| |
| /* |
| * 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 "SkEGLContext.h" |
| #include "SkTypes.h" |
| |
| #include "GL/osmesa.h" |
| #include "GL/glu.h" |
| |
| #define SK_GL_DECL_PROC(T, F) T F ## _func = NULL; |
| #define SK_GL_GET_PROC(T, F) F ## _func = (T)OSMesaGetProcAddress(#F); |
| #define SK_GL_GET_EXT_PROC(T, F) F ## _func = (T)OSMesaGetProcAddress(#F "EXT"); |
| |
| SkEGLContext::SkEGLContext() |
| : fFBO(0) |
| , context(NULL) |
| , image(NULL) { |
| } |
| |
| SkEGLContext::~SkEGLContext() { |
| if (this->image) |
| free(this->image); |
| |
| if (this->context) |
| OSMesaDestroyContext(this->context); |
| } |
| |
| #if SK_B32_SHIFT < SK_G32_SHIFT &&\ |
| SK_G32_SHIFT < SK_R32_SHIFT &&\ |
| SK_R32_SHIFT < SK_A32_SHIFT |
| #define SK_OSMESA_COLOR_ORDER OSMESA_BGRA |
| #elif SK_R32_SHIFT < SK_G32_SHIFT &&\ |
| SK_G32_SHIFT < SK_B32_SHIFT &&\ |
| SK_B32_SHIFT < SK_A32_SHIFT |
| #define SK_OSMESA_COLOR_ORDER OSMESA_RGBA |
| #elif SK_A32_SHIFT < SK_R32_SHIFT && \ |
| SK_R32_SHIFT < SK_G32_SHIFT && \ |
| SK_G32_SHIFT < SK_B32_SHIFT |
| #define SK_OSMESA_COLOR_ORDER OSMESA_ARGB |
| #else |
| //Color order (rgba) SK_R32_SHIFT SK_G32_SHIFT SK_B32_SHIFT SK_A32_SHIFT |
| #define SK_OSMESA_COLOR_ORDER OSMESA_RGBA |
| #endif |
| |
| bool SkEGLContext::init(const int width, const int height) { |
| /* Create an RGBA-mode context */ |
| #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305 |
| /* specify Z, stencil, accum sizes */ |
| OSMesaContext ctx = OSMesaCreateContextExt(SK_OSMESA_COLOR_ORDER, 16, 0, 0, NULL); |
| #else |
| OSMesaContext ctx = OSMesaCreateContext(SK_OSMESA_COLOR_ORDER, NULL); |
| #endif |
| if (!ctx) { |
| SkDebugf("OSMesaCreateContext failed!\n"); |
| return false; |
| } |
| this->context = ctx; |
| |
| // Allocate the image buffer |
| GLfloat *buffer = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat)); |
| if (!buffer) { |
| SkDebugf("Alloc image buffer failed!\n"); |
| return false; |
| } |
| this->image = buffer; |
| |
| // Bind the buffer to the context and make it current |
| if (!OSMesaMakeCurrent(ctx, buffer, GL_FLOAT, width, height)) { |
| SkDebugf("OSMesaMakeCurrent failed!\n"); |
| return false; |
| } |
| |
| //Setup the framebuffers |
| SK_GL_DECL_PROC(PFNGLGENFRAMEBUFFERSEXTPROC, glGenFramebuffers) |
| SK_GL_DECL_PROC(PFNGLBINDFRAMEBUFFEREXTPROC, glBindFramebuffer) |
| SK_GL_DECL_PROC(PFNGLGENRENDERBUFFERSPROC, glGenRenderbuffers) |
| SK_GL_DECL_PROC(PFNGLBINDRENDERBUFFERPROC, glBindRenderbuffer) |
| SK_GL_DECL_PROC(PFNGLRENDERBUFFERSTORAGEPROC, glRenderbufferStorage) |
| SK_GL_DECL_PROC(PFNGLFRAMEBUFFERRENDERBUFFERPROC, glFramebufferRenderbuffer) |
| SK_GL_DECL_PROC(PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC, glCheckFramebufferStatus) |
| |
| const GLubyte* glExts = glGetString(GL_EXTENSIONS); |
| if (gluCheckExtension( |
| reinterpret_cast<const GLubyte*>("GL_ARB_framebuffer_object") |
| , glExts)) |
| { |
| SK_GL_GET_PROC(PFNGLGENFRAMEBUFFERSEXTPROC, glGenFramebuffers) |
| SK_GL_GET_PROC(PFNGLBINDFRAMEBUFFEREXTPROC, glBindFramebuffer) |
| SK_GL_GET_PROC(PFNGLGENRENDERBUFFERSPROC, glGenRenderbuffers) |
| SK_GL_GET_PROC(PFNGLBINDRENDERBUFFERPROC, glBindRenderbuffer) |
| SK_GL_GET_PROC(PFNGLRENDERBUFFERSTORAGEPROC, glRenderbufferStorage) |
| SK_GL_GET_PROC(PFNGLFRAMEBUFFERRENDERBUFFERPROC, glFramebufferRenderbuffer) |
| SK_GL_GET_PROC(PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC, glCheckFramebufferStatus) |
| |
| //osmesa on mac currently only supports EXT |
| } else if (gluCheckExtension( |
| reinterpret_cast<const GLubyte*>("GL_EXT_framebuffer_object") |
| , glExts)) |
| { |
| SK_GL_GET_EXT_PROC(PFNGLGENFRAMEBUFFERSEXTPROC, glGenFramebuffers) |
| SK_GL_GET_EXT_PROC(PFNGLBINDFRAMEBUFFEREXTPROC, glBindFramebuffer) |
| SK_GL_GET_EXT_PROC(PFNGLGENRENDERBUFFERSPROC, glGenRenderbuffers) |
| SK_GL_GET_EXT_PROC(PFNGLBINDRENDERBUFFERPROC, glBindRenderbuffer) |
| SK_GL_GET_EXT_PROC(PFNGLRENDERBUFFERSTORAGEPROC, glRenderbufferStorage) |
| SK_GL_GET_EXT_PROC(PFNGLFRAMEBUFFERRENDERBUFFERPROC, glFramebufferRenderbuffer) |
| SK_GL_GET_EXT_PROC(PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC, glCheckFramebufferStatus) |
| } else { |
| SkDebugf("GL_ARB_framebuffer_object not found.\n"); |
| return false; |
| } |
| |
| GLuint cbID; |
| GLuint dsID; |
| glGenFramebuffers_func(1, &fFBO); |
| glBindFramebuffer_func(GL_FRAMEBUFFER, fFBO); |
| |
| glGenRenderbuffers_func(1, &cbID); |
| glBindRenderbuffer_func(GL_RENDERBUFFER, cbID); |
| glRenderbufferStorage_func(GL_RENDERBUFFER, OSMESA_RGBA, width, height); |
| glFramebufferRenderbuffer_func(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, cbID); |
| |
| glGenRenderbuffers_func(1, &dsID); |
| glBindRenderbuffer_func(GL_RENDERBUFFER_EXT, dsID); |
| glRenderbufferStorage_func(GL_RENDERBUFFER, GL_STENCIL_INDEX8, width, height); |
| glFramebufferRenderbuffer_func(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, dsID); |
| |
| glViewport(0, 0, width, height); |
| glClearStencil(0); |
| glClear(GL_STENCIL_BUFFER_BIT); |
| |
| GLenum status = glCheckFramebufferStatus_func(GL_FRAMEBUFFER); |
| return GL_FRAMEBUFFER_COMPLETE == status; |
| } |