gallium/drivers: Create Galahad from identity.

Galahad is a sanity-checking layer meant to replace the crufty and
scattered sanity checks inside drivers with a robust, non-silenceable,
useful set of warnings and errors that can be used to keep misbehaving
state trackers from going unnoticed.

1 files changed, 952 insertions, 0 deletions

diff --git a/src/gallium/drivers/galahad/glhd_context.c b/src/gallium/drivers/galahad/glhd_context.c
new file mode 100644
index 00000000000..ae4fc923e42
--- /dev/null
+++ b/src/gallium/drivers/galahad/glhd_context.c
@@ -0,0 +1,952 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * 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"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "pipe/p_context.h"
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+#include "glhd_context.h"
+#include "glhd_objects.h"
+
+
+static void
+galahad_destroy(struct pipe_context *_pipe)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->destroy(pipe);
+
+   FREE(glhd_pipe);
+}
+
+static void
+galahad_draw_arrays(struct pipe_context *_pipe,
+                     unsigned prim,
+                     unsigned start,
+                     unsigned count)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->draw_arrays(pipe,
+                     prim,
+                     start,
+                     count);
+}
+
+static void
+galahad_draw_elements(struct pipe_context *_pipe,
+                       struct pipe_resource *_indexResource,
+                       unsigned indexSize,
+                       int indexBias,
+                       unsigned prim,
+                       unsigned start,
+                       unsigned count)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_resource *glhd_resource = galahad_resource(_indexResource);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_resource *indexResource = glhd_resource->resource;
+
+   pipe->draw_elements(pipe,
+                       indexResource,
+                       indexSize,
+                       indexBias,
+                       prim,
+                       start,
+                       count);
+}
+
+static void
+galahad_draw_range_elements(struct pipe_context *_pipe,
+                             struct pipe_resource *_indexResource,
+                             unsigned indexSize,
+                             int indexBias,
+                             unsigned minIndex,
+                             unsigned maxIndex,
+                             unsigned mode,
+                             unsigned start,
+                             unsigned count)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_resource *glhd_resource = galahad_resource(_indexResource);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_resource *indexResource = glhd_resource->resource;
+
+   pipe->draw_range_elements(pipe,
+                             indexResource,
+                             indexSize,
+                             indexBias,
+                             minIndex,
+                             maxIndex,
+                             mode,
+                             start,
+                             count);
+}
+
+static struct pipe_query *
+galahad_create_query(struct pipe_context *_pipe,
+                      unsigned query_type)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_query(pipe,
+                             query_type);
+}
+
+static void
+galahad_destroy_query(struct pipe_context *_pipe,
+                       struct pipe_query *query)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->destroy_query(pipe,
+                       query);
+}
+
+static void
+galahad_begin_query(struct pipe_context *_pipe,
+                     struct pipe_query *query)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->begin_query(pipe,
+                     query);
+}
+
+static void
+galahad_end_query(struct pipe_context *_pipe,
+                   struct pipe_query *query)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->end_query(pipe,
+                   query);
+}
+
+static boolean
+galahad_get_query_result(struct pipe_context *_pipe,
+                          struct pipe_query *query,
+                          boolean wait,
+                          void *result)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->get_query_result(pipe,
+                                 query,
+                                 wait,
+                                 result);
+}
+
+static void *
+galahad_create_blend_state(struct pipe_context *_pipe,
+                            const struct pipe_blend_state *blend)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_blend_state(pipe,
+                                   blend);
+}
+
+static void
+galahad_bind_blend_state(struct pipe_context *_pipe,
+                          void *blend)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_blend_state(pipe,
+                              blend);
+}
+
+static void
