added graphics.h

1 files changed, 79 insertions, 0 deletions

diff --git a/graphics.c b/graphics.c
new file mode 100644
index 0000000..33febff
--- /dev/null
+++ b/graphics.c
@@ -0,0 +1,79 @@
+#include "graphics.h"
+
+bool init_gl(client_state* state) {
+    EGLint attrs[] = {
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+        EGL_CONFORMANT, EGL_OPENGL_BIT,
+        EGL_RED_SIZE, 8,
+        EGL_GREEN_SIZE, 8,
+        EGL_BLUE_SIZE, 8,
+        EGL_ALPHA_SIZE, 8,
+        EGL_DEPTH_SIZE, 24,
+        EGL_NONE
+    };
+
+    state->egl_window = wl_egl_window_create(state->surface, state->width, state->height);
+    if (!state->egl_window) {
+        fprintf(stderr, "ewindow\n");
+		return false;
+    }
+
+
+    state->egl_display = eglGetDisplay(state->display);
+    if (state->egl_display == EGL_NO_DISPLAY)  {
+        fprintf(stderr, "edisplay\n");
+		return false;
+    }
+    {
+        EGLint major, minor;
+        if (eglInitialize(state->egl_display, &major, &minor) != EGL_TRUE) {
+            fprintf(stderr, "eglinit\n");
+            return false;
+        }
+
+        printf("EGL version %u.%u\n", major, minor);
+    }
+    eglBindAPI(EGL_OPENGL_API);
+
+    EGLint num_configs;
+    if (eglChooseConfig(state->egl_display, attrs, &state->egl_config, 1, &num_configs) != EGL_TRUE) {
+        fprintf(stderr, "econfig: %d\n", eglGetError());
+        return false;
+    }
+
+    state->egl_surface = eglCreateWindowSurface(state->egl_display, state->egl_config,
+                                            (EGLNativeWindowType)state->egl_window, NULL);
+    if (state->egl_surface == EGL_NO_SURFACE) {
+        fprintf(stderr, "esurface\n");
+        return false;
+    }
+
+    state->egl_context = eglCreateContext(state->egl_display, state->egl_config,
+                                          EGL_NO_CONTEXT, NULL);
+    if (state->egl_context == EGL_NO_CONTEXT) {
+        fprintf(stderr, "econtext: %x\n", eglGetError());
+        return false;
+    }
+
+    eglMakeCurrent(state->egl_display, state->egl_surface, state->egl_surface, state->egl_context);
+
+    if (!gladLoadGL()) {
+        fprintf(stderr, "gladLoadGL");
+        return false;
+    }
+
+    {
+        GLint major, minor;
+        glGetIntegerv(GL_MAJOR_VERSION, &major);
+        glGetIntegerv(GL_MINOR_VERSION, &minor);
+        printf("GL version %u.%u\n", major, minor);
+    }
+
+	return true;
+}
+
+void render_frame(client_state *state) {
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+	eglSwapBuffers(state->egl_display, state->egl_surface);
+}