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#include "../../../include/mgl/graphics/backend/egl.h"
#include "../../../include/mgl/mgl.h"
#include <stdlib.h>
#include <stdio.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xrender.h>
static void mgl_graphics_egl_deinit(mgl_graphics *self);
typedef struct {
EGLDisplay display;
EGLSurface surface;
EGLContext context;
EGLConfig *configs;
EGLConfig ecfg;
XVisualInfo *visual_info;
} mgl_graphics_egl;
static int32_t mgl_graphics_egl_get_config_attrib(mgl_graphics_egl *self, EGLConfig ecfg, int32_t attribute_name) {
mgl_context *context = mgl_get_context();
int32_t value = 0;
context->gl.eglGetConfigAttrib(self->display, ecfg, attribute_name, &value);
return value;
}
static bool xvisual_match_alpha(Display *dpy, XVisualInfo *visual_info, bool alpha) {
XRenderPictFormat *pict_format = XRenderFindVisualFormat(dpy, visual_info->visual);
if(!pict_format)
return false;
return (alpha && pict_format->direct.alphaMask > 0) || (!alpha && pict_format->direct.alphaMask == 0);
}
static bool mgl_graphics_egl_choose_config(mgl_graphics_egl *self, mgl_context *context, bool alpha) {
self->configs = NULL;
self->ecfg = NULL;
self->visual_info = NULL;
int32_t num_configs = 0;
context->gl.eglGetConfigs(self->display, NULL, 0, &num_configs);
if(num_configs == 0) {
fprintf(stderr, "mgl error: mgl_graphics_egl_choose_config: no configs found\n");
return false;
}
self->configs = (EGLConfig*)calloc(num_configs, sizeof(EGLConfig));
if(!self->configs) {
fprintf(stderr, "mgl error: mgl_graphics_egl_choose_config: failed to allocate %d configs\n", (int)num_configs);
return false;
}
context->gl.eglGetConfigs(self->display, self->configs, num_configs, &num_configs);
for(int i = 0; i < num_configs; i++) {
self->ecfg = self->configs[i];
//if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_RENDERABLE_TYPE) != EGL_OPENGL_ES2_BIT)
// continue;
if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_COLOR_BUFFER_TYPE) != EGL_RGB_BUFFER)
continue;
if(!(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_SURFACE_TYPE) & EGL_WINDOW_BIT))
continue;
if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_RED_SIZE) != 8)
continue;
if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_GREEN_SIZE) != 8)
continue;
if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_BLUE_SIZE) != 8)
continue;
if(mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_ALPHA_SIZE) != (alpha ? 8 : 0))
continue;
if(context->window_system == MGL_WINDOW_SYSTEM_WAYLAND)
break;
XVisualInfo vi = {0};
vi.visualid = mgl_graphics_egl_get_config_attrib(self, self->ecfg, EGL_NATIVE_VISUAL_ID);
if(!vi.visualid)
continue;
int vis_count = 0;
self->visual_info = XGetVisualInfo(context->connection, VisualIDMask, &vi, &vis_count);
if(!self->visual_info)
continue;
if(xvisual_match_alpha(context->connection, self->visual_info, alpha)) {
break;
} else {
XFree(self->visual_info);
self->visual_info = NULL;
self->ecfg = NULL;
}
}
if(!self->ecfg) {
fprintf(stderr, "mgl error: mgl_graphics_egl_choose_config: no appropriate glx config found\n");
return false;
}
if(context->window_system == MGL_WINDOW_SYSTEM_X11 && !self->visual_info) {
fprintf(stderr, "mgl error: mgl_graphics_egl_choose_config: no appropriate visual found\n");
return false;
}
return true;
}
static bool mgl_graphics_egl_make_context_current(mgl_graphics *self, mgl_window_handle window) {
(void)window;
mgl_graphics_egl *impl = self->impl;
mgl_context *context = mgl_get_context();
if(!impl->surface) {
