From 8236007a784f07572cdcb5f8d45c87d6729e82e7 Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Thu, 15 Mar 2012 13:35:32 +0100
Subject: wimmel_gl: Use a GLES2 context

Makes it easier to check that only non-deprecated stuff is used.
---
 Makefile    |  2 +-
 wimmel_gl.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 79 insertions(+), 22 deletions(-)

diff --git a/Makefile b/Makefile
index 0156d6c..2f72437 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ wimmel_gl: wimmel_gl.o util.o
 
 
 wimmel_gl:
-	$(CC) $(LDFLAGS) `pkg-config --cflags --libs egl gl` -o $@ $+
+	$(CC) $(LDFLAGS) `pkg-config --cflags --libs egl glesv2` -o $@ $+
 
 clean:
 	rm -f $(PROGS) $(OBJS)
diff --git a/wimmel_gl.c b/wimmel_gl.c
index 6610a5b..5fbf942 100644
--- a/wimmel_gl.c
+++ b/wimmel_gl.c
@@ -5,14 +5,18 @@
 #define GL_GLEXT_PROTOTYPES
 
 #ifndef GLUT
+
 #include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
 #else
-#include <GL/glut.h>
-#endif
 
+#include <GL/glut.h>
 #include <GL/gl.h>
 #include <GL/glext.h>
 
+#endif
+
 #include "util.h"
 
 #ifndef GLUT
@@ -218,19 +222,71 @@ init_gl(int argc, char **argv)
 {
 	GLuint fb, rb;
 #ifndef GLUT
+	EGLint ctx_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+#if 0
+	EGLint attribs[] = {
+		EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+		EGL_RED_SIZE, 1,
+		EGL_GREEN_SIZE, 1,
+		EGL_BLUE_SIZE, 1,
+		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+		EGL_NONE
+	};
+	EGLint pbuf_attribs[] = {
+		EGL_WIDTH, width,
+		EGL_HEIGHT, height,
+#if 0
+		EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB,
+		EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
+#endif
+		EGL_NONE
+	};
+	EGLSurface surf;
+	EGLConfig conf;
+	EGLint num_conf;
+#endif
+	EGLContext ctx;
+
 	dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+
 	eglInitialize(dpy, NULL, NULL);
-	eglBindAPI(EGL_OPENGL_API);
-	EGLContext ctx = eglCreateContext(dpy, NULL, EGL_NO_CONTEXT, NULL);
+	eglBindAPI(EGL_OPENGL_ES_API);
+#if 0
+	if (!eglChooseConfig(dpy, attribs, &conf, 1, &num_conf) || !num_conf) {
+		printf("eglChooseConfig() failed\n");
+		exit(EXIT_FAILURE);
+	}
+#endif
+	ctx = eglCreateContext(dpy, NULL, EGL_NO_CONTEXT, ctx_attribs);
 	if (ctx == NULL) {
 		fprintf(stderr, "failed to create context\n");
 		exit(EXIT_FAILURE);
 	}
-
 	if (!eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, ctx)) {
 		fprintf(stderr, "failed to make context current\n");
 		exit(EXIT_FAILURE);
 	}
+#if 0
+	ctx = eglCreateContext(dpy, conf, EGL_NO_CONTEXT, ctx_attribs);
+	if (ctx == NULL) {
+		fprintf(stderr, "failed to create context\n");
+		exit(EXIT_FAILURE);
+	}
+	surf = eglCreatePbufferSurface(dpy, conf, pbuf_attribs);
+	if (!surf) {
+		fprintf(stderr, "failed to create pbuffer surface\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (!eglMakeCurrent(dpy, surf, surf, ctx)) {
+		fprintf(stderr, "failed to make context current\n");
+		exit(EXIT_FAILURE);
+	}
+#endif
+
 #else
 	glutInit(&argc, argv);
 	glutInitDisplayMode(GLUT_RGBA /*| GLUT_DEPTH */ | GLUT_DOUBLE);
@@ -238,22 +294,23 @@ init_gl(int argc, char **argv)
 	int window = glutCreateWindow("wimmel");
 	glutDestroyWindow(window);
 #endif
-	glGenFramebuffersEXT(1, &fb);
-	glGenRenderbuffersEXT(1, &rb);
-
-	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
-	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
-
-	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
-				     GL_COLOR_ATTACHMENT0_EXT,
-				     GL_RENDERBUFFER_EXT,
-				     rb);
-	glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,
-				 GL_RGBA,
-				 width, height);
-
-	if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) !=
-	    GL_FRAMEBUFFER_COMPLETE_EXT) {
+
+	glGenFramebuffers(1, &fb);
+	glGenRenderbuffers(1, &rb);
+
+	glBindFramebuffer(GL_FRAMEBUFFER, fb);
+	glBindRenderbuffer(GL_RENDERBUFFER, rb);
+
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER,
+				  GL_COLOR_ATTACHMENT0,
+				  GL_RENDERBUFFER,
+				  rb);
+	glRenderbufferStorage(GL_RENDERBUFFER,
+			      GL_RGBA4,
+			      width, height);
+
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
+	    GL_FRAMEBUFFER_COMPLETE) {
 		fprintf(stderr, "Framebuffer not complete\n");
 		exit(EXIT_FAILURE);
 	}
-- 
cgit