i965/gs: Implement support for geometry shader surfaces.

This patch implements pull constant upload, binding table upload, and
surface setup for geometry shaders, by re-using vertex shader code
that was generalized in previous patches.

Based on work by Eric Anholt <eric@anholt.net>.

v2: Update ditry bits for brw_gs_ubo_surfaces to account for commit
77d8fbc (mesa: add & use a new driver flag for UBO updates instead of
_NEW_BUFFER_OBJECT).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/Makefile.sources

@@ -63,6 +63,7 @@ i965_FILES = \
 	brw_gs.c \
 	brw_gs_emit.c \
 	brw_gs_state.c \
+	brw_gs_surface_state.c \
 	brw_interpolation_map.c \
 	brw_lower_texture_gradients.cpp \
 	brw_misc_state.c \

src/mesa/drivers/dri/i965/brw_context.h

@@ -148,6 +148,7 @@ enum brw_state_id {
    BRW_STATE_BATCH,
    BRW_STATE_INDEX_BUFFER,
    BRW_STATE_VS_CONSTBUF,
+   BRW_STATE_GS_CONSTBUF,
    BRW_STATE_PROGRAM_CACHE,
    BRW_STATE_STATE_BASE_ADDRESS,
    BRW_STATE_VUE_MAP_VS,
@@ -185,6 +186,7 @@ enum brw_state_id {
 /** \see brw.state.depth_region */
 #define BRW_NEW_INDEX_BUFFER           (1 << BRW_STATE_INDEX_BUFFER)
 #define BRW_NEW_VS_CONSTBUF            (1 << BRW_STATE_VS_CONSTBUF)
+#define BRW_NEW_GS_CONSTBUF            (1 << BRW_STATE_GS_CONSTBUF)
 #define BRW_NEW_PROGRAM_CACHE		(1 << BRW_STATE_PROGRAM_CACHE)
 #define BRW_NEW_STATE_BASE_ADDRESS	(1 << BRW_STATE_STATE_BASE_ADDRESS)
 #define BRW_NEW_VUE_MAP_VS		(1 << BRW_STATE_VUE_MAP_VS)

src/mesa/drivers/dri/i965/brw_gs_surface_state.c

@@ -0,0 +1,122 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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 "main/mtypes.h"
+#include "program/prog_parameter.h"
+
+#include "brw_context.h"
+#include "brw_state.h"
+
+
+/* Creates a new GS constant buffer reflecting the current GS program's
+ * constants, if needed by the GS program.
+ *
+ * Otherwise, constants go through the CURBEs using the brw_constant_buffer
+ * state atom.
+ */
+static void
+brw_upload_gs_pull_constants(struct brw_context *brw)
+{
+   struct brw_stage_state *stage_state = &brw->gs.base;
+
+   /* BRW_NEW_GEOMETRY_PROGRAM */
+   struct brw_geometry_program *gp =
+      (struct brw_geometry_program *) brw->geometry_program;
+
+   if (!gp)
+      return;
+
+   /* CACHE_NEW_GS_PROG */
+   const struct brw_vec4_prog_data *prog_data = &brw->gs.prog_data->base;
+
+   /* _NEW_PROGRAM_CONSTANTS */
+   brw_upload_vec4_pull_constants(brw, BRW_NEW_GS_CONSTBUF, &gp->program.Base,
+                                  stage_state, prog_data);
+}
+
+const struct brw_tracked_state brw_gs_pull_constants = {
+   .dirty = {
+      .mesa = (_NEW_PROGRAM_CONSTANTS),
+      .brw = (BRW_NEW_BATCH | BRW_NEW_GEOMETRY_PROGRAM),
+      .cache = CACHE_NEW_GS_PROG,
+   },
+   .emit = brw_upload_gs_pull_constants,
+};
+
+static void
+brw_upload_gs_ubo_surfaces(struct brw_context *brw)
+{
+   struct gl_context *ctx = &brw->ctx;
+   struct brw_stage_state *stage_state = &brw->gs.base;
+
+   /* _NEW_PROGRAM */
+   struct gl_shader_program *prog = ctx->Shader.CurrentGeometryProgram;
+
+   if (!prog)
+      return;
+
+   brw_upload_ubo_surfaces(brw, prog->_LinkedShaders[MESA_SHADER_GEOMETRY],
+			   &stage_state->surf_offset[SURF_INDEX_VEC4_UBO(0)]);
+}
+
+const struct brw_tracked_state brw_gs_ubo_surfaces = {
+   .dirty = {
+      .mesa = _NEW_PROGRAM,
+      .brw = BRW_NEW_BATCH | BRW_NEW_UNIFORM_BUFFER,
+      .cache = 0,
+   },
+   .emit = brw_upload_gs_ubo_surfaces,
+};
+
+
+/**
+ * Constructs the binding table for the WM surface state, which maps unit
+ * numbers to surface state objects.
+ */
+static void
+brw_gs_upload_binding_table(struct brw_context *brw)
+{
+   struct brw_stage_state *stage_state = &brw->gs.base;
+
+   /* If there's no GS, skip changing anything. */
+   if (!brw->gs.prog_data)
+      return;
+
+   /* CACHE_NEW_GS_PROG */
+   const struct brw_vec4_prog_data *prog_data = &brw->gs.prog_data->base;
+
+   /* BRW_NEW_SURFACES and BRW_NEW_GS_CONSTBUF */
+   brw_vec4_upload_binding_table(brw, BRW_NEW_GS_BINDING_TABLE, stage_state,
+                                 prog_data);
+}
+
+const struct brw_tracked_state brw_gs_binding_table = {
+   .dirty = {
+      .mesa = 0,
+      .brw = (BRW_NEW_BATCH |
+	      BRW_NEW_GS_CONSTBUF |
+	      BRW_NEW_SURFACES),
+      .cache = CACHE_NEW_GS_PROG
+   },
+   .emit = brw_gs_upload_binding_table,
+};

