iris: Initial commit of a new 'iris' driver for Intel Gen8+ GPUs.

This commit introduces a new Gallium driver for Intel Gen8+ GPUs,
named 'iris_dri.so' after the hardware.

Developed by:
- Kenneth Graunke (overall driver)
- Dave Airlie (shaders, conditional render, overflow query, Gen8 port)
- Chris Wilson (fencing, pinned memory, ...)
- Jordan Justen (compute shaders)
- Jason Ekstrand (image load store)
- Caio Marcelo de Oliveira Filho (tessellation control passthrough)
- Rafael Antognolli (auxiliary buffer fixes)
- The rest of the i965 contributors and the Mesa community

src/gallium/drivers/iris/iris_context.h

@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2017 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
+ * on 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
+ * THE AUTHOR(S) AND/OR THEIR 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.
+ */
+#ifndef IRIS_CONTEXT_H
+#define IRIS_CONTEXT_H
+
+#include "pipe/p_context.h"
+#include "pipe/p_state.h"
+#include "util/u_debug.h"
+#include "intel/common/gen_debug.h"
+#include "iris_screen.h"
+
+struct iris_bo;
+
+#define IRIS_MAX_TEXTURE_SAMPLERS 32
+#define IRIS_MAX_VIEWPORTS 16
+
+enum iris_dirty {
+   IRIS_DIRTY_COLOR_CALC_STATE,
+   IRIS_DIRTY_POLYGON_STIPPLE,
+   IRIS_DIRTY_SCISSOR_RECT,
+   IRIS_DIRTY_WM_DEPTH_STENCIL,
+};
+
+#define IRIS_NEW_COLOR_CALC_STATE (1ull << IRIS_DIRTY_COLOR_CALC_STATE)
+#define IRIS_NEW_POLYGON_STIPPLE  (1ull << IRIS_DIRTY_POLYGON_STIPPLE)
+#define IRIS_NEW_SCISSOR_RECT     (1ull << IRIS_DIRTY_SCISSOR_RECT)
+#define IRIS_NEW_WM_DEPTH_STENCIL (1ull << IRIS_DIRTY_WM_DEPTH_STENCIL)
+
+struct iris_context {
+   struct pipe_context ctx;
+
+   struct pipe_debug_callback dbg;
+
+   struct {
+      uint64_t dirty;
+      struct pipe_blend_color blend_color;
+      struct pipe_poly_stipple poly_stipple;
+      struct pipe_scissor_state scissors[IRIS_MAX_VIEWPORTS];
+      struct pipe_stencil_ref stencil_ref;
+   } state;
+};
+
+#define perf_debug(dbg, ...) do {                      \
+   if (INTEL_DEBUG & DEBUG_PERF)                       \
+      dbg_printf(__VA_ARGS__);                         \
+   if (unlikely(dbg))                                  \
+      pipe_debug_message(dbg, PERF_INFO, __VA_ARGS__); \
+} while(0)
+
+double get_time(void);
+
+struct pipe_context *
+iris_create_context(struct pipe_screen *screen, void *priv, unsigned flags);
+
+void iris_init_program_functions(struct pipe_context *ctx);
+void iris_init_state_functions(struct pipe_context *ctx);
+
+#endif