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#include "headless_view.hpp"
#include "headless_display.hpp"
#include <stdexcept>
#include <sstream>
#include <string>
#if MBGL_USE_GLX
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display *, GLXFBConfig, GLXContext, Bool, const int *);
static glXCreateContextAttribsARBProc glXCreateContextAttribsARB = nullptr;
#endif
namespace mbgl {
HeadlessView::HeadlessView()
: display_(std::make_shared<HeadlessDisplay>()) {
createContext();
}
HeadlessView::HeadlessView(std::shared_ptr<HeadlessDisplay> display)
: display_(display) {
createContext();
}
void HeadlessView::createContext() {
#if MBGL_USE_CGL
CGLError error = CGLCreateContext(display_->pixelFormat, NULL, &gl_context);
if (error) {
throw std::runtime_error("Error creating GL context object\n");
}
error = CGLEnable(gl_context, kCGLCEMPEngine);
if (error != kCGLNoError ) {
throw std::runtime_error("Error enabling OpenGL multithreading\n");
}
#endif
#if MBGL_USE_GLX
if (glXCreateContextAttribsARB == nullptr) {
glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)glXGetProcAddressARB((const GLubyte *)"glXCreateContextAttribsARB");
}
if (glXCreateContextAttribsARB == nullptr) {
throw std::runtime_error("Cannot find glXCreateContextAttribsARB");
}
x_display = display_->x_display;
fb_configs = display_->fb_configs;
int context_attributes[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 2,
GLX_CONTEXT_MINOR_VERSION_ARB, 1,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
None
};
gl_context = glXCreateContextAttribsARB(x_display, fb_configs[0], 0, True, context_attributes);
if (gl_context == nullptr) {
throw std::runtime_error("Error creating GL context object");
}
int pbuffer_attributes[] = {
GLX_PBUFFER_WIDTH, 32,
GLX_PBUFFER_HEIGHT, 32,
None
};
glx_pbuffer = glXCreatePbuffer(x_display, fb_configs[0], pbuffer_attributes);
#endif
}
void HeadlessView::resize(uint16_t width, uint16_t height, float pixelRatio) {
clear_buffers();
width_ = width;
height_ = height;
pixelRatio_ = pixelRatio;
const unsigned int w = width_ * pixelRatio_;
const unsigned int h = height_ * pixelRatio_;
make_active();
// Create depth/stencil buffer
glGenRenderbuffersEXT(1, &fbo_depth_stencil);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo_depth_stencil);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, w, h);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
glGenRenderbuffersEXT(1, &fbo_color);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo_color);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA8, w, h);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
glGenFramebuffersEXT(1, &fbo);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, fbo_color);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER_EXT, fbo_depth_stencil);
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
std::stringstream error("Couldn't create framebuffer: ");
switch (status) {
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT: (error << "incomplete attachment\n"); break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT: error << "incomplete missing attachment\n"; break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT: error << "incomplete dimensions\n"; break;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT: error << "incomplete formats\n"; break;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT: error << "incomplete draw buffer\n"; break;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT: error << "incomplete read buffer\n"; break;
case GL_FRAMEBUFFER_UNSUPPORTED: error << "unsupported\n"; break;
default: error << "other\n"; break;
}
throw std::runtime_error(error.str());
}
make_inactive();
}
const std::unique_ptr<uint32_t[]> HeadlessView::readPixels() {
const unsigned int w = width_ * pixelRatio_;
const unsigned int h = height_ * pixelRatio_;
std::unique_ptr<uint32_t[]> pixels(new uint32_t[w * h]);
make_active();
glReadPixels(0, 0, width_, height_, GL_RGBA, GL_UNSIGNED_BYTE, pixels.get());
make_inactive();
return pixels;
}
void HeadlessView::clear_buffers() {
make_active();
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
if (fbo) {
glDeleteFramebuffersEXT(1, &fbo);
fbo = 0;
}
if (fbo_color) {
glDeleteTextures(1, &fbo_color);
fbo_color = 0;
}
if (fbo_depth_stencil) {
glDeleteRenderbuffersEXT(1, &fbo_depth_stencil);
fbo_depth_stencil = 0;
}
make_inactive();
}
HeadlessView::~HeadlessView() {
clear_buffers();
#if MBGL_USE_CGL
CGLDestroyContext(gl_context);
#endif
#if MBGL_USE_GLX
if (glx_pbuffer) {
glXDestroyPbuffer(x_display, glx_pbuffer);
glx_pbuffer = 0;
}
glXDestroyContext(x_display, gl_context);
#endif
}
void HeadlessView::notify() {
// no-op
}
void HeadlessView::notify_map_change(mbgl::MapChange /*change*/, mbgl::timestamp /*delay*/) {
// no-op
}
void HeadlessView::make_active() {
#if MBGL_USE_CGL
CGLError error = CGLSetCurrentContext(gl_context);
if (error) {
throw std::runtime_error("Switching OpenGL context failed\n");
}
#endif
#if MBGL_USE_GLX
if (!glXMakeContextCurrent(x_display, glx_pbuffer, glx_pbuffer, gl_context)) {
throw std::runtime_error("Switching OpenGL context failed\n");
}
#endif
}
void HeadlessView::make_inactive() {
#if MBGL_USE_CGL
CGLError error = CGLSetCurrentContext(nullptr);
if (error) {
throw std::runtime_error("Removing OpenGL context failed\n");
}
#endif
#if MBGL_USE_GLX
if (!glXMakeContextCurrent(x_display, 0, 0, nullptr)) {
throw std::runtime_error("Removing OpenGL context failed\n");
}
#endif
}
void HeadlessView::swap() {}
unsigned int HeadlessView::root_fbo() {
#if MBGL_USE_CGL
return fbo;
#endif
return 0;
}
}
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