+galahad_delete_blend_state(struct pipe_context *_pipe,
+                            void *blend)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_blend_state(pipe,
+                            blend);
+}
+
+static void *
+galahad_create_sampler_state(struct pipe_context *_pipe,
+                              const struct pipe_sampler_state *sampler)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_sampler_state(pipe,
+                                     sampler);
+}
+
+static void
+galahad_bind_fragment_sampler_states(struct pipe_context *_pipe,
+                                      unsigned num_samplers,
+                                      void **samplers)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_fragment_sampler_states(pipe,
+                                      num_samplers,
+                                      samplers);
+}
+
+static void
+galahad_bind_vertex_sampler_states(struct pipe_context *_pipe,
+                                    unsigned num_samplers,
+                                    void **samplers)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_vertex_sampler_states(pipe,
+                                    num_samplers,
+                                    samplers);
+}
+
+static void
+galahad_delete_sampler_state(struct pipe_context *_pipe,
+                              void *sampler)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_sampler_state(pipe,
+                              sampler);
+}
+
+static void *
+galahad_create_rasterizer_state(struct pipe_context *_pipe,
+                                 const struct pipe_rasterizer_state *rasterizer)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_rasterizer_state(pipe,
+                                        rasterizer);
+}
+
+static void
+galahad_bind_rasterizer_state(struct pipe_context *_pipe,
+                               void *rasterizer)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_rasterizer_state(pipe,
+                               rasterizer);
+}
+
+static void
+galahad_delete_rasterizer_state(struct pipe_context *_pipe,
+                                 void *rasterizer)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_rasterizer_state(pipe,
+                                 rasterizer);
+}
+
+static void *
+galahad_create_depth_stencil_alpha_state(struct pipe_context *_pipe,
+                                          const struct pipe_depth_stencil_alpha_state *depth_stencil_alpha)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_depth_stencil_alpha_state(pipe,
+                                                 depth_stencil_alpha);
+}
+
+static void
+galahad_bind_depth_stencil_alpha_state(struct pipe_context *_pipe,
+                                        void *depth_stencil_alpha)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_depth_stencil_alpha_state(pipe,
+                                        depth_stencil_alpha);
+}
+
+static void
+galahad_delete_depth_stencil_alpha_state(struct pipe_context *_pipe,
+                                          void *depth_stencil_alpha)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_depth_stencil_alpha_state(pipe,
+                                          depth_stencil_alpha);
+}
+
+static void *
+galahad_create_fs_state(struct pipe_context *_pipe,
+                         const struct pipe_shader_state *fs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_fs_state(pipe,
+                                fs);
+}
+
+static void
+galahad_bind_fs_state(struct pipe_context *_pipe,
+                       void *fs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_fs_state(pipe,
+                       fs);
+}
+
+static void
+galahad_delete_fs_state(struct pipe_context *_pipe,
+                         void *fs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_fs_state(pipe,
+                         fs);
+}
+
+static void *
+galahad_create_vs_state(struct pipe_context *_pipe,
+                         const struct pipe_shader_state *vs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_vs_state(pipe,
+                                vs);
+}
+
+static void
+galahad_bind_vs_state(struct pipe_context *_pipe,
+                       void *vs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_vs_state(pipe,
+                       vs);
+}
+
+static void
+galahad_delete_vs_state(struct pipe_context *_pipe,
+                         void *vs)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_vs_state(pipe,
+                         vs);
+}
+
+
+static void *
+galahad_create_vertex_elements_state(struct pipe_context *_pipe,
+                                      unsigned num_elements,
+                                      const struct pipe_vertex_element *vertex_elements)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   return pipe->create_vertex_elements_state(pipe,
+                                             num_elements,
+                                             vertex_elements);
+}
+
+static void
