From c3da0c33a4ccaf321d422f5d24a00bdc1eff7e77 Mon Sep 17 00:00:00 2001
From: Pawel Kolodziejski <aquadran@users.sourceforge.net>
Date: Sat, 21 Feb 2015 13:43:30 +0100
Subject: [PATCH] GFX: make OS X work with OpenGL 2.1 shaders

---
 graphics/opengles2/box_shaders.cpp    | 12 ++++-----
 graphics/opengles2/compat_shaders.cpp | 38 ++++++++++++++++++++++-----
 graphics/opengles2/shader.cpp         |  4 +++
 3 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/graphics/opengles2/box_shaders.cpp b/graphics/opengles2/box_shaders.cpp
index 4cf32f71033..beb468b7541 100644
--- a/graphics/opengles2/box_shaders.cpp
+++ b/graphics/opengles2/box_shaders.cpp
@@ -28,7 +28,6 @@ namespace Graphics {
 namespace BuiltinShaders {
 
 const char *boxVertex =
-	"#version 100\n"
 	"attribute vec2 position;\n"
 	"attribute vec2 texcoord;\n"
 	"uniform vec2 offsetXY;\n"
@@ -47,11 +46,12 @@ const char *boxVertex =
 	"}\n";
 
 const char *boxFragment =
-	"#version 100\n"
-	"#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
-		"precision highp float;\n"
-	"#else\n"
-		"precision mediump float;\n"
+	"#ifdef GL_ES\n"
+		"#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
+			"precision highp float;\n"
+		"#else\n"
+			"precision mediump float;\n"
+		"#endif\n"
 	"#endif\n"
 	"varying vec2 Texcoord;\n"
 	"uniform sampler2D tex;\n"
diff --git a/graphics/opengles2/compat_shaders.cpp b/graphics/opengles2/compat_shaders.cpp
index 45fe9797b88..74eb7533185 100644
--- a/graphics/opengles2/compat_shaders.cpp
+++ b/graphics/opengles2/compat_shaders.cpp
@@ -28,15 +28,37 @@ namespace Graphics {
 namespace BuiltinShaders {
 
 const char *compatVertex =
+#if defined(USE_OPENGL_SHADERS)
+	"#if __VERSION__ < 130\n"
+		"float round(in float x) {\n"
+		"return sign(x) * floor(abs(x) + .5);\n"
+		"}\n"
+		"#define highp\n"
+		"#define in attribute\n"
+		"#define out varying\n"
+	"#endif\n"
+#else
 	"#ifdef GL_ES\n"
-	"mediump float round(in mediump float x) {\n"
-	"	return sign(x) * floor(abs(x) + .5);\n"
-	"}\n"
-	"#define in attribute\n"
-	"#define out varying\n"
-	"#endif\n";
+		"mediump float round(in mediump float x) {\n"
+			"return sign(x) * floor(abs(x) + .5);\n"
+		"}\n"
+		"#define in attribute\n"
+		"#define out varying\n"
+	"#endif\n"
+#endif
+;
 
 const char *compatFragment =
+#if defined(USE_OPENGL_SHADERS)
+	"#if __VERSION__ < 130\n"
+		"#define in varying\n"
+		"#define OUTPUT\n"
+		"#define outColor gl_FragColor\n"
+		"#define texture texture2D\n"
+	"#else\n"
+		"#define OUTPUT out vec4 outColor;\n"
+	"#endif\n"
+#else
 	"#ifdef GL_ES\n"
 		"#define in varying\n"
 		"#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
@@ -49,7 +71,9 @@ const char *compatFragment =
 		"#define texture texture2D\n"
 	"#else\n"
 		"#define OUTPUT out vec4 outColor;\n"
-	"#endif\n";
+	"#endif\n"
+#endif
+;
 
 }
 }
diff --git a/graphics/opengles2/shader.cpp b/graphics/opengles2/shader.cpp
index 4603239b816..f1989c01f40 100644
--- a/graphics/opengles2/shader.cpp
+++ b/graphics/opengles2/shader.cpp
@@ -74,7 +74,11 @@ static GLuint createCompatShader(const char *shaderSource, GLenum shaderType, co
 #ifdef USE_GLES2
 		"#version 100\n",
 #else
+	#ifdef MACOSX
+		"#version 120\n",
+	#else
 		"#version 130\n",
+	#endif
 #endif
 		compatSource,
 		shaderSource