glsl: Move functions into standalone_scaffolding.cpp for later reuse.

This patch moves the following functions from main.cpp (the main cpp
file for the standalone executable that is used to create the built-in
functions) to standalone_scaffolding.cpp, so that they can be re-used
in other standalone executables:

- initialize_context()*
- _mesa_new_shader()
- _mesa_reference_shader()

*initialize_context contained some code that was specific to main.cpp,
so it was split into two functions: initialize_context() (which
remains in main.cpp), and initialize_context_from_defaults() (which is
in standalone_scaffolding.cpp).

4 files changed, 150 insertions, 58 deletions

diff --git a/src/glsl/Makefile b/src/glsl/Makefile
index d1422c2a4d6..edfb35eb0b8 100644
--- a/src/glsl/Makefile
+++ b/src/glsl/Makefile
@@ -95,7 +95,8 @@ GLSL2_C_SOURCES = \
 	../mesa/program/hash_table.c \
 	../mesa/program/symbol_table.c
 GLSL2_CXX_SOURCES = \
-	main.cpp
+	main.cpp \
+	standalone_scaffolding.cpp
 
 GLSL2_OBJECTS = \
 	$(GLSL2_C_SOURCES:.c=.o) \
diff --git a/src/glsl/main.cpp b/src/glsl/main.cpp
index 7952bb1a3e3..9f85096e1a1 100644
--- a/src/glsl/main.cpp
+++ b/src/glsl/main.cpp
@@ -29,80 +29,26 @@
 #include "ir_print_visitor.h"
 #include "program.h"
 #include "loop_analysis.h"
-
-extern "C" struct gl_shader *
-_mesa_new_shader(struct gl_context *ctx, GLuint name, GLenum type);
-
-extern "C" void
-_mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
-                       struct gl_shader *sh);
-
-/* Copied from shader_api.c for the stand-alone compiler.
- */
-void
-_mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
-                       struct gl_shader *sh)
-{
-   *ptr = sh;
-}
-
-struct gl_shader *
-_mesa_new_shader(struct gl_context *ctx, GLuint name, GLenum type)
-{
-   struct gl_shader *shader;
-
-   (void) ctx;
-
-   assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER);
-   shader = rzalloc(NULL, struct gl_shader);
-   if (shader) {
-      shader->Type = type;
-      shader->Name = name;
-      shader->RefCount = 1;
-   }
-   return shader;
-}
+#include "standalone_scaffolding.h"
 
 static void
 initialize_context(struct gl_context *ctx, gl_api api)
 {
-   memset(ctx, 0, sizeof(*ctx));
-
-   ctx->API = api;
-
-   ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
-   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
-   ctx->Extensions.ARB_draw_instanced = GL_TRUE;
-   ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
-   ctx->Extensions.EXT_texture_array = GL_TRUE;
-   ctx->Extensions.NV_texture_rectangle = GL_TRUE;
-   ctx->Extensions.EXT_texture3D = GL_TRUE;
+   initialize_context_to_defaults(ctx, api);
 
    /* GLSL 1.30 isn't fully supported, but we need to advertise 1.30 so that
     * the built-in functions for 1.30 can be built.
     */
    ctx->Const.GLSLVersion = 130;
 
-   /* 1.10 minimums. */
-   ctx->Const.MaxLights = 8;
    ctx->Const.MaxClipPlanes = 8;
-   ctx->Const.MaxTextureUnits = 2;
+   ctx->Const.MaxDrawBuffers = 2;
 
    /* More than the 1.10 minimum to appease parser tests taken from
     * apps that (hopefully) already checked the number of coords.
     */
    ctx->Const.MaxTextureCoordUnits = 4;
 
