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#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES3/gl3.h>
#include <gbm.h> // GBM_FORMAT_XRGB8888
#include <wlr/util/log.h>
#include "backend/egl.h"
const char *egl_error(void) {
switch (eglGetError()) {
case EGL_SUCCESS:
return "Success";
case EGL_NOT_INITIALIZED:
return "Not initialized";
case EGL_BAD_ACCESS:
return "Bad access";
case EGL_BAD_ALLOC:
return "Bad alloc";
case EGL_BAD_ATTRIBUTE:
return "Bad attribute";
case EGL_BAD_CONTEXT:
return "Bad Context";
case EGL_BAD_CONFIG:
return "Bad Config";
case EGL_BAD_CURRENT_SURFACE:
return "Bad current surface";
case EGL_BAD_DISPLAY:
return "Bad display";
case EGL_BAD_SURFACE:
return "Bad surface";
case EGL_BAD_MATCH:
return "Bad match";
case EGL_BAD_PARAMETER:
return "Bad parameter";
case EGL_BAD_NATIVE_PIXMAP:
return "Bad native pixmap";
case EGL_BAD_NATIVE_WINDOW:
return "Bad native window";
case EGL_CONTEXT_LOST:
return "Context lost";
default:
return "Unknown";
}
}
// EGL extensions
PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display;
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC create_platform_window_surface;
static bool egl_exts() {
get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
eglGetProcAddress("eglGetPlatformDisplayEXT");
if (!get_platform_display) {
wlr_log(L_ERROR, "Failed to load EGL extension 'eglGetPlatformDisplayEXT'");
return false;
}
create_platform_window_surface = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
if (!get_platform_display) {
wlr_log(L_ERROR,
"Failed to load EGL extension 'eglCreatePlatformWindowSurfaceEXT'");
return false;
}
return true;
}
static bool egl_get_config(EGLDisplay disp, EGLConfig *out, EGLenum platform) {
EGLint count = 0, matched = 0, ret;
ret = eglGetConfigs(disp, NULL, 0, &count);
if (ret == EGL_FALSE || count == 0) {
wlr_log(L_ERROR, "eglGetConfigs returned no configs");
return false;
}
EGLConfig configs[count];
ret = eglChooseConfig(disp, NULL, configs, count, &matched);
if (ret == EGL_FALSE) {
wlr_log(L_ERROR, "eglChooseConfig failed");
return false;
}
for (int i = 0; i < matched; ++i) {
EGLint gbm_format;
if (platform == EGL_PLATFORM_WAYLAND_EXT) {
*out = configs[i];
return true;
}
if (!eglGetConfigAttrib(disp,
configs[i],
EGL_NATIVE_VISUAL_ID,
&gbm_format)) {
continue;
}
if (gbm_format == GBM_FORMAT_ARGB8888) {
*out = configs[i];
return true;
}
}
wlr_log(L_ERROR, "no valid egl config found");
return false;
}
bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display) {
if (!egl_exts()) {
return false;
}
if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
wlr_log(L_ERROR, "Failed to bind to the OpenGL ES API: %s", egl_error());
goto error;
}
egl->display = get_platform_display(platform, display, NULL);
if (egl->display == EGL_NO_DISPLAY) {
wlr_log(L_ERROR, "Failed to create EGL display: %s", egl_error());
goto error;
}
EGLint major, minor;
if (eglInitialize(egl->display, &major, &minor) == EGL_FALSE) {
wlr_log(L_ERROR, "Failed to initialize EGL: %s", egl_error());
goto error;
}
if (!egl_get_config(egl->display, &egl->config, platform)) {
wlr_log(L_ERROR, "Failed to get EGL config");
goto error;
}
static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
egl->context = eglCreateContext(egl->display, egl->config,
EGL_NO_CONTEXT, attribs);
if (egl->context == EGL_NO_CONTEXT) {
wlr_log(L_ERROR, "Failed to create EGL context: %s", egl_error());
goto error;
}
eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, egl->context);
wlr_log(L_INFO, "Using EGL %d.%d", (int)major, (int)minor);
wlr_log(L_INFO, "Supported EGL extensions: %s", eglQueryString(egl->display,
EGL_EXTENSIONS));
wlr_log(L_INFO, "Using %s", glGetString(GL_VERSION));
wlr_log(L_INFO, "Supported OpenGL ES extensions: %s", glGetString(GL_EXTENSIONS));
return true;
error:
eglTerminate(egl->display);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
return false;
}
void wlr_egl_free(struct wlr_egl *egl) {
eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroyContext(egl->display, egl->context);
eglTerminate(egl->display);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window) {
EGLSurface surf = create_platform_window_surface(egl->display, egl->config,
window, NULL);
if (surf == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface: %s", egl_error());
return EGL_NO_SURFACE;
}
return surf;
}
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