+galahad_bind_vertex_elements_state(struct pipe_context *_pipe,
+                                    void *velems)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->bind_vertex_elements_state(pipe,
+                                    velems);
+}
+
+static void
+galahad_delete_vertex_elements_state(struct pipe_context *_pipe,
+                                      void *velems)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->delete_vertex_elements_state(pipe,
+                                      velems);
+}
+
+static void
+galahad_set_blend_color(struct pipe_context *_pipe,
+                         const struct pipe_blend_color *blend_color)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_blend_color(pipe,
+                         blend_color);
+}
+
+static void
+galahad_set_stencil_ref(struct pipe_context *_pipe,
+                         const struct pipe_stencil_ref *stencil_ref)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_stencil_ref(pipe,
+                         stencil_ref);
+}
+
+static void
+galahad_set_clip_state(struct pipe_context *_pipe,
+                        const struct pipe_clip_state *clip)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_clip_state(pipe,
+                        clip);
+}
+
+static void
+galahad_set_sample_mask(struct pipe_context *_pipe,
+                         unsigned sample_mask)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_sample_mask(pipe,
+                         sample_mask);
+}
+
+static void
+galahad_set_constant_buffer(struct pipe_context *_pipe,
+                             uint shader,
+                             uint index,
+                             struct pipe_resource *_resource)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_resource *unwrapped_resource;
+   struct pipe_resource *resource = NULL;
+
+   /* XXX hmm? unwrap the input state */
+   if (_resource) {
+      unwrapped_resource = galahad_resource_unwrap(_resource);
+      resource = unwrapped_resource;
+   }
+
+   pipe->set_constant_buffer(pipe,
+                             shader,
+                             index,
+                             resource);
+}
+
+static void
+galahad_set_framebuffer_state(struct pipe_context *_pipe,
+                               const struct pipe_framebuffer_state *_state)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_framebuffer_state unwrapped_state;
+   struct pipe_framebuffer_state *state = NULL;
+   unsigned i;
+
+   /* unwrap the input state */
+   if (_state) {
+      memcpy(&unwrapped_state, _state, sizeof(unwrapped_state));
+      for(i = 0; i < _state->nr_cbufs; i++)
+         unwrapped_state.cbufs[i] = galahad_surface_unwrap(_state->cbufs[i]);
+      for (; i < PIPE_MAX_COLOR_BUFS; i++)
+         unwrapped_state.cbufs[i] = NULL;
+      unwrapped_state.zsbuf = galahad_surface_unwrap(_state->zsbuf);
+      state = &unwrapped_state;
+   }
+
+   pipe->set_framebuffer_state(pipe,
+                               state);
+}
+
+static void
+galahad_set_polygon_stipple(struct pipe_context *_pipe,
+                             const struct pipe_poly_stipple *poly_stipple)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_polygon_stipple(pipe,
+                             poly_stipple);
+}
+
+static void
+galahad_set_scissor_state(struct pipe_context *_pipe,
+                           const struct pipe_scissor_state *scissor)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_scissor_state(pipe,
+                           scissor);
+}
+
+static void
+galahad_set_viewport_state(struct pipe_context *_pipe,
+                            const struct pipe_viewport_state *viewport)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->set_viewport_state(pipe,
+                            viewport);
+}
+
+static void
+galahad_set_fragment_sampler_views(struct pipe_context *_pipe,
+                                    unsigned num,
+                                    struct pipe_sampler_view **_views)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_sampler_view *unwrapped_views[PIPE_MAX_SAMPLERS];
+   struct pipe_sampler_view **views = NULL;
+   unsigned i;
+
+   if (_views) {
+      for (i = 0; i < num; i++)
+         unwrapped_views[i] = galahad_sampler_view_unwrap(_views[i]);
+      for (; i < PIPE_MAX_SAMPLERS; i++)
+         unwrapped_views[i] = NULL;
+
+      views = unwrapped_views;
+   }
+
+   pipe->set_fragment_sampler_views(pipe, num, views);
+}
+
+static void
+galahad_set_vertex_sampler_views(struct pipe_context *_pipe,
+                                  unsigned num,
+                                  struct pipe_sampler_view **_views)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_sampler_view *unwrapped_views[PIPE_MAX_VERTEX_SAMPLERS];
+   struct pipe_sampler_view **views = NULL;
+   unsigned i;
+
+   if (_views) {
+      for (i = 0; i < num; i++)
+         unwrapped_views[i] = galahad_sampler_view_unwrap(_views[i]);
+      for (; i < PIPE_MAX_VERTEX_SAMPLERS; i++)
