From 78ff6b4ab677e156b016054ece6a4d08d5846cb7 Mon Sep 17 00:00:00 2001
From: "robertphillips@google.com"
 <robertphillips@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Wed, 28 Mar 2012 19:37:51 +0000
Subject: Moved mac, unix, win and mesa directories under src/gpu/gl

http://codereview.appspot.com/5937052/



git-svn-id: http://skia.googlecode.com/svn/trunk@3530 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 src/gpu/gl/mesa/SkMesaGLContext.cpp | 103 ++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/gpu/gl/mesa/SkMesaGLContext.cpp

(limited to 'src/gpu/gl/mesa/SkMesaGLContext.cpp')

diff --git a/src/gpu/gl/mesa/SkMesaGLContext.cpp b/src/gpu/gl/mesa/SkMesaGLContext.cpp
new file mode 100644
index 0000000000..c4f84cf8d2
--- /dev/null
+++ b/src/gpu/gl/mesa/SkMesaGLContext.cpp
@@ -0,0 +1,103 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <GL/osmesa.h>
+
+#include "gl/SkMesaGLContext.h"
+
+SkMesaGLContext::AutoContextRestore::AutoContextRestore() {
+    fOldContext = (Context)OSMesaGetCurrentContext();
+    if (NULL != (OSMesaContext)fOldContext) {
+        OSMesaGetColorBuffer((OSMesaContext)fOldContext,
+                              &fOldWidth, &fOldHeight,
+                              &fOldFormat, &fOldImage); 
+    }
+}
+
+SkMesaGLContext::AutoContextRestore::~AutoContextRestore() {
+    if (NULL != (OSMesaContext)fOldContext) {
+        OSMesaMakeCurrent((OSMesaContext)fOldContext, fOldImage, 
+                          fOldFormat, fOldWidth, fOldHeight);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkMesaGLContext::SkMesaGLContext()
+    : fContext(NULL)
+    , fImage(NULL) {
+    GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
+}
+
+SkMesaGLContext::~SkMesaGLContext() {
+    this->destroyGLContext();
+}
+
+void SkMesaGLContext::destroyGLContext() {
+    if (fImage) {
+        sk_free(fImage);
+    }
+    
+    if (fContext) {
+        OSMesaDestroyContext((OSMesaContext)fContext);
+    }
+}
+
+static const GrGLint gBOGUS_SIZE = 16;
+
+const GrGLInterface* SkMesaGLContext::createGLContext() {
+    /* Create an RGBA-mode context */
+#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
+    /* specify Z, stencil, accum sizes */
+    fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
+#else
+    fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
+#endif
+    if (!fContext) {
+        SkDebugf("OSMesaCreateContext failed!\n");
+        this->destroyGLContext();
+        return NULL;
+    }
+    // Allocate the image buffer
+    fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
+                                           4 * sizeof(GrGLubyte));
+    if (!fImage) {
+        SkDebugf("Alloc image buffer failed!\n");
+        this->destroyGLContext();
+        return NULL;
+    }
+    
+    // Bind the buffer to the context and make it current
+    if (!OSMesaMakeCurrent((OSMesaContext)fContext, 
+                           fImage, 
+                           GR_GL_UNSIGNED_BYTE, 
+                           gBOGUS_SIZE, 
+                           gBOGUS_SIZE)) {
+        SkDebugf("OSMesaMakeCurrent failed!\n");
+        this->destroyGLContext();
+        return NULL;
+    }
+    
+    const GrGLInterface* interface = GrGLCreateMesaInterface();
+    if (!interface) {
+        SkDebugf("Could not create GL interface!\n");
+        this->destroyGLContext();
+        return NULL;
+    }
+    return interface;
+    
+}
+
+void SkMesaGLContext::makeCurrent() const {
+    if (fContext) {
+        if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage, 
+                               GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
+            SkDebugf("Could not make MESA context current.");
+        }
+    }
+}
-- 
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