spirv_extensions: add GL_ARB_spirv_extensions boilerplate

v2:
  * Mention extension gap at gl_API.xml (Emil Velikov)
  * Bail with INVALID_ENUM if extension not available on getStringi (Emil Velikov)
  * Use EXTRA_EXT macro when defining the extension at
    get.c/get_hash_params.py (Emil Velikov)
  * Rename source files (spirvextensions.[ch] -> spirv_extensions.[ch]) (Ian)

v3:
  * Fix GL_PROGRAM_BINARY_FORMATS glGet query, broken by error on a
    previous rebase

v4:
   * Fix rebase conflicts on getstring.c after
     GL_SHADING_LANGUAGE_VERSION query was added

v5:
   * Remove src/mapi/glapi/gen/Makefile.am as it no longer exists in
     master

Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>
Signed-off-by: Arcady Goldmints-Orlov <agoldmints@igalia.com>

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/mapi/glapi/gen/ARB_spirv_extensions.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!DOCTYPE OpenGLAPI SYSTEM "gl_API.dtd">
+
+<OpenGLAPI>
+
+<category name="GL_ARB_spirv_extensions" number="194">
+
+    <enum name="SPIR_V_EXTENSIONS" value="0x9553"/>
+    <enum name="NUM_SPIR_V_EXTENSIONS" value="0x9554"/>
+
+</category>
+
+</OpenGLAPI>

src/mapi/glapi/gen/gl_API.xml

@@ -8424,6 +8424,10 @@
 
 <xi:include href="ARB_gl_spirv.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
 
+<!-- ARB extensions 191 - 193 -->
+
+<xi:include href="ARB_spirv_extensions.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
+
 <!-- Non-ARB extensions sorted by extension number. -->
 
 <category name="GL_EXT_blend_color" number="2">

src/mapi/glapi/gen/meson.build

@@ -82,6 +82,7 @@ api_xml_files = files(
   'ARB_shader_subroutine.xml',
   'ARB_shader_storage_buffer_object.xml',
   'ARB_sparse_buffer.xml',
+  'ARB_spirv_extensions.xml',
   'ARB_sync.xml',
   'ARB_tessellation_shader.xml',
   'ARB_texture_barrier.xml',

src/mesa/Makefile.sources

@@ -209,6 +209,8 @@ MAIN_FILES = \
 	main/shader_query.cpp \
 	main/shared.c \
 	main/shared.h \
+	main/spirv_extensions.c \
+	main/spirv_extensions.h \
 	main/state.c \
 	main/state.h \
 	main/stencil.c \

src/mesa/main/extensions_table.h

@@ -140,6 +140,7 @@ EXT(ARB_shading_language_420pack            , ARB_shading_language_420pack
 EXT(ARB_shading_language_packing            , ARB_shading_language_packing           , GLL, GLC,  x ,  x , 2011)
 EXT(ARB_shadow                              , ARB_shadow                             , GLL,  x ,  x ,  x , 2001)
 EXT(ARB_sparse_buffer                       , ARB_sparse_buffer                      , GLL, GLC,  x ,  x , 2014)
+EXT(ARB_spirv_extensions                    , ARB_spirv_extensions                   ,  x,  GLC,  x ,  x , 2016)
 EXT(ARB_stencil_texturing                   , ARB_stencil_texturing                  , GLL, GLC,  x ,  x , 2012)
 EXT(ARB_sync                                , ARB_sync                               , GLL, GLC,  x ,  x , 2003)
 EXT(ARB_tessellation_shader                 , ARB_tessellation_shader                , GLL, GLC,  x ,  x , 2009)

src/mesa/main/get.c

@@ -34,6 +34,7 @@
 #include "get.h"
 #include "macros.h"
 #include "mtypes.h"
+#include "spirv_extensions.h"
 #include "state.h"
 #include "texcompress.h"
 #include "texstate.h"
@@ -521,6 +522,7 @@ EXTRA_EXT(NV_conservative_raster_dilate);
 EXTRA_EXT(NV_conservative_raster_pre_snap_triangles);
 EXTRA_EXT(ARB_sample_locations);
 EXTRA_EXT(AMD_framebuffer_multisample_advanced);
+EXTRA_EXT(ARB_spirv_extensions);
 
