From c195c960fc2ce7a5a211c26310ae98bfe39ab777 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Mon, 1 Oct 2012 17:51:43 +0300
Subject: Add OpenGL GL_ARB_sampler_objects extension binding.

---
 src/graphicsmanager.cpp | 35 ++++++++++++++++++++++-------------
 src/mgl.cpp             |  4 ++++
 src/mgl.h               | 11 +++++++++++
 3 files changed, 37 insertions(+), 13 deletions(-)

diff --git a/src/graphicsmanager.cpp b/src/graphicsmanager.cpp
index d10b5de9e..4b59c68f2 100644
--- a/src/graphicsmanager.cpp
+++ b/src/graphicsmanager.cpp
@@ -48,6 +48,16 @@
 
 #include "debug.h"
 
+#ifdef WIN32
+#define getFunction(name) wglGetProcAddress(name)
+#else
+#define getFunction(name) glXGetProcAddress(\
+    reinterpret_cast<const GLubyte*>(name))
+#endif
+
+#define assignFunction(func, name) m##func \
+    = reinterpret_cast<func##_t>(getFunction(name))
+
 GraphicsManager graphicsManager;
 
 GraphicsManager::GraphicsManager() :
@@ -221,6 +231,9 @@ Graphics *GraphicsManager::createGraphics()
 void GraphicsManager::updateExtensions()
 {
 #ifdef USE_OPENGL
+    if (checkGLVersion(3, 0))
+        assignFunction(glGetStringi, "glGetStringi");
+
     mExtensions.clear();
     logger->log1("opengl extensions: ");
     if (checkGLVersion(3, 0))
@@ -549,16 +562,6 @@ void GraphicsManager::deleteFBO(FBOInfo *fbo)
 #endif
 }
 
-#ifdef WIN32
-#define getFunction(name) wglGetProcAddress(name)
-#else
-#define getFunction(name) glXGetProcAddress(\
-    reinterpret_cast<const GLubyte*>(name))
-#endif
-
-#define assignFunction(func, name) m##func \
-    = reinterpret_cast<func##_t>(getFunction(name))
-
 void GraphicsManager::initOpenGLFunctions()
 {
 #ifdef USE_OPENGL
@@ -595,8 +598,14 @@ void GraphicsManager::initOpenGLFunctions()
         config.setValue("usefbo", false);
     }
 
-    if (checkGLVersion(3, 0))
-        assignFunction(glGetStringi, "glGetStringi");
+    // Texture sampler
+    if (checkGLVersion(1, 0) && supportExtension("GL_ARB_sampler_objects"))
+    {
+        assignFunction(glGenSamplers, "glGenSamplers");
+        assignFunction(glDeleteSamplers, "glDeleteSamplers");
+        assignFunction(glBindSampler, "glBindSampler");
+        assignFunction(glSamplerParameteri, "glSamplerParameteri");
+    }
 
 #ifdef WIN32
     assignFunction(wglGetExtensionsString, "wglGetExtensionsStringARB");
@@ -624,8 +633,8 @@ void GraphicsManager::initOpenGL()
 {
 #ifdef USE_OPENGL
     setGLVersion();
-    initOpenGLFunctions();
     updateExtensions();
+    initOpenGLFunctions();
     updatePlanformExtensions();
     updateLimits();
 #endif
diff --git a/src/mgl.cpp b/src/mgl.cpp
index 6ed921b54..58e832b33 100644
--- a/src/mgl.cpp
+++ b/src/mgl.cpp
@@ -34,6 +34,10 @@ defName(glFramebufferRenderbuffer);
 defName(glDeleteFramebuffers);
 defName(glDeleteRenderbuffers);
 defName(glGetStringi);
+defName(glGenSamplers);
+defName(glDeleteSamplers);
+defName(glBindSampler);
+defName(glSamplerParameteri);
 
 #ifdef WIN32
 defName(wglGetExtensionsString);
diff --git a/src/mgl.h b/src/mgl.h
index 3c611e9ac..8526dbc67 100644
--- a/src/mgl.h
+++ b/src/mgl.h
@@ -51,6 +51,13 @@ typedef void (APIENTRY *glDeleteFramebuffers_t) (GLsizei, const GLuint *);
 typedef void (APIENTRY *glDeleteRenderbuffers_t) (GLsizei, const GLuint *);
 typedef const GLubyte *(APIENTRY *glGetStringi_t) (GLenum, GLuint);
 
+typedef void (APIENTRY *glGenSamplers_t) (GLsizei count, GLuint *samplers);
+typedef void (APIENTRY *glDeleteSamplers_t)
+    (GLsizei count, const GLuint * samplers);
+typedef void (APIENTRY *glBindSampler_t) (GLuint unit, GLuint sampler);
+typedef void (APIENTRY *glSamplerParameteri_t)
+    (GLuint sampler, GLenum pname, GLint param);
+
 defNameE(glGenRenderbuffers);
 defNameE(glBindRenderbuffer);
 defNameE(glRenderbufferStorage);
@@ -61,6 +68,10 @@ defNameE(glFramebufferRenderbuffer);
 defNameE(glDeleteFramebuffers);
 defNameE(glDeleteRenderbuffers);
 defNameE(glGetStringi);
+defNameE(glGenSamplers);
+defNameE(glDeleteSamplers);
+defNameE(glBindSampler);
+defNameE(glSamplerParameteri);
 
 #ifdef WIN32
 typedef const char* (APIENTRY * wglGetExtensionsString_t) (HDC hdc);
-- 
cgit v1.2.3-70-g09d2