src/mesa/drivers/dri/i965/brw_state.h

@@ -47,6 +47,7 @@ extern const struct brw_tracked_state brw_cc_unit;
 extern const struct brw_tracked_state brw_clip_prog;
 extern const struct brw_tracked_state brw_clip_unit;
 extern const struct brw_tracked_state brw_vs_pull_constants;
+extern const struct brw_tracked_state brw_gs_pull_constants;
 extern const struct brw_tracked_state brw_wm_pull_constants;
 extern const struct brw_tracked_state brw_constant_buffer;
 extern const struct brw_tracked_state brw_curbe_offsets;
@@ -69,11 +70,13 @@ extern const struct brw_tracked_state brw_urb_fence;
 extern const struct brw_tracked_state brw_vs_prog;
 extern const struct brw_tracked_state brw_vs_samplers;
 extern const struct brw_tracked_state brw_vs_ubo_surfaces;
+extern const struct brw_tracked_state brw_gs_ubo_surfaces;
 extern const struct brw_tracked_state brw_vs_unit;
 extern const struct brw_tracked_state brw_wm_prog;
 extern const struct brw_tracked_state brw_renderbuffer_surfaces;
 extern const struct brw_tracked_state brw_texture_surfaces;
 extern const struct brw_tracked_state brw_wm_binding_table;
+extern const struct brw_tracked_state brw_gs_binding_table;
 extern const struct brw_tracked_state brw_vs_binding_table;
 extern const struct brw_tracked_state brw_wm_ubo_surfaces;
 extern const struct brw_tracked_state brw_wm_unit;

src/mesa/drivers/dri/i965/brw_state_upload.c

@@ -202,11 +202,14 @@ static const struct brw_tracked_state *gen7_atoms[] =
     */
    &brw_vs_pull_constants,
    &brw_vs_ubo_surfaces,
+   &brw_gs_pull_constants,
+   &brw_gs_ubo_surfaces,
    &brw_wm_pull_constants,
    &brw_wm_ubo_surfaces,
    &gen6_renderbuffer_surfaces,
    &brw_texture_surfaces,
    &brw_vs_binding_table,
+   &brw_gs_binding_table,
    &brw_wm_binding_table,
 
    &brw_fs_samplers,