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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include <GL/osmesa.h>
     10 
     11 #include "gl/SkMesaGLContext.h"
     12 #include "gl/GrGLDefines.h"
     13 
     14 SkMesaGLContext::AutoContextRestore::AutoContextRestore() {
     15     fOldContext = (Context)OSMesaGetCurrentContext();
     16     if (NULL != (OSMesaContext)fOldContext) {
     17         OSMesaGetColorBuffer((OSMesaContext)fOldContext,
     18                               &fOldWidth, &fOldHeight,
     19                               &fOldFormat, &fOldImage);
     20     }
     21 }
     22 
     23 SkMesaGLContext::AutoContextRestore::~AutoContextRestore() {
     24     if (NULL != (OSMesaContext)fOldContext) {
     25         OSMesaMakeCurrent((OSMesaContext)fOldContext, fOldImage,
     26                           fOldFormat, fOldWidth, fOldHeight);
     27     }
     28 }
     29 
     30 ///////////////////////////////////////////////////////////////////////////////
     31 
     32 SkMesaGLContext::SkMesaGLContext()
     33     : fContext(static_cast<Context>(NULL))
     34     , fImage(NULL) {
     35     GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
     36 }
     37 
     38 SkMesaGLContext::~SkMesaGLContext() {
     39     this->destroyGLContext();
     40 }
     41 
     42 void SkMesaGLContext::destroyGLContext() {
     43     if (fImage) {
     44         sk_free(fImage);
     45     }
     46 
     47     if (fContext) {
     48         OSMesaDestroyContext((OSMesaContext)fContext);
     49     }
     50 }
     51 
     52 static const GrGLint gBOGUS_SIZE = 16;
     53 
     54 const GrGLInterface* SkMesaGLContext::createGLContext() {
     55     /* Create an RGBA-mode context */
     56 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
     57     /* specify Z, stencil, accum sizes */
     58     fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
     59 #else
     60     fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
     61 #endif
     62     if (!fContext) {
     63         SkDebugf("OSMesaCreateContext failed!\n");
     64         this->destroyGLContext();
     65         return NULL;
     66     }
     67     // Allocate the image buffer
     68     fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
     69                                            4 * sizeof(GrGLubyte));
     70     if (!fImage) {
     71         SkDebugf("Alloc image buffer failed!\n");
     72         this->destroyGLContext();
     73         return NULL;
     74     }
     75 
     76     // Bind the buffer to the context and make it current
     77     if (!OSMesaMakeCurrent((OSMesaContext)fContext,
     78                            fImage,
     79                            GR_GL_UNSIGNED_BYTE,
     80                            gBOGUS_SIZE,
     81                            gBOGUS_SIZE)) {
     82         SkDebugf("OSMesaMakeCurrent failed!\n");
     83         this->destroyGLContext();
     84         return NULL;
     85     }
     86 
     87     const GrGLInterface* interface = GrGLCreateMesaInterface();
     88     if (!interface) {
     89         SkDebugf("Could not create GL interface!\n");
     90         this->destroyGLContext();
     91         return NULL;
     92     }
     93     return interface;
     94 
     95 }
     96 
     97 void SkMesaGLContext::makeCurrent() const {
     98     if (fContext) {
     99         if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
    100                                GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
    101             SkDebugf("Could not make MESA context current.");
    102         }
    103     }
    104 }
    105