1 files changed, 147 insertions, 0 deletions
diff --git a/core/surface/egl.c b/core/surface/egl.c
new file mode 100644
index 0000000..f0370ce
--- /dev/null
+++ b/core/surface/egl.c
@@ -0,0 +1,147 @@
+#include "core/event.h"
+#include "core/renderer.h"
+#include "core/window.h"
+#include "internal/utils.h"
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Get human-readable EGL error string */
+const char *egl_error_string(EGLint error) {
+  switch (error) {
+  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_CONFIG:
+    return "EGL_BAD_CONFIG";
+  case EGL_BAD_CONTEXT:
+    return "EGL_BAD_CONTEXT";
+  case EGL_BAD_CURRENT_SURFACE:
+    return "EGL_BAD_CURRENT_SURFACE";
+  case EGL_BAD_DISPLAY:
+    return "EGL_BAD_DISPLAY";
+  case EGL_BAD_MATCH:
+    return "EGL_BAD_MATCH";
+  case EGL_BAD_NATIVE_PIXMAP:
+    return "EGL_BAD_NATIVE_PIXMAP";
+  case EGL_BAD_NATIVE_WINDOW:
+    return "EGL_BAD_NATIVE_WINDOW";
+  case EGL_BAD_PARAMETER:
+    return "EGL_BAD_PARAMETER";
+  case EGL_BAD_SURFACE:
+    return "EGL_BAD_SURFACE";
+  case EGL_CONTEXT_LOST:
+    return "EGL_CONTEXT_LOST";
+  default:
+    return "UNKNOWN_EGL_ERROR";
+  }
+}
+
+/* Crash with EGL error information
+ * */
+void crash_egl(const char *expr, const char *file, int line) {
+  EGLint error = eglGetError();
+  fprintf(stderr, "EGL Error at %s:%d\n", file, line);
+  fprintf(stderr, "Expression: %s\n", expr);
+  fprintf(stderr, "Error code: 0x%x (%s)\n", error, egl_error_string(error));
+  abort();
+}
+
+/* Macro for checking EGL boolean returns (EGL_TRUE/EGL_FALSE) */
+#define assert_egl(expr)                                                       \
+  do {                                                                         \
+    if (!(expr))                                                               \
+      crash_egl(#expr, __FILE__, __LINE__);                                    \
+  } while (0)
+
+void RuimInitEGL(RuimToplevel *toplevel) {
+  RuimSurfaceEGL ruimSurface;
+  EGLint version_major, version_minor;
+  EGLConfig config;
+  EGLint num_config;
+  struct toplevel_x11 *x11_toplevel = (struct toplevel_x11 *)toplevel->data;
+  struct backend_x11 *x11_backend =
+      (struct backend_x11 *)toplevel->backend->data;
+  EGLint constraints[] = {
+      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_ALPHA_SIZE,
+      8,
+      EGL_DEPTH_SIZE,
+      24,
+      EGL_NONE,
+  };
+
+  /* egl-contexts collect all state descriptions needed required for operation
+   */
+  EGLint ctxattr[] = {EGL_CONTEXT_MAJOR_VERSION, 3, EGL_CONTEXT_MINOR_VERSION,
+                      0, EGL_NONE};
+
+  const char *client_extensions =
+      eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
+
+  if (!client_extensions) {
+    abort();
+  }
+  if (!strstr(client_extensions, "EGL_EXT_platform_xcb")) {
+    abort();
+  }
+
+  ruimSurface.display = eglGetPlatformDisplay(EGL_PLATFORM_XCB_EXT,
+                                              x11_backend->connection, NULL);
+
+  assert_egl(ruimSurface.display);
+
+  assert_egl(
+      eglInitialize(ruimSurface.display, &version_major, &version_minor));
+  ;
+  assert_egl(eglChooseConfig(ruimSurface.display, constraints, &config, 1,
+                             &num_config));
+  assert_egl(eglBindAPI(EGL_OPENGL_ES_API));
+
+  ruimSurface.surface = eglCreatePlatformWindowSurface(
+      ruimSurface.display, config, &x11_toplevel->window, NULL);
+  assert_egl(ruimSurface.surface);
+
+  ruimSurface.context =
+      eglCreateContext(ruimSurface.display, config, EGL_NO_CONTEXT, ctxattr);
+  assert_egl(ruimSurface.context);
+
+  assert_egl(eglMakeCurrent(ruimSurface.display, ruimSurface.surface,
+                            ruimSurface.surface, ruimSurface.context));
+  assert_egl(eglSwapInterval(ruimSurface.display, 1));
+
+  x11_backend->surface = ruimSurface;
+}
+
+EGLBoolean RuimSwapEGL(RuimToplevel *toplevel) {
+  struct backend_x11 *x11_backend =
+      (struct backend_x11 *)toplevel->backend->data;
+
+  return eglSwapBuffers(x11_backend->surface.display,
+                        x11_backend->surface.surface);
+}
+
+void RuimDeinitEGL(RuimSurfaceEGL *eglCtx) {
+  assert_egl(eglMakeCurrent(eglCtx->display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                            EGL_NO_CONTEXT));
+  assert_egl(eglDestroyContext(eglCtx->display, eglCtx->context));
+  assert_egl(eglDestroySurface(eglCtx->display, eglCtx->surface));
+  assert_egl(eglTerminate(eglCtx->display));
+}