impl->surface = context->gl.eglCreateWindowSurface(impl->display, impl->ecfg, (EGLNativeWindowType)window, NULL);
if(!impl->surface) {
fprintf(stderr, "mgl error: mgl_graphics_egl_make_context_current: failed to create window surface\n");
return false;
}
}
return context->gl.eglMakeCurrent(impl->display, impl->surface, impl->surface, impl->context) != 0;
}
static void mgl_graphics_egl_swap_buffers(mgl_graphics *self, mgl_window_handle window) {
(void)window;
mgl_graphics_egl *impl = self->impl;
mgl_context *context = mgl_get_context();
context->gl.eglSwapBuffers(impl->display, impl->surface);
}
static bool mgl_graphics_egl_set_swap_interval(mgl_graphics *self, mgl_window_handle window, bool enabled) {
(void)window;
mgl_graphics_egl *impl = self->impl;
mgl_context *context = mgl_get_context();
return context->gl.eglSwapInterval(impl->display, (int32_t)enabled) == 1;
}
static void* mgl_graphics_egl_get_xvisual_info(mgl_graphics *self) {
mgl_graphics_egl *impl = self->impl;
return impl->visual_info;
}
static void* mgl_graphics_egl_get_display(mgl_graphics *self) {
mgl_graphics_egl *impl = self->impl;
return impl->display;
}
static void* mgl_graphics_egl_get_context(mgl_graphics *self) {
mgl_graphics_egl *impl = self->impl;
return impl->context;
}
bool mgl_graphics_egl_init(mgl_graphics *self) {
mgl_graphics_egl *impl = calloc(1, sizeof(mgl_graphics_egl));
if(!impl)
return false;
self->deinit = mgl_graphics_egl_deinit;
self->make_context_current = mgl_graphics_egl_make_context_current;
self->swap_buffers = mgl_graphics_egl_swap_buffers;
self->set_swap_interval = mgl_graphics_egl_set_swap_interval;
self->get_xvisual_info = mgl_graphics_egl_get_xvisual_info;
self->get_display = mgl_graphics_egl_get_display;
self->get_context = mgl_graphics_egl_get_context;
self->impl = impl;
const int32_t ctxattr[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE, EGL_NONE
};
mgl_context *context = mgl_get_context();
context->gl.eglBindAPI(EGL_OPENGL_API);
impl->display = context->gl.eglGetDisplay((EGLNativeDisplayType)context->connection);
if(!impl->display) {
fprintf(stderr, "mgl error: mgl_graphics_egl_init: eglGetDisplay failed\n");
mgl_graphics_egl_deinit(self);
return false;
}
if(!context->gl.eglInitialize(impl->display, NULL, NULL)) {
fprintf(stderr, "mgl error: mgl_graphics_egl_init: eglInitialize failed\n");
mgl_graphics_egl_deinit(self);
return false;
}
if(!mgl_graphics_egl_choose_config(impl, context, self->alpha)) {
mgl_graphics_egl_deinit(self);
return false;
}
impl->context = context->gl.eglCreateContext(impl->display, impl->ecfg, NULL, ctxattr);
if(!impl->context) {
fprintf(stderr, "mgl error: mgl_graphics_egl_init: failed to create egl context\n");
mgl_graphics_egl_deinit(self);
return false;
}
return true;
}
void mgl_graphics_egl_deinit(mgl_graphics *self) {
mgl_graphics_egl *impl = self->impl;
if(!impl)
return;
mgl_context *context = mgl_get_context();
if(impl->visual_info) {
XFree(impl->visual_info);
impl->visual_info = NULL;
}
if(impl->configs) {
free(impl->configs);
impl->configs = NULL;
}
if(impl->context) {
context->gl.eglMakeCurrent(impl->display, NULL, NULL, NULL);
context->gl.eglDestroyContext(impl->display, impl->context);
impl->context = NULL;
}
if(impl->surface) {
context->gl.eglDestroySurface(impl->display, impl->surface);
impl->surface = NULL;
}
if(impl->display) {
context->gl.eglTerminate(impl->display);
impl->display = NULL;
}
if(impl->visual_info) {
XFree(impl->visual_info);
impl->visual_info = NULL;
}
free(self->impl);
self->impl = NULL;
}
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