-   ctx->Const.VertexProgram.MaxAttribs = 16;
-   ctx->Const.VertexProgram.MaxUniformComponents = 512;
-   ctx->Const.MaxVarying = 8;
-   ctx->Const.MaxVertexTextureImageUnits = 0;
-   ctx->Const.MaxCombinedTextureImageUnits = 2;
-   ctx->Const.MaxTextureImageUnits = 2;
-   ctx->Const.FragmentProgram.MaxUniformComponents = 64;
-
-   ctx->Const.MaxDrawBuffers = 2;
-
    ctx->Driver.NewShader = _mesa_new_shader;
 }
 
diff --git a/src/glsl/standalone_scaffolding.cpp b/src/glsl/standalone_scaffolding.cpp
new file mode 100644
index 00000000000..696ea757e96
--- /dev/null
+++ b/src/glsl/standalone_scaffolding.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright © 2011 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.
+ */
+
+/* This file declares stripped-down versions of functions that
+ * normally exist outside of the glsl folder, so that they can be used
+ * when running the GLSL compiler standalone (for unit testing or
+ * compiling builtins).
+ */
+
+#include "standalone_scaffolding.h"
+
+#include <assert.h>
+#include <string.h>
+#include "ralloc.h"
+
+void
+_mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
+                       struct gl_shader *sh)
+{
+   *ptr = sh;
+}
+
+struct gl_shader *
+_mesa_new_shader(struct gl_context *ctx, GLuint name, GLenum type)
+{
+   struct gl_shader *shader;
+
+   (void) ctx;
+
+   assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER);
+   shader = rzalloc(NULL, struct gl_shader);
+   if (shader) {
+      shader->Type = type;
+      shader->Name = name;
+      shader->RefCount = 1;
+   }
+   return shader;
+}
+
+void initialize_context_to_defaults(struct gl_context *ctx, gl_api api)
+{
+   memset(ctx, 0, sizeof(*ctx));
+
+   ctx->API = api;
+
+   ctx->Extensions.ARB_ES2_compatibility = true;
+   ctx->Extensions.ARB_draw_buffers = true;
+   ctx->Extensions.ARB_draw_instanced = true;
+   ctx->Extensions.ARB_fragment_coord_conventions = true;
+   ctx->Extensions.EXT_texture_array = true;
+   ctx->Extensions.NV_texture_rectangle = true;
+   ctx->Extensions.EXT_texture3D = true;
+
+   ctx->Const.GLSLVersion = 120;
+
+   /* 1.20 minimums. */
+   ctx->Const.MaxLights = 8;
+   ctx->Const.MaxClipPlanes = 6;
+   ctx->Const.MaxTextureUnits = 2;
+   ctx->Const.MaxTextureCoordUnits = 2;
+   ctx->Const.VertexProgram.MaxAttribs = 16;
+
+   ctx->Const.VertexProgram.MaxUniformComponents = 512;
+   ctx->Const.MaxVarying = 8; /* == gl_MaxVaryingFloats / 4 */
+   ctx->Const.MaxVertexTextureImageUnits = 0;
+   ctx->Const.MaxCombinedTextureImageUnits = 2;
+   ctx->Const.MaxTextureImageUnits = 2;
+   ctx->Const.FragmentProgram.MaxUniformComponents = 64;
+
+   ctx->Const.MaxDrawBuffers = 1;
+}
diff --git a/src/glsl/standalone_scaffolding.h b/src/glsl/standalone_scaffolding.h
new file mode 100644
index 00000000000..87733200670
--- /dev/null
+++ b/src/glsl/standalone_scaffolding.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2011 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.
+ */
+
+/* This file declares stripped-down versions of functions that
+ * normally exist outside of the glsl folder, so that they can be used
+ * when running the GLSL compiler standalone (for unit testing or
+ * compiling builtins).
+ */
+
+#pragma once
+#ifndef STANDALONE_SCAFFOLDING_H
+#define STANDALONE_SCAFFOLDING_H
+
+#include "main/mtypes.h"
+
+extern "C" void
+_mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
+                       struct gl_shader *sh);
+
+extern "C" struct gl_shader *
+_mesa_new_shader(struct gl_context *ctx, GLuint name, GLenum type);
+
+/**
+ * Initialize the given gl_context structure to a reasonable set of
+ * defaults representing the minimum capabilities required by the
+ * OpenGL spec.
+ *
+ * This is used when compiling builtin functions and in testing, when
+ * we don't have a connection to an actual driver.
+ */
+void initialize_context_to_defaults(struct gl_context *ctx, gl_api api);
+
+
+#endif /* STANDALONE_SCAFFOLDING_H */