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#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <wayland-client.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include "egl-common.h"
EGLDisplay egl_display;
EGLConfig egl_config;
EGLContext egl_context;
PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT;
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC eglCreatePlatformWindowSurfaceEXT;
const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 1,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE,
};
const EGLint context_attribs[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE,
};
bool egl_init(struct wl_display *display) {
const char *client_exts_str =
eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
if (client_exts_str == NULL) {
if (eglGetError() == EGL_BAD_DISPLAY) {
fprintf(stderr, "EGL_EXT_client_extensions not supported\n");
} else {
fprintf(stderr, "Failed to query EGL client extensions\n");
}
return false;
}
if (!strstr(client_exts_str, "EGL_EXT_platform_base")) {
fprintf(stderr, "EGL_EXT_platform_base not supported\n");
return false;
}
if (!strstr(client_exts_str, "EGL_EXT_platform_wayland")) {
fprintf(stderr, "EGL_EXT_platform_wayland not supported\n");
return false;
}
eglGetPlatformDisplayEXT =
(void *)eglGetProcAddress("eglGetPlatformDisplayEXT");
if (eglGetPlatformDisplayEXT == NULL) {
fprintf(stderr, "Failed to get eglGetPlatformDisplayEXT\n");
return false;
}
eglCreatePlatformWindowSurfaceEXT =
(void *)eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
if (eglCreatePlatformWindowSurfaceEXT == NULL) {
fprintf(stderr, "Failed to get eglCreatePlatformWindowSurfaceEXT\n");
return false;
}
egl_display =
eglGetPlatformDisplayEXT(EGL_PLATFORM_WAYLAND_EXT,
display, NULL);
if (egl_display == EGL_NO_DISPLAY) {
fprintf(stderr, "Failed to create EGL display\n");
goto error;
}
if (eglInitialize(egl_display, NULL, NULL) == EGL_FALSE) {
fprintf(stderr, "Failed to initialize EGL\n");
goto error;
}
EGLint matched = 0;
if (!eglChooseConfig(egl_display, config_attribs,
&egl_config, 1, &matched)) {
fprintf(stderr, "eglChooseConfig failed\n");
goto error;
}
if (matched == 0) {
fprintf(stderr, "Failed to match an EGL config\n");
goto error;
}
egl_context =
eglCreateContext(egl_display, egl_config,
EGL_NO_CONTEXT, context_attribs);
if (egl_context == EGL_NO_CONTEXT) {
fprintf(stderr, "Failed to create EGL context\n");
goto error;
}
return true;
error:
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE,
EGL_NO_SURFACE, EGL_NO_CONTEXT);
if (egl_display) {
eglTerminate(egl_display);
}
eglReleaseThread();
return false;
}
void egl_finish(void) {
eglMakeCurrent(egl_display, EGL_NO_SURFACE,
EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroyContext(egl_display, egl_context);
eglTerminate(egl_display);
eglReleaseThread();
}
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