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