE, etc
so we should report GL_FRAMEBUFFER_UNSUPPORTED during FBO validation.
---
 src/mesa/drivers/common/driverfuncs.c |  1 +
 src/mesa/main/fbobject.c              | 29 +++++++++++++++++++++++++++
 src/mesa/main/fbobject.h              |  3 +++
 src/mesa/main/renderbuffer.c          |  2 +-
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/common/driverfuncs.c b/src/mesa/drivers/common/driverfuncs.c
index 3c6ecb83f0a..5389a500111 100644
--- a/src/mesa/drivers/common/driverfuncs.c
+++ b/src/mesa/drivers/common/driverfuncs.c
@@ -184,6 +184,7 @@ _mesa_init_driver_functions(struct dd_function_table *driver)
    driver->RenderTexture = _mesa_render_texture;
    driver->FinishRenderTexture = _mesa_finish_render_texture;
    driver->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
+   driver->ValidateFramebuffer = _mesa_validate_framebuffer;
 
    driver->BlitFramebuffer = _swrast_BlitFramebuffer;
 
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index ff9dcc9ca66..17b768dc847 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -372,6 +372,35 @@ _mesa_framebuffer_renderbuffer(struct gl_context *ctx,
 }
 
 
+/**
+ * Fallback for ctx->Driver.ValidateFramebuffer()
+ * Check if the renderbuffer's formats are supported by the software
+ * renderer.
+ * Drivers should probably override this.
+ */
+void
+_mesa_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
+{
+   gl_buffer_index buf;
+   for (buf = 0; buf < BUFFER_COUNT; buf++) {
+      const struct gl_renderbuffer *rb = fb->Attachment[buf].Renderbuffer;
+      if (rb) {
+         switch (rb->_BaseFormat) {
+         case GL_ALPHA:
+         case GL_LUMINANCE_ALPHA:
+         case GL_LUMINANCE:
+         case GL_INTENSITY:
+            fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED;
+            return;
+         default:
+            /* render buffer format is supported by software rendering */
+            ;
+         }
+      }
+   }
+}
+
+
 /**
  * For debug only.
  */
diff --git a/src/mesa/main/fbobject.h b/src/mesa/main/fbobject.h
index 8763f99c4a7..ba74a95b74c 100644
--- a/src/mesa/main/fbobject.h
+++ b/src/mesa/main/fbobject.h
@@ -68,6 +68,9 @@ extern void
 _mesa_framebuffer_renderbuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
                                GLenum attachment, struct gl_renderbuffer *rb);
 
+extern void
+_mesa_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb);
+
 extern void
 _mesa_test_framebuffer_completeness(struct gl_context *ctx, struct gl_framebuffer *fb);
 
diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c
index 23c662bab7f..67ee589d776 100644
--- a/src/mesa/main/renderbuffer.c
+++ b/src/mesa/main/renderbuffer.c
@@ -1086,7 +1086,7 @@ _mesa_soft_renderbuffer_storage(struct gl_context *ctx, struct gl_renderbuffer *
       pixelSize = sizeof(GLuint);
       break;
    default:
-      _mesa_problem(ctx, "Bad internalFormat in _mesa_soft_renderbuffer_storage");
+      /* unsupported format */
       return GL_FALSE;
    }
 
-- 
2.30.2