Add detection of limited texture NPOT support.

svn path=/trunk/KDE/kdebase/workspace/; revision=1198553

lib/kwinglplatform.cpp

@@ -364,6 +364,8 @@ void GLPlatform::detect()
                      m_extensions.contains("GL_ARB_vertex_shader") &&
                      m_glslVersion >= kVersionNumber(1, 0);
 
+    m_textureNPOT = m_extensions.contains("GL_ARB_texture_non_power_of_two");
+
     m_chipset = "Unknown";
 
 
@@ -493,7 +495,17 @@ void GLPlatform::detect()
         if (m_chipClass < R300)
             m_supportsGLSL = false;
 
-        m_limitedGLSL = m_supportsGLSL && m_chipClass < R600;
+        m_limitedGLSL = false;
+        m_limitedNPOT = false;
+
+        if (m_chipClass < R600) {
+            if (driver() == Driver_Catalyst)
+                m_textureNPOT = m_limitedNPOT = false; // Software fallback
+            else if (driver() == Driver_R300G)
+                m_limitedNPOT = m_textureNPOT;
+
+            m_limitedGLSL = m_supportsGLSL;
+        }
 
         if (driver() == Driver_R600G ||
             (driver() == Driver_R600C && m_renderer.contains("DRI2")))
@@ -509,6 +521,7 @@ void GLPlatform::detect()
         if (m_driver == Driver_NVidia)
             m_looseBinding = true;
 
+        m_limitedNPOT = m_textureNPOT && m_chipClass < NV40;
         m_limitedGLSL = m_supportsGLSL && m_chipClass < G80;
     } 
 
@@ -532,6 +545,12 @@ bool GLPlatform::supports(GLFeature feature) const
     case LimitedGLSL:
         return m_limitedGLSL;
 
+    case TextureNPOT:
+        return m_textureNPOT;
+
+    case LimitedNPOT:
+        return m_limitedNPOT;
+
     default:
         return false;
     }

lib/kwinglplatform.h

@@ -65,6 +65,23 @@ enum GLFeature {
      * - Max 4 texture indirections
      */
     LimitedGLSL,
+
+    /**
+     * Set when the driver supports GL_ARB_texture_non_power_of_two.
+     */
+    TextureNPOT,
+
+    /**
+     * If set, the driver supports GL_ARB_texture_non_power_of_two with the
+     * GL_ARB_texture_rectangle limitations.
+     *
+     * This means no support for mipmap filters, and that only the following
+     * wrap modes are supported: 
+     * - GL_CLAMP
+     * - GL_CLAMP_TO_EDGE
+     * - GL_CLAMP_TO_BORDER
+     */
+    LimitedNPOT
 };
 
 enum Driver {
@@ -234,6 +251,8 @@ private:
     bool m_directRendering:1;
     bool m_supportsGLSL:1;
     bool m_limitedGLSL:1;
+    bool m_textureNPOT:1;
+    bool m_limitedNPOT:1;
     static GLPlatform *s_platform;
 };