From c039ddba14b1bd656255bcfb76dd74059b8a0e78 Mon Sep 17 00:00:00 2001
From: Rakarake <raka@rakarake.xyz>
Date: Thu, 18 Dec 2025 03:45:35 +0100
Subject: [PATCH] egl working with shader!

---
 glonkers.c | 114 ++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 73 insertions(+), 41 deletions(-)

diff --git a/glonkers.c b/glonkers.c
index 9df3978..54c71d9 100644
--- a/glonkers.c
+++ b/glonkers.c
@@ -167,54 +167,86 @@ wl_registry_listener = {
 };
 
 static void egl_init(struct client_state *state) {
-	EGLint major;
-	EGLint minor;
-	EGLint num_configs;
-	EGLint attribs[] = {
-		EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
-		EGL_NONE
-	};
+    EGLint major, minor, count, n, size;
+    EGLConfig *configs;
+    int i;
+    EGLint config_attribs[] = {
+	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+	EGL_RED_SIZE, 8,
+	EGL_GREEN_SIZE, 8,
+	EGL_BLUE_SIZE, 8,
+	EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+	EGL_NONE
+    };
 
-	state->egl_window = wl_egl_window_create(state->wl_surface, state->width,
-							state->height);
+    static const EGLint context_attribs[] = {
+	EGL_CONTEXT_CLIENT_VERSION, 2,
+	EGL_NONE
+    };
 
-	state->egl_display = eglGetDisplay((EGLNativeDisplayType) state->wl_display);
-	if(state->wl_display == EGL_NO_DISPLAY) {
-		fprintf(stderr, "Couldn't get EGL display\n");
-		exit(EXIT_FAILURE);
-	}
+    
+    state->egl_display = eglGetDisplay((EGLNativeDisplayType) state->wl_display);
+    if (state->egl_display == EGL_NO_DISPLAY) {
+	fprintf(stderr, "Can't create egl display\n");
+	exit(1);
+    } else {
+	fprintf(stderr, "Created egl display\n");
+    }
 
-	if(eglInitialize(state->egl_display, &major, &minor) != EGL_TRUE) {
-		fprintf(stderr, "Couldnt initialize EGL\n");
-		exit(EXIT_FAILURE);
-	}
+    if (eglInitialize(state->egl_display, &major, &minor) != EGL_TRUE) {
+	fprintf(stderr, "Can't initialise egl display\n");
+	exit(1);
+    }
+    printf("EGL major: %d, minor %d\n", major, minor);
 
-	if(eglChooseConfig(state->egl_display, attribs, &state->egl_config, 1,
-			&num_configs) != EGL_TRUE) {
-		fprintf(stderr, "Couldn't find matching EGL config\n");
-		exit(EXIT_FAILURE);
-	}
+    eglGetConfigs(state->egl_display, NULL, 0, &count);
+    printf("EGL has %d configs\n", count);
 
-	state->egl_surface = eglCreateWindowSurface(state->egl_display,
-							state->egl_config,
-							(EGLNativeWindowType) state->egl_window, NULL);
-	if(state->egl_surface == EGL_NO_SURFACE) {
-		fprintf(stderr, "Couldn't create EGL surface\n");
-		exit(EXIT_FAILURE);
-	}
+    configs = calloc(count, sizeof *configs);
+    
+    eglChooseConfig(state->egl_display, config_attribs,
+			  configs, count, &n);
+    
+    for (i = 0; i < n; i++) {
+	eglGetConfigAttrib(state->egl_display,
+			   configs[i], EGL_BUFFER_SIZE, &size);
+	printf("Buffer size for config %d is %d\n", i, size);
+	eglGetConfigAttrib(state->egl_display,
+			   configs[i], EGL_RED_SIZE, &size);
+	printf("Red size for config %d is %d\n", i, size);
+	
+	// just choose the first one
+	state->egl_config = configs[i];
+	break;
+    }
 
-	state->egl_context = eglCreateContext(state->egl_display, state->egl_config,
-							EGL_NO_CONTEXT, NULL);
-	if(state->egl_context == EGL_NO_CONTEXT) {
-		fprintf(stderr, "Couldn't create EGL context\n");
-		exit(EXIT_FAILURE);
-	}
+    state->egl_context =
+	eglCreateContext(state->egl_display,
+			 state->egl_config,
+			 EGL_NO_CONTEXT, context_attribs);
 
-	if(!eglMakeCurrent(state->egl_display, state->egl_surface,
-			state->egl_surface, state->egl_context)) {
-		fprintf(stderr, "Couldn't make EGL context current\n");
-		exit(EXIT_FAILURE);
-	}
+
+    // EGL window
+    state->egl_window = wl_egl_window_create(state->wl_surface,
+                              state->width, state->height);
+    if (state->egl_window == EGL_NO_SURFACE) {
+        fprintf(stderr, "Can't create egl window\n");
+        exit(1);
+    } else {
+        fprintf(stderr, "Created egl window\n");
+    }
+
+    state->egl_surface =
+        eglCreateWindowSurface(state->egl_display,
+                               state->egl_config,
+                               (unsigned long) state->egl_window, NULL);
+
+    if (eglMakeCurrent(state->egl_display, state->egl_surface,
+                       state->egl_surface, state->egl_context)) {
+        fprintf(stderr, "Made current\n");
+    } else {
+        fprintf(stderr, "Made current failed\n");
+    }
 }
 
 int