+         unwrapped_views[i] = NULL;
+
+      views = unwrapped_views;
+   }
+
+   pipe->set_vertex_sampler_views(pipe, num, views);
+}
+
+static void
+galahad_set_vertex_buffers(struct pipe_context *_pipe,
+                            unsigned num_buffers,
+                            const struct pipe_vertex_buffer *_buffers)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_vertex_buffer unwrapped_buffers[PIPE_MAX_SHADER_INPUTS];
+   struct pipe_vertex_buffer *buffers = NULL;
+   unsigned i;
+
+   if (num_buffers) {
+      memcpy(unwrapped_buffers, _buffers, num_buffers * sizeof(*_buffers));
+      for (i = 0; i < num_buffers; i++)
+         unwrapped_buffers[i].buffer = galahad_resource_unwrap(_buffers[i].buffer);
+      buffers = unwrapped_buffers;
+   }
+
+   pipe->set_vertex_buffers(pipe,
+                            num_buffers,
+                            buffers);
+}
+static void
+galahad_resource_copy_region(struct pipe_context *_pipe,
+                              struct pipe_resource *_dst,
+                              struct pipe_subresource subdst,
+                              unsigned dstx,
+                              unsigned dsty,
+                              unsigned dstz,
+                              struct pipe_resource *_src,
+                              struct pipe_subresource subsrc,
+                              unsigned srcx,
+                              unsigned srcy,
+                              unsigned srcz,
+                              unsigned width,
+                              unsigned height)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_resource *glhd_resource_dst = galahad_resource(_dst);
+   struct galahad_resource *glhd_resource_src = galahad_resource(_src);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_resource *dst = glhd_resource_dst->resource;
+   struct pipe_resource *src = glhd_resource_src->resource;
+
+   pipe->resource_copy_region(pipe,
+                              dst,
+                              subdst,
+                              dstx,
+                              dsty,
+                              dstz,
+                              src,
+                              subsrc,
+                              srcx,
+                              srcy,
+                              srcz,
+                              width,
+                              height);
+}
+
+static void
+galahad_clear(struct pipe_context *_pipe,
+               unsigned buffers,
+               const float *rgba,
+               double depth,
+               unsigned stencil)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->clear(pipe,
+               buffers,
+               rgba,
+               depth,
+               stencil);
+}
+
+static void
+galahad_clear_render_target(struct pipe_context *_pipe,
+                             struct pipe_surface *_dst,
+                             const float *rgba,
+                             unsigned dstx, unsigned dsty,
+                             unsigned width, unsigned height)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_surface *glhd_surface_dst = galahad_surface(_dst);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_surface *dst = glhd_surface_dst->surface;
+
+   pipe->clear_render_target(pipe,
+                             dst,
+                             rgba,
+                             dstx,
+                             dsty,
+                             width,
+                             height);
+}
+static void
+galahad_clear_depth_stencil(struct pipe_context *_pipe,
+                             struct pipe_surface *_dst,
+                             unsigned clear_flags,
+                             double depth,
+                             unsigned stencil,
+                             unsigned dstx, unsigned dsty,
+                             unsigned width, unsigned height)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_surface *glhd_surface_dst = galahad_surface(_dst);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_surface *dst = glhd_surface_dst->surface;
+
+   pipe->clear_depth_stencil(pipe,
+                             dst,
+                             clear_flags,
+                             depth,
+                             stencil,
+                             dstx,
+                             dsty,
+                             width,
+                             height);
+
+}
+
+static void
+galahad_flush(struct pipe_context *_pipe,
+               unsigned flags,
+               struct pipe_fence_handle **fence)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+
+   pipe->flush(pipe,
+               flags,
+               fence);
+}
+
+static unsigned int
+galahad_is_resource_referenced(struct pipe_context *_pipe,
+                                struct pipe_resource *_resource,
+                                unsigned face,
+                                unsigned level)
+{
+   struct galahad_context *glhd_pipe = galahad_context(_pipe);
