Home | History | Annotate | Download | only in mesa 
      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/mesa/SkMesaGLContext.h"
     12 #include "gl/GrGLDefines.h"
     13 
     14 static const GrGLint gBOGUS_SIZE = 16;
     15 
     16 SkMesaGLContext::SkMesaGLContext()
     17     : fContext(static_cast<Context>(0))
     18     , fImage(nullptr) {
     19     GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
     20 
     21     /* Create an RGBA-mode context */
     22 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
     23     /* specify Z, stencil, accum sizes */
     24     fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, nullptr);
     25 #else
     26     fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, nullptr);
     27 #endif
     28     if (!fContext) {
     29         SkDebugf("OSMesaCreateContext failed!\n");
     30         this->destroyGLContext();
     31         return;
     32     }
     33     // Allocate the image buffer
     34     fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
     35                                            4 * sizeof(GrGLubyte));
     36     if (!fImage) {
     37         SkDebugf("Alloc image buffer failed!\n");
     38         this->destroyGLContext();
     39         return;
     40     }
     41 
     42     // Bind the buffer to the context and make it current
     43     if (!OSMesaMakeCurrent((OSMesaContext)fContext,
     44                            fImage,
     45                            GR_GL_UNSIGNED_BYTE,
     46                            gBOGUS_SIZE,
     47                            gBOGUS_SIZE)) {
     48         SkDebugf("OSMesaMakeCurrent failed!\n");
     49         this->destroyGLContext();
     50         return;
     51     }
     52 
     53     SkAutoTUnref<const GrGLInterface> gl(GrGLCreateMesaInterface());
     54     if (nullptr == gl.get()) {
     55         SkDebugf("Could not create GL interface!\n");
     56         this->destroyGLContext();
     57         return;
     58     }
     59 
     60     if (!gl->validate()) {
     61         SkDebugf("Could not validate GL interface!\n");
     62         this->destroyGLContext();
     63         return;
     64     }
     65 
     66     this->init(gl.detach());
     67 }
     68 
     69 SkMesaGLContext::~SkMesaGLContext() {
     70     this->teardown();
     71     this->destroyGLContext();
     72 }
     73 
     74 void SkMesaGLContext::destroyGLContext() {
     75     if (fImage) {
     76         sk_free(fImage);
     77         fImage = nullptr;
     78     }
     79 
     80     if (fContext) {
     81         OSMesaDestroyContext((OSMesaContext)fContext);
     82         fContext = static_cast<Context>(0);
     83     }
     84 }
     85 
     86 
     87 
     88 void SkMesaGLContext::onPlatformMakeCurrent() const {
     89     if (fContext) {
     90         if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
     91                                GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
     92             SkDebugf("Could not make MESA context current.");
     93         }
     94     }
     95 }
     96 
     97 void SkMesaGLContext::onPlatformSwapBuffers() const { }
     98 
     99 GrGLFuncPtr SkMesaGLContext::onPlatformGetProcAddress(const char* procName) const {
    100     return OSMesaGetProcAddress(procName);
    101 }
    102