Added the texture usage parameter.

include/GLES2/gl2ext.h

@@ -222,6 +222,12 @@ typedef void* GLeglImageOES;
 #define GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE                0x93A0
 #endif
 
+/* GL_ANGLE_texture_usage */
+#ifndef GL_ANGLE_texture_usage
+#define GL_TEXTURE_USAGE_ANGLE                                  0x93A2
+#define GL_FRAMEBUFFER_ATTACHMENT_ANGLE                         0x93A3
+#endif
+
 /*------------------------------------------------------------------------*
  * APPLE extension tokens
  *------------------------------------------------------------------------*/
@@ -860,6 +866,11 @@ GL_APICALL void GL_APIENTRY glGetTranslatedShaderSourceANGLE (GLuint shader, GLs
 typedef void (GL_APIENTRYP PFNGLGETTRANSLATEDSHADERSOURCEANGLEPROC) (GLuint shader, GLsizei bufsize, GLsizei* length, GLchar* source);
 #endif
 
+/* GL_ANGLE_texture_usage */
+#ifndef GL_ANGLE_texture_usage
+#define GL_ANGLE_texture_usage 1
+#endif
+
 /*------------------------------------------------------------------------*
  * APPLE extension functions
  *------------------------------------------------------------------------*/

src/libGLESv2/Texture.cpp

@@ -1230,6 +1230,7 @@ Texture::Texture(GLuint id) : RefCountObject(id)
     mWrapS = GL_REPEAT;
     mWrapT = GL_REPEAT;
     mDirtyParameters = true;
+    mUsage = GL_NONE;
     
     mDirtyImages = true;
 
@@ -1332,6 +1333,20 @@ bool Texture::setWrapT(GLenum wrap)
     }
 }
 
+// Returns true on successful usage state update (valid enum parameter)
+bool Texture::setUsage(GLenum usage)
+{
+    switch (usage)
+    {
+      case GL_NONE:
+      case GL_FRAMEBUFFER_ATTACHMENT_ANGLE:
+        mUsage = usage;
+        return true;
+      default:
+        return false;
+    }
+}
+
 GLenum Texture::getMinFilter() const
 {
     return mMinFilter;
@@ -1352,6 +1367,11 @@ GLenum Texture::getWrapT() const
     return mWrapT;
 }
 
+GLenum Texture::getUsage() const
+{
+    return mUsage;
+}
+
 void Texture::setImage(GLint unpackAlignment, const void *pixels, Image *image)
 {
     if (pixels != NULL)

src/libGLESv2/Texture.h

@@ -170,11 +170,13 @@ class Texture : public RefCountObject
     bool setMagFilter(GLenum filter);
     bool setWrapS(GLenum wrap);
     bool setWrapT(GLenum wrap);
+    bool setUsage(GLenum usage);
 
     GLenum getMinFilter() const;
     GLenum getMagFilter() const;
     GLenum getWrapS() const;
     GLenum getWrapT() const;
+    GLenum getUsage() const;
 
     virtual GLsizei getWidth() const = 0;
     virtual GLsizei getHeight() const = 0;
@@ -227,6 +229,7 @@ class Texture : public RefCountObject
     GLenum mWrapS;
     GLenum mWrapT;
     bool mDirtyParameters;
+    GLenum mUsage;
 
     bool mDirtyImages;
 

src/libGLESv2/libGLESv2.cpp

@@ -3361,6 +3361,9 @@ void __stdcall glGetTexParameterfv(GLenum target, GLenum pname, GLfloat* params)
               case GL_TEXTURE_IMMUTABLE_FORMAT_EXT:
                 *params = (GLfloat)(texture->isImmutable() ? GL_TRUE : GL_FALSE);
                 break;
+              case GL_TEXTURE_USAGE_ANGLE:
+                *params = (GLfloat)texture->getUsage();
+                break;
               default:
                 return error(GL_INVALID_ENUM);
             }
@@ -3413,6 +3416,9 @@ void __stdcall glGetTexParameteriv(GLenum target, GLenum pname, GLint* params)
               case GL_TEXTURE_IMMUTABLE_FORMAT_EXT:
                 *params = texture->isImmutable() ? GL_TRUE : GL_FALSE;
                 break;
+              case GL_TEXTURE_USAGE_ANGLE:
+                *params = texture->getUsage();
+                break;
               default:
                 return error(GL_INVALID_ENUM);
             }
@@ -4832,6 +4838,12 @@ void __stdcall glTexParameteri(GLenum target, GLenum pname, GLint param)
                     return error(GL_INVALID_ENUM);
                 }
                 break;
+              case GL_TEXTURE_USAGE_ANGLE:
+                if (!texture->setUsage((GLenum)param))
+                {
+                    return error(GL_INVALID_ENUM);
+                }
+                break;
               default:
                 return error(GL_INVALID_ENUM);
             }