+   struct galahad_resource *glhd_resource = galahad_resource(_resource);
+   struct pipe_context *pipe = glhd_pipe->pipe;
+   struct pipe_resource *resource = glhd_resource->resource;
+
+   return pipe->is_resource_referenced(pipe,
+                                       resource,
+                                       face,
+                                       level);
+}
+
+static struct pipe_sampler_view *
+galahad_context_create_sampler_view(struct pipe_context *_pipe,
+                                     struct pipe_resource *_resource,
+                                     const struct pipe_sampler_view *templ)
+{
+   struct galahad_context *glhd_context = galahad_context(_pipe);
+   struct galahad_resource *glhd_resource = galahad_resource(_resource);
+   struct pipe_context *pipe = glhd_context->pipe;
+   struct pipe_resource *resource = glhd_resource->resource;
+   struct pipe_sampler_view *result;
+
+   result = pipe->create_sampler_view(pipe,
+                                      resource,
+                                      templ);
+
+   if (result)
+      return galahad_sampler_view_create(glhd_context, glhd_resource, result);
+   return NULL;
+}
+
+static void
+galahad_context_sampler_view_destroy(struct pipe_context *_pipe,
+                                      struct pipe_sampler_view *_view)
+{
+   galahad_sampler_view_destroy(galahad_context(_pipe),
+                                 galahad_sampler_view(_view));
+}
+
+static struct pipe_transfer *
+galahad_context_get_transfer(struct pipe_context *_context,
+                              struct pipe_resource *_resource,
+                              struct pipe_subresource sr,
+                              unsigned usage,
+                              const struct pipe_box *box)
+{
+   struct galahad_context *glhd_context = galahad_context(_context);
+   struct galahad_resource *glhd_resource = galahad_resource(_resource);
+   struct pipe_context *context = glhd_context->pipe;
+   struct pipe_resource *resource = glhd_resource->resource;
+   struct pipe_transfer *result;
+
+   result = context->get_transfer(context,
+                                  resource,
+                                  sr,
+                                  usage,
+                                  box);
+
+   if (result)
+      return galahad_transfer_create(glhd_context, glhd_resource, result);
+   return NULL;
+}
+
+static void
+galahad_context_transfer_destroy(struct pipe_context *_pipe,
+                                  struct pipe_transfer *_transfer)
+{
+   galahad_transfer_destroy(galahad_context(_pipe),
+                             galahad_transfer(_transfer));
+}
+
+static void *
+galahad_context_transfer_map(struct pipe_context *_context,
+                              struct pipe_transfer *_transfer)
+{
+   struct galahad_context *glhd_context = galahad_context(_context);
+   struct galahad_transfer *glhd_transfer = galahad_transfer(_transfer);
+   struct pipe_context *context = glhd_context->pipe;
+   struct pipe_transfer *transfer = glhd_transfer->transfer;
+
+   return context->transfer_map(context,
+                                transfer);
+}
+
+
+
+static void
+galahad_context_transfer_flush_region(struct pipe_context *_context,
+                                       struct pipe_transfer *_transfer,
+                                       const struct pipe_box *box)
+{
+   struct galahad_context *glhd_context = galahad_context(_context);
+   struct galahad_transfer *glhd_transfer = galahad_transfer(_transfer);
+   struct pipe_context *context = glhd_context->pipe;
+   struct pipe_transfer *transfer = glhd_transfer->transfer;
+
+   context->transfer_flush_region(context,
+                                  transfer,
+                                  box);
+}
+
+
+static void
+galahad_context_transfer_unmap(struct pipe_context *_context,
+                                struct pipe_transfer *_transfer)
+{
+   struct galahad_context *glhd_context = galahad_context(_context);
+   struct galahad_transfer *glhd_transfer = galahad_transfer(_transfer);
+   struct pipe_context *context = glhd_context->pipe;
+   struct pipe_transfer *transfer = glhd_transfer->transfer;
+
+   context->transfer_unmap(context,
+                           transfer);
+}
+
+
+static void
+galahad_context_transfer_inline_write(struct pipe_context *_context,
+                                       struct pipe_resource *_resource,
+                                       struct pipe_subresource sr,
+                                       unsigned usage,
+                                       const struct pipe_box *box,
+                                       const void *data,
+                                       unsigned stride,
+                                       unsigned slice_stride)
+{
+   struct galahad_context *glhd_context = galahad_context(_context);
+   struct galahad_resource *glhd_resource = galahad_resource(_resource);
