Perhaps the easiest implementation, nouveau can directly map buffers
even if tiled, and uses separate surfaces for its texture
renderbuffers so we don't have to worry about that offset.
---
src/mesa/drivers/dri/nouveau/nouveau_fbo.c | 46 ++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
b/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
index b36b578..d56e954 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
@@ -133,6 +133,50 @@ nouveau_renderbuffer_new(struct gl_context *ctx, GLuint
name)
return rb;
}
+static void
+nouveau_renderbuffer_map(struct gl_context *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint x, GLuint y, GLuint w, GLuint h,
+ GLbitfield mode,
+ GLubyte **out_map,
+ GLint *out_stride)
+{
+ struct nouveau_surface *s = &to_nouveau_renderbuffer(rb)->surface;
+ GLubyte *map;
+ int stride;
+ int flags = 0;
+
+ if (mode & GL_MAP_READ_BIT)
+ flags |= NOUVEAU_BO_RD;
+ if (mode & GL_MAP_WRITE_BIT)
+ flags |= NOUVEAU_BO_WR;
+
+ nouveau_bo_map(s->bo, flags);
+
+ map = s->bo->map;
+ stride = s->pitch;
+
+ if (rb->Name == 0) {
+ map += stride * (rb->Height - 1);
+ stride = -stride;
+ }
+
+ map += x * s->cpp;
+ map += (int)y * stride;
+
+ *out_map = map;
+ *out_stride = stride;
+}
+
+static void
+nouveau_renderbuffer_unmap(struct gl_context *ctx,
+ struct gl_renderbuffer *rb)
+{
+ struct nouveau_surface *s = &to_nouveau_renderbuffer(rb)->surface;
+
+ nouveau_bo_unmap(s->bo);
+}
+
static GLboolean
nouveau_renderbuffer_dri_storage(struct gl_context *ctx, struct
gl_renderbuffer *rb,
GLenum internalFormat,
@@ -268,6 +312,8 @@ nouveau_fbo_functions_init(struct dd_function_table
*functions)
#if FEATURE_EXT_framebuffer_object
functions->NewFramebuffer = nouveau_framebuffer_new;
functions->NewRenderbuffer = nouveau_renderbuffer_new;
+ functions->MapRenderbuffer = nouveau_renderbuffer_map;
+ functions->UnmapRenderbuffer = nouveau_renderbuffer_unmap;
functions->BindFramebuffer = nouveau_bind_framebuffer;
functions->FramebufferRenderbuffer = nouveau_framebuffer_renderbuffer;
functions->RenderTexture = nouveau_render_texture;
--
1.7.7
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