From 98d8765769d809b060721bb071ca56887011a6b8 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sun, 10 Aug 2014 01:25:12 +0300
Subject: Add support for OpenGL extension GL_ARB_clear_texture.

---
 src/graphicsmanager.cpp | 13 +++++++++++++
 src/render/mgl.cpp      |  2 ++
 src/render/mgl.h        |  2 ++
 src/render/mgltypes.h   |  5 +++++
 4 files changed, 22 insertions(+)

diff --git a/src/graphicsmanager.cpp b/src/graphicsmanager.cpp
index ed5983715..9b53de3e7 100644
--- a/src/graphicsmanager.cpp
+++ b/src/graphicsmanager.cpp
@@ -1065,14 +1065,26 @@ void GraphicsManager::initOpenGLFunctions()
     }
     if (is43 || supportExtension("GL_ARB_copy_image"))
     {
+        logger->log1("found GL_ARB_copy_image");
         assignFunction(glCopyImageSubData);
     }
     else
     {
         logger->log1("GL_ARB_copy_image not found");
     }
+    if (is44 || supportExtension("GL_ARB_clear_texture"))
+    {
+        logger->log1("found GL_ARB_clear_texture");
+        assignFunction(glClearTexImage);
+        assignFunction(glClearTexSubImage);
+    }
+    else
+    {
+        logger->log1("GL_ARB_clear_texture not found");
+    }
     if (is20 || supportExtension("GL_ARB_shader_objects"))
     {
+        logger->log1("found GL_ARB_shader_objects");
         assignFunction(glCreateShader);
         assignFunction(glDeleteShader);
         assignFunction(glGetShaderiv);
@@ -1100,6 +1112,7 @@ void GraphicsManager::initOpenGLFunctions()
 
         if (is30 || supportExtension("GL_EXT_gpu_shader4"))
         {
+            logger->log1("found GL_EXT_gpu_shader4");
             assignFunction(glBindFragDataLocation);
         }
         else
diff --git a/src/render/mgl.cpp b/src/render/mgl.cpp
index c8de23997..27174a0c6 100644
--- a/src/render/mgl.cpp
+++ b/src/render/mgl.cpp
@@ -108,6 +108,8 @@ defName(glDeleteQueries);
 defName(glGetQueryObjectiv);
 defName(glGetQueryObjectui64v);
 defName(glTextureSubImage2D);
+defName(glClearTexImage);
+defName(glClearTexSubImage);
 
 #ifdef WIN32
 defName(wglGetExtensionsString);
diff --git a/src/render/mgl.h b/src/render/mgl.h
index 705c66caa..d2ad570d9 100644
--- a/src/render/mgl.h
+++ b/src/render/mgl.h
@@ -111,6 +111,8 @@ defNameE(glDeleteQueries);
 defNameE(glGetQueryObjectiv);
 defNameE(glGetQueryObjectui64v);
 defNameE(glTextureSubImage2D);
+defNameE(glClearTexImage);
+defNameE(glClearTexSubImage);
 
 #ifdef WIN32
 defNameE(wglGetExtensionsString);
diff --git a/src/render/mgltypes.h b/src/render/mgltypes.h
index 24f1e8ca8..48ffbc34d 100644
--- a/src/render/mgltypes.h
+++ b/src/render/mgltypes.h
@@ -175,6 +175,11 @@ typedef void (APIENTRY *glGetQueryObjectui64v_t) (GLuint id,
 typedef void (APIENTRY *glTextureSubImage2D_t) (GLuint texture, GLenum target,
     GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height,
     GLenum format, GLenum type, const void *pixels);
+typedef void (APIENTRY *glClearTexImage_t) (GLuint texture, GLint level,
+    GLenum format, GLenum type, const void * data);
+typedef void (APIENTRY *glClearTexSubImage_t) (GLuint texture, GLint level,
+    GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height,
+    GLsizei depth, GLenum format, GLenum type, const void * data);
 
 // callback
 typedef void (APIENTRY *GLDEBUGPROC_t) (GLenum source, GLenum type, GLuint id,
-- 
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