 static const int
 extra_ARB_color_buffer_float_or_glcore[] = {
@@ -1235,6 +1237,10 @@ find_custom_value(struct gl_context *ctx, const struct value_desc *d, union valu
          v->value_int_n.ints[0] = GL_PROGRAM_BINARY_FORMAT_MESA;
       }
       break;
+   /* ARB_spirv_extensions */
+   case GL_NUM_SPIR_V_EXTENSIONS:
+      v->value_int = _mesa_get_spirv_extension_count(ctx);
+      break;
    /* GL_EXT_disjoint_timer_query */
    case GL_GPU_DISJOINT_EXT:
       {

src/mesa/main/get_hash_params.py

@@ -415,6 +415,9 @@ descriptor=[
 # GL_ARB_sampler_objects / GL 3.3 / GLES 3.0
   [ "SAMPLER_BINDING", "LOC_CUSTOM, TYPE_INT, GL_SAMPLER_BINDING, NO_EXTRA" ],
 
+# GL_ARB_spirv_extensions
+  [ "NUM_SPIR_V_EXTENSIONS", "LOC_CUSTOM, TYPE_INT, 0, extra_ARB_spirv_extensions" ],
+
 # GL_ARB_sync
   [ "MAX_SERVER_WAIT_TIMEOUT", "CONTEXT_INT64(Const.MaxServerWaitTimeout), extra_ARB_sync" ],
 

src/mesa/main/getstring.c

@@ -33,6 +33,7 @@
 #include "mtypes.h"
 #include "macros.h"
 #include "version.h"
+#include "spirv_extensions.h"
 
 /**
  * Return the string for a glGetString(GL_SHADING_LANGUAGE_VERSION) query.
@@ -206,6 +207,18 @@ _mesa_GetStringi(GLenum name, GLuint index)
          }
          return (const GLubyte *) version;
       }
+   case GL_SPIR_V_EXTENSIONS:
+      if (!ctx->Extensions.ARB_spirv_extensions) {
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetStringi");
+         return (const GLubyte *) 0;
+      }
+
+      if (index >= _mesa_get_spirv_extension_count(ctx)) {
+         _mesa_error(ctx, GL_INVALID_VALUE, "glGetStringi(index=%u)", index);
+         return (const GLubyte *) 0;
+      }
+      return _mesa_get_enabled_spirv_extension(ctx, index);
+
    default:
       _mesa_error(ctx, GL_INVALID_ENUM, "glGetStringi");
       return (const GLubyte *) 0;

src/mesa/main/mtypes.h

@@ -4220,6 +4220,7 @@ struct gl_extensions
    GLboolean ARB_shadow;
    GLboolean ARB_sparse_buffer;
    GLboolean ARB_stencil_texturing;
+   GLboolean ARB_spirv_extensions;
    GLboolean ARB_sync;
    GLboolean ARB_tessellation_shader;
    GLboolean ARB_texture_border_clamp;

src/mesa/main/spirv_extensions.c

@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+
+/**
+ * \file
+ * \brief SPIRV-V extension handling. See ARB_spirv_extensions
+ */
+
+#include "spirv_extensions.h"
+
+GLuint
+_mesa_get_spirv_extension_count(struct gl_context *ctx)
+{
+   return 0;
+}
+
+const GLubyte *
+_mesa_get_enabled_spirv_extension(struct gl_context *ctx,
+                                  GLuint index)
+{
+   return (const GLubyte *) 0;
+}

src/mesa/main/spirv_extensions.h

@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+
+/**
+ * \file
+ * \brief SPIRV-V extension handling. See ARB_spirv_extensions
+ */
+
+#ifndef _SPIRVEXTENSIONS_H_
+#define _SPIRVEXTENSIONS_H_
+
+#include "mtypes.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern GLuint
+_mesa_get_spirv_extension_count(struct gl_context *ctx);
+
+extern const GLubyte *
+_mesa_get_enabled_spirv_extension(struct gl_context *ctx,
+                                  GLuint index);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SPIRVEXTENSIONS_H */

src/mesa/meson.build

@@ -249,6 +249,8 @@ files_libmesa_common = files(
   'main/shader_query.cpp',
   'main/shared.c',
   'main/shared.h',
+  'main/spirv_extensions.c',
+  'main/spirv_extensions.h',
   'main/state.c',
   'main/state.h',
   'main/stencil.c',