+   struct pipe_context *context = glhd_context->pipe;
+   struct pipe_resource *resource = glhd_resource->resource;
+
+   context->transfer_inline_write(context,
+                                  resource,
+                                  sr,
+                                  usage,
+                                  box,
+                                  data,
+                                  stride,
+                                  slice_stride);
+}
+
+
+struct pipe_context *
+galahad_context_create(struct pipe_screen *_screen, struct pipe_context *pipe)
+{
+   struct galahad_context *glhd_pipe;
+   (void)galahad_screen(_screen);
+
+   glhd_pipe = CALLOC_STRUCT(galahad_context);
+   if (!glhd_pipe) {
+      return NULL;
+   }
+
+   glhd_pipe->base.winsys = NULL;
+   glhd_pipe->base.screen = _screen;
+   glhd_pipe->base.priv = pipe->priv; /* expose wrapped data */
+   glhd_pipe->base.draw = NULL;
+
+   glhd_pipe->base.destroy = galahad_destroy;
+   glhd_pipe->base.draw_arrays = galahad_draw_arrays;
+   glhd_pipe->base.draw_elements = galahad_draw_elements;
+   glhd_pipe->base.draw_range_elements = galahad_draw_range_elements;
+   glhd_pipe->base.create_query = galahad_create_query;
+   glhd_pipe->base.destroy_query = galahad_destroy_query;
+   glhd_pipe->base.begin_query = galahad_begin_query;
+   glhd_pipe->base.end_query = galahad_end_query;
+   glhd_pipe->base.get_query_result = galahad_get_query_result;
+   glhd_pipe->base.create_blend_state = galahad_create_blend_state;
+   glhd_pipe->base.bind_blend_state = galahad_bind_blend_state;
+   glhd_pipe->base.delete_blend_state = galahad_delete_blend_state;
+   glhd_pipe->base.create_sampler_state = galahad_create_sampler_state;
+   glhd_pipe->base.bind_fragment_sampler_states = galahad_bind_fragment_sampler_states;
+   glhd_pipe->base.bind_vertex_sampler_states = galahad_bind_vertex_sampler_states;
+   glhd_pipe->base.delete_sampler_state = galahad_delete_sampler_state;
+   glhd_pipe->base.create_rasterizer_state = galahad_create_rasterizer_state;
+   glhd_pipe->base.bind_rasterizer_state = galahad_bind_rasterizer_state;
+   glhd_pipe->base.delete_rasterizer_state = galahad_delete_rasterizer_state;
+   glhd_pipe->base.create_depth_stencil_alpha_state = galahad_create_depth_stencil_alpha_state;
+   glhd_pipe->base.bind_depth_stencil_alpha_state = galahad_bind_depth_stencil_alpha_state;
+   glhd_pipe->base.delete_depth_stencil_alpha_state = galahad_delete_depth_stencil_alpha_state;
+   glhd_pipe->base.create_fs_state = galahad_create_fs_state;
+   glhd_pipe->base.bind_fs_state = galahad_bind_fs_state;
+   glhd_pipe->base.delete_fs_state = galahad_delete_fs_state;
+   glhd_pipe->base.create_vs_state = galahad_create_vs_state;
+   glhd_pipe->base.bind_vs_state = galahad_bind_vs_state;
+   glhd_pipe->base.delete_vs_state = galahad_delete_vs_state;
+   glhd_pipe->base.create_vertex_elements_state = galahad_create_vertex_elements_state;
+   glhd_pipe->base.bind_vertex_elements_state = galahad_bind_vertex_elements_state;
+   glhd_pipe->base.delete_vertex_elements_state = galahad_delete_vertex_elements_state;
+   glhd_pipe->base.set_blend_color = galahad_set_blend_color;
+   glhd_pipe->base.set_stencil_ref = galahad_set_stencil_ref;
+   glhd_pipe->base.set_clip_state = galahad_set_clip_state;
+   glhd_pipe->base.set_sample_mask = galahad_set_sample_mask;
+   glhd_pipe->base.set_constant_buffer = galahad_set_constant_buffer;
+   glhd_pipe->base.set_framebuffer_state = galahad_set_framebuffer_state;
+   glhd_pipe->base.set_polygon_stipple = galahad_set_polygon_stipple;
+   glhd_pipe->base.set_scissor_state = galahad_set_scissor_state;
+   glhd_pipe->base.set_viewport_state = galahad_set_viewport_state;
+   glhd_pipe->base.set_fragment_sampler_views = galahad_set_fragment_sampler_views;
+   glhd_pipe->base.set_vertex_sampler_views = galahad_set_vertex_sampler_views;
+   glhd_pipe->base.set_vertex_buffers = galahad_set_vertex_buffers;
+   glhd_pipe->base.resource_copy_region = galahad_resource_copy_region;
+   glhd_pipe->base.clear = galahad_clear;
+   glhd_pipe->base.clear_render_target = galahad_clear_render_target;
+   glhd_pipe->base.clear_depth_stencil = galahad_clear_depth_stencil;
+   glhd_pipe->base.flush = galahad_flush;
+   glhd_pipe->base.is_resource_referenced = galahad_is_resource_referenced;
+   glhd_pipe->base.create_sampler_view = galahad_context_create_sampler_view;
+   glhd_pipe->base.sampler_view_destroy = galahad_context_sampler_view_destroy;
+   glhd_pipe->base.get_transfer = galahad_context_get_transfer;
+   glhd_pipe->base.transfer_destroy = galahad_context_transfer_destroy;
+   glhd_pipe->base.transfer_map = galahad_context_transfer_map;
+   glhd_pipe->base.transfer_unmap = galahad_context_transfer_unmap;
+   glhd_pipe->base.transfer_flush_region = galahad_context_transfer_flush_region;
+   glhd_pipe->base.transfer_inline_write = galahad_context_transfer_inline_write;
+
+   glhd_pipe->pipe = pipe;
+
+   return &glhd_pipe->base;
+}