129 lines
4.5 KiB
C++
129 lines
4.5 KiB
C++
#include <mbgl/platform/default/headless_view.hpp>
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#include <mbgl/platform/default/headless_display.hpp>
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#include <mbgl/platform/log.hpp>
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#include <cassert>
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#include <GL/glx.h>
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namespace mbgl {
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gl::glProc HeadlessView::initializeExtension(const char* name) {
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return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
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}
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void HeadlessView::createContext() {
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xDisplay = display->xDisplay;
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fbConfigs = display->fbConfigs;
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if (!glContext) {
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// Try to create a legacy context
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glContext = glXCreateNewContext(xDisplay, fbConfigs[0], GLX_RGBA_TYPE, None, True);
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if (glContext) {
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if (!glXIsDirect(xDisplay, glContext)) {
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Log::Error(Event::OpenGL, "failed to create direct OpenGL Legacy context");
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glXDestroyContext(xDisplay, glContext);
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glContext = nullptr;
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}
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}
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}
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if (glContext == nullptr) {
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throw std::runtime_error("Error creating GL context object.");
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}
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// Create a dummy pbuffer. We will render to framebuffers anyway, but we need a pbuffer to
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// activate the context.
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int pbufferAttributes[] = {
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GLX_PBUFFER_WIDTH, 8,
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GLX_PBUFFER_HEIGHT, 8,
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None
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};
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glxPbuffer = glXCreatePbuffer(xDisplay, fbConfigs[0], pbufferAttributes);
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}
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void HeadlessView::destroyContext() {
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if (glxPbuffer) {
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glXDestroyPbuffer(xDisplay, glxPbuffer);
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glxPbuffer = 0;
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}
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glXDestroyContext(xDisplay, glContext);
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}
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void HeadlessView::resizeFramebuffer() {
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const unsigned int w = dimensions[0] * pixelRatio;
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const unsigned int h = dimensions[1] * pixelRatio;
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// Create depth/stencil buffer
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MBGL_CHECK_ERROR(glGenRenderbuffersEXT(1, &fboDepthStencil));
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MBGL_CHECK_ERROR(glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fboDepthStencil));
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MBGL_CHECK_ERROR(glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, w, h));
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MBGL_CHECK_ERROR(glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0));
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MBGL_CHECK_ERROR(glGenRenderbuffersEXT(1, &fboColor));
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MBGL_CHECK_ERROR(glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fboColor));
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MBGL_CHECK_ERROR(glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA8, w, h));
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MBGL_CHECK_ERROR(glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0));
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MBGL_CHECK_ERROR(glGenFramebuffersEXT(1, &fbo));
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MBGL_CHECK_ERROR(glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo));
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MBGL_CHECK_ERROR(glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, fboColor));
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MBGL_CHECK_ERROR(glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER_EXT, fboDepthStencil));
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GLenum status = MBGL_CHECK_ERROR(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
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std::string error("Couldn't create framebuffer: ");
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switch (status) {
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case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT: (error += "incomplete attachment"); break;
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case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT: error += "incomplete missing attachment"; break;
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case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT: error += "incomplete dimensions"; break;
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case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT: error += "incomplete formats"; break;
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case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT: error += "incomplete draw buffer"; break;
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case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT: error += "incomplete read buffer"; break;
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case GL_FRAMEBUFFER_UNSUPPORTED: error += "unsupported"; break;
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default: error += "other"; break;
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}
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throw std::runtime_error(error);
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}
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MBGL_CHECK_ERROR(glViewport(0, 0, w, h));
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}
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void HeadlessView::clearBuffers() {
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assert(active);
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MBGL_CHECK_ERROR(glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0));
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if (fbo) {
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MBGL_CHECK_ERROR(glDeleteFramebuffersEXT(1, &fbo));
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fbo = 0;
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}
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if (fboColor) {
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MBGL_CHECK_ERROR(glDeleteRenderbuffersEXT(1, &fboColor));
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fboColor = 0;
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}
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if (fboDepthStencil) {
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MBGL_CHECK_ERROR(glDeleteRenderbuffersEXT(1, &fboDepthStencil));
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fboDepthStencil = 0;
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}
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}
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void HeadlessView::activateContext() {
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if (!glXMakeContextCurrent(xDisplay, glxPbuffer, glxPbuffer, glContext)) {
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throw std::runtime_error("Switching OpenGL context failed.\n");
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}
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}
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void HeadlessView::deactivateContext() {
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if (!glXMakeContextCurrent(xDisplay, 0, 0, nullptr)) {
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throw std::runtime_error("Removing OpenGL context failed.\n");
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}
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}
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} // namespace mbgl
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