glapi: autogenerate all _mesa_* forward declarations in api_exec_decl.h

We could remove them from other header files now.

This purposefully omits "_exec" in _mesa_exec such as _mesa_exec_Begin
to make it pretty. Later commits will remove _exec from names, e.g. it
will become _mesa_Begin. The only other variants are really just
save_Begin (dlist) and _save_Begin (vbo).

The autogenerated file looks like this:

void GLAPIENTRY _mesa_NewList(GLuint list, GLenum mode);
void GLAPIENTRY _mesa_EndList(void);
void GLAPIENTRY _mesa_CallList(GLuint list);
void GLAPIENTRY _mesa_CallLists(GLsizei n, GLenum type, const GLvoid * lists);
void GLAPIENTRY _mesa_DeleteLists(GLuint list, GLsizei range);
GLuint GLAPIENTRY _mesa_GenLists(GLsizei range);
void GLAPIENTRY _mesa_ListBase(GLuint base);
void GLAPIENTRY _mesa_Begin(GLenum mode);
void GLAPIENTRY _mesa_Bitmap(GLsizei width, GLsizei height, GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove, const GLubyte * bitmap);
void GLAPIENTRY _mesa_Color3b(GLbyte red, GLbyte green, GLbyte blue);
void GLAPIENTRY _mesa_Color3bv(const GLbyte * v);
...

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14000>

src/mapi/glapi/gen/api_exec_decl_h.py

@@ -0,0 +1,79 @@
+# Copyright (C) 2012 Intel Corporation
+# Copyright (C) 2021 Advanced Micro Devices, Inc.
+#
+# 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.
+
+# This script generates the file api_exec_decl.h, which contains forward
+# declarations of all GL functions prefixed with _mesa_*.
+
+import argparse
+import collections
+import license
+import gl_XML
+import sys
+import apiexec
+import textwrap
+
+
+class PrintCode(gl_XML.gl_print_base):
+    def __init__(self):
+        super().__init__()
+
+        self.name = 'api_exec_decl_h.py'
+        self.license = license.bsd_license_template % (
+            'Copyright (C) 2012 Intel Corporation\n'
+            'Copyright (C) 2021 Advanced Micro Devices, Inc.',
+            'AUTHORS')
+
+    def printBody(self, api):
+        print(textwrap.dedent("""\
+            #ifndef API_EXEC_DECL_H
+            #define API_EXEC_DECL_H
+
+            #include "GL/gl.h"
+
+            #define GL_API GLAPI
+            #define GL_APIENTRY GLAPIENTRY
+            #include "GLES/gl.h"
+
+            #ifdef __cplusplus
+            extern "C" {
+            #endif
+            """))
+
+        for f in api.functionIterateAll():
+            if f.exec_flavor == 'skip':
+                continue
+
+            print('{0} GLAPIENTRY _mesa_{1}({2});'.format(
+              f.return_type, f.name, f.get_parameter_string()))
+            if f.has_no_error_variant:
+                print('{0} GLAPIENTRY _mesa_{1}_no_error({2});'.format(
+                  f.return_type, f.name, f.get_parameter_string()))
+        print('')
+        print('#ifdef __cplusplus')
+        print('}')
+        print('#endif')
+        print('')
+        print('#endif')
+
+
+if __name__ == '__main__':
+    apiexec.print_glapi_file(PrintCode())

src/mapi/glapi/gen/api_exec_init.py

@@ -46,89 +46,10 @@ header = """/**
  */
 
 
-#include "main/accum.h"
+#include "api_exec_decl.h"
+#include "glapi/glapi.h"
 #include "main/context.h"
-#include "main/arbprogram.h"
-#include "main/atifragshader.h"
-#include "main/attrib.h"
-#include "main/blend.h"
-#include "main/blit.h"
-#include "main/bufferobj.h"
-#include "main/arrayobj.h"
-#include "main/bbox.h"
-#include "main/buffers.h"
-#include "main/clear.h"
-#include "main/clip.h"
-#include "main/colortab.h"
-#include "main/compute.h"
-#include "main/condrender.h"
-#include "main/conservativeraster.h"
-#include "main/context.h"
-#include "main/convolve.h"
-#include "main/copyimage.h"
-#include "main/depth.h"
-#include "main/debug_output.h"
-#include "main/dlist.h"
-#include "main/draw.h"
-#include "main/drawpix.h"
-#include "main/drawtex.h"
-#include "main/rastpos.h"
-#include "main/enable.h"
-#include "main/errors.h"
-#include "main/es1_conversion.h"
-#include "main/eval.h"
-#include "main/externalobjects.h"
-#include "main/get.h"
-#include "main/glspirv.h"
-#include "main/feedback.h"
-#include "main/fog.h"
-#include "main/fbobject.h"
-#include "main/framebuffer.h"
-#include "main/genmipmap.h"
-#include "main/hint.h"
-#include "main/histogram.h"
-#include "main/light.h"
-#include "main/lines.h"
-#include "main/matrix.h"
-#include "main/multisample.h"
-#include "main/objectlabel.h"
-#include "main/objectpurge.h"
-#include "main/performance_monitor.h"
-#include "main/performance_query.h"
-#include "main/pipelineobj.h"
-#include "main/pixel.h"
-#include "main/pixelstore.h"
-#include "main/points.h"
-#include "main/polygon.h"
-#include "main/program_resource.h"
-#include "main/querymatrix.h"
-#include "main/queryobj.h"
-#include "main/readpix.h"
-#include "main/samplerobj.h"
-#include "main/scissor.h"
-#include "main/stencil.h"
-#include "main/texenv.h"
-#include "main/texgetimage.h"
-#include "main/teximage.h"
-#include "main/texgen.h"
-#include "main/texobj.h"
-#include "main/texparam.h"
-#include "main/texstate.h"
-#include "main/texstorage.h"
-#include "main/barrier.h"
-#include "main/texturebindless.h"
-#include "main/textureview.h"
-#include "main/transformfeedback.h"
-#include "main/mtypes.h"
-#include "main/varray.h"
-#include "main/viewport.h"
-#include "main/shaderapi.h"
-#include "main/shaderimage.h"
-#include "main/uniforms.h"
-#include "main/syncobj.h"
-#include "main/formatquery.h"
 #include "main/dispatch.h"
-#include "main/vdpau.h"
 
 
 /**

src/mapi/glapi/gen/meson.build

@@ -224,6 +224,15 @@ main_api_exec_c = custom_target(
   capture : true,
 )
 
+main_api_exec_decl_h = custom_target(
+  'api_exec_decl.h',
+  input : ['api_exec_decl_h.py', 'gl_and_es_API.xml'],
+  output : 'api_exec_decl.h',
+  command : [prog_python, '@INPUT0@', '-f', '@INPUT1@'],
+  depend_files : files('apiexec.py') + glapi_gen_depends,
+  capture : true,
+)
+
 main_api_save_init_h = custom_target(
   'api_save_init.h',
   input : ['api_save_init_h.py', 'gl_and_es_API.xml'],

src/mesa/meson.build

@@ -525,6 +525,7 @@ files_libmesa += [
   mesa_lex,
   program_parse_tab,
   main_api_exec_c,
+  main_api_exec_decl_h,
   main_api_save_h,
   main_api_save_init_h,
   main_enums_c,