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#include <assert.h>
#include <string.h>
#include <wayland-egl.h>
#include "egl.h"
#include "log.h"
static const char *egl_error_string();
void egl_create_window(
struct egl *egl,
struct wl_surface *wl_surface,
uint32_t width,
uint32_t height)
{
egl->window = wl_egl_window_create(wl_surface, width, height);
if (egl->window == EGL_NO_SURFACE) {
egl_log_error("Couldn't create EGL window");
}
}
void egl_create_context(struct egl *egl, struct wl_display *wl_display)
{
egl->display = eglGetDisplay(wl_display);
if (egl->display == EGL_NO_DISPLAY) {
egl_log_error("Couldn't get EGL display");
return;
}
if (!eglInitialize(egl->display, NULL, NULL)) {
egl_log_error("Couldn't initialise EGL");
return;
}
EGLBoolean result;
EGLConfig config;
EGLint num_configs;
static const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_NONE
};
result = eglGetConfigs(egl->display, NULL, 0, &num_configs);
if ((result != EGL_TRUE) || (num_configs == 0)) {
egl_log_error("No EGL configs available");
return;
}
result = eglChooseConfig(
egl->display,
config_attribs,
&config,
1,
&num_configs);
if ((result != EGL_TRUE) || (num_configs != 1)) {
egl_log_error("Failed to choose EGL config");
return;
}
egl->surface = eglCreateWindowSurface(
egl->display,
config,
egl->window,
NULL);
if (egl->surface == EGL_NO_SURFACE) {
egl_log_error("Couldn't create EGL window surface");
return;
}
static const EGLint context_attribs[] = {
EGL_CONTEXT_MAJOR_VERSION, 3,
EGL_NONE
};
egl->context = eglCreateContext(
egl->display,
config,
EGL_NO_CONTEXT,
context_attribs);
if (egl->context == EGL_NO_CONTEXT) {
egl_log_error("Couldn't create EGL context");
return;
}
result = eglMakeCurrent(
egl->display,
egl->surface,
egl->surface,
egl->context);
if (!result) {
egl_log_error("Couldn't make EGL context current");
return;
}
}
void egl_log_error(const char *msg) {
log_error("%s: %s\n", msg, egl_error_string());
}
void egl_make_current(struct egl *egl) {
bool result = eglMakeCurrent(
egl->display,
egl->surface,
egl->surface,
egl->context);
if (!result) {
egl_log_error("Couldn't make EGL context current");
return;
}
}
void egl_swap_buffers(struct egl *egl) {
eglSwapBuffers(egl->display, egl->surface);
}
const char *egl_error_string() {
switch(eglGetError()) {
case EGL_SUCCESS:
return "EGL_SUCCESS";
case EGL_NOT_INITIALIZED:
return "EGL_NOT_INITIALIZED";
case EGL_BAD_ACCESS:
return "EGL_BAD_ACCESS";
case EGL_BAD_ALLOC:
return "EGL_BAD_ALLOC";
case EGL_BAD_ATTRIBUTE:
return "EGL_BAD_ATTRIBUTE";
case EGL_BAD_CONTEXT:
return "EGL_BAD_CONTEXT";
case EGL_BAD_CONFIG:
return "EGL_BAD_CONFIG";
case EGL_BAD_CURRENT_SURFACE:
return "EGL_BAD_CURRENT_SURFACE";
case EGL_BAD_DISPLAY:
return "EGL_BAD_DISPLAY";
case EGL_BAD_SURFACE:
return "EGL_BAD_SURFACE";
case EGL_BAD_MATCH:
return "EGL_BAD_MATCH";
case EGL_BAD_PARAMETER:
return "EGL_BAD_PARAMETER";
case EGL_BAD_NATIVE_PIXMAP:
return "EGL_BAD_NATIVE_PIXMAP";
case EGL_BAD_NATIVE_WINDOW:
return "EGL_BAD_NATIVE_WINDOW";
case EGL_CONTEXT_LOST:
return "EGL_CONTEXT_LOST";
}
return "Unknown EGL error";
}
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