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authorBrian Paul <brian.paul@tungstengraphics.com>2006-03-20 15:25:18 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2006-03-20 15:25:18 +0000
commit7275d4d097f97a2154dfe8fa573dc193cb5b4bf1 (patch)
tree38e5601df52558933a47ecadf7b8a1c376fd7bbf /src/mesa
parentf1038f81e40fe7cd7eddfd64d1c4f3dc0a1a074b (diff)
added _mesa_source/dest_buffer_exists() function to easily test if particular renderbuffers are present
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/main/framebuffer.c123
-rw-r--r--src/mesa/main/framebuffer.h9
2 files changed, 130 insertions, 2 deletions
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 17241cfcef..26e72da3f7 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -2,7 +2,7 @@
* Mesa 3-D graphics library
* Version: 6.5
*
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -550,3 +550,124 @@ _mesa_update_framebuffer(GLcontext *ctx)
compute_depth_max(fb);
}
+
+
+/**
+ * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
+ * glCopyTex[Sub]Image, etc. exists.
+ * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
+ * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
+ * \return GL_TRUE if buffer exists, GL_FALSE otherwise
+ */
+GLboolean
+_mesa_source_buffer_exists(GLcontext *ctx, GLenum format)
+{
+ const struct gl_renderbuffer_attachment *att
+ = ctx->ReadBuffer->Attachment;
+
+ if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ return GL_FALSE;
+ }
+
+ switch (format) {
+ case GL_COLOR:
+ case GL_ALPHA:
+ case GL_LUMINANCE:
+ case GL_LUMINANCE_ALPHA:
+ case GL_INTENSITY:
+ case GL_RGB:
+ case GL_RGBA:
+ case GL_COLOR_INDEX:
+ if (ctx->ReadBuffer->_ColorReadBuffer == NULL) {
+ return GL_FALSE;
+ }
+ break;
+ case GL_DEPTH:
+ case GL_DEPTH_COMPONENT:
+ if (!att[BUFFER_DEPTH].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0);
+ break;
+ case GL_STENCIL:
+ case GL_STENCIL_INDEX:
+ if (!att[BUFFER_STENCIL].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0);
+ break;
+ case GL_DEPTH_STENCIL_EXT:
+ if (!att[BUFFER_DEPTH].Renderbuffer ||
+ !att[BUFFER_STENCIL].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0);
+ ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0);
+ break;
+ default:
+ _mesa_problem(ctx,
+ "Unexpected format 0x%x in _mesa_source_buffer_exists");
+ return GL_FALSE;
+ }
+
+ /* OK */
+ return GL_TRUE;
+}
+
+
+/**
+ * As above, but for drawing operations.
+ * XXX code do some code merging w/ above function.
+ */
+GLboolean
+_mesa_dest_buffer_exists(GLcontext *ctx, GLenum format)
+{
+ const struct gl_renderbuffer_attachment *att
+ = ctx->ReadBuffer->Attachment;
+
+ if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ return GL_FALSE;
+ }
+
+ switch (format) {
+ case GL_COLOR:
+ case GL_ALPHA:
+ case GL_LUMINANCE:
+ case GL_LUMINANCE_ALPHA:
+ case GL_INTENSITY:
+ case GL_RGB:
+ case GL_RGBA:
+ case GL_COLOR_INDEX:
+ /* nothing special */
+ break;
+ case GL_DEPTH:
+ case GL_DEPTH_COMPONENT:
+ if (!att[BUFFER_DEPTH].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0);
+ break;
+ case GL_STENCIL:
+ case GL_STENCIL_INDEX:
+ if (!att[BUFFER_STENCIL].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0);
+ break;
+ case GL_DEPTH_STENCIL_EXT:
+ if (!att[BUFFER_DEPTH].Renderbuffer ||
+ !att[BUFFER_STENCIL].Renderbuffer) {
+ return GL_FALSE;
+ }
+ ASSERT(att[BUFFER_DEPTH].Renderbuffer->DepthBits > 0);
+ ASSERT(att[BUFFER_STENCIL].Renderbuffer->StencilBits > 0);
+ break;
+ default:
+ _mesa_problem(ctx,
+ "Unexpected format 0x%x in _mesa_source_buffer_exists");
+ return GL_FALSE;
+ }
+
+ /* OK */
+ return GL_TRUE;
+}
diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h
index fcc493c193..51847b07c0 100644
--- a/src/mesa/main/framebuffer.h
+++ b/src/mesa/main/framebuffer.h
@@ -2,7 +2,7 @@
* Mesa 3-D graphics library
* Version: 6.5
*
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -55,4 +55,11 @@ _mesa_update_framebuffer_visual(struct gl_framebuffer *fb);
extern void
_mesa_update_framebuffer(GLcontext *ctx);
+extern GLboolean
+_mesa_source_buffer_exists(GLcontext *ctx, GLenum format);
+
+extern GLboolean
+_mesa_dest_buffer_exists(GLcontext *ctx, GLenum format);
+
+
#endif /* FRAMEBUFFER_H */