X-Git-Url: https://git.ralfj.de/gltest.git/blobdiff_plain/92d3b1692f11658cad027cd597019eabd65faf89..b4dc0596570275aa9def5ff63af951beb8473d58:/eglbackend.cpp

diff --git a/eglbackend.cpp b/eglbackend.cpp
index 04165c7..0d5e5e6 100644
--- a/eglbackend.cpp
+++ b/eglbackend.cpp
@@ -24,6 +24,10 @@
 
 #include <EGL/eglext.h>
 
+#if !defined(CON_GL1) && !defined(CON_GLES2)
+#error "Valid GL contexts for EGL are: GL1, GLES2"
+#endif
+
 static const char *eglErrorToString(EGLint e)
 {
 #define CASE(name) case name: return #name
@@ -49,13 +53,21 @@ static void exitEglError(const char *what)
 	exit(1);
 }
 
-/* attributes for a double buffered visual in RGBA format with at least
-* 4 bits per color */
+static const EGLint context_attribs[] = {
+#ifdef CON_GLES2
+	EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+	EGL_NONE
+};
 static const EGLint config_attribs[] = {
 	EGL_RED_SIZE,             4,
 	EGL_GREEN_SIZE,           4,
 	EGL_BLUE_SIZE,            4,
+#ifdef CON_GLES2
+	EGL_RENDERABLE_TYPE,      EGL_OPENGL_ES2_BIT,
+#else
 	EGL_RENDERABLE_TYPE,      EGL_OPENGL_BIT,
+#endif
 	EGL_NONE,
 };
 
@@ -65,17 +77,31 @@ VisualID EGLBackend::initialize(Display *xDisplay)
 		// get connection and bind API
 		EGLint eglMajor, eglMinor;
 		display = eglGetDisplay(xDisplay);
-		if (display == EGL_NO_DISPLAY)                         
+		if (display == EGL_NO_DISPLAY)
 			exitEglError("Failed to get EGL display");
-		if (eglInitialize(display, &eglMajor, &eglMinor) == EGL_FALSE)                   
+		if (eglInitialize(display, &eglMajor, &eglMinor) == EGL_FALSE)
 			exitEglError("Failed to initialize EGL");
 		printf("Using EGL version %d.%d\n", eglMajor, eglMinor);
-		eglBindAPI(EGL_OPENGL_API);
+		if (eglMajor == 1 && eglMinor < 3) {
+			fprintf(stderr, "Need at least EGL 1.3 to function properly\n");
+			exit(1);
+		}
+#ifdef CON_GLES2
+		if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE)
+#else
+		if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE)
+#endif
+			exitEglError("Failed to bind API");
 		// get an appropriate config
 		EGLConfig configs[1];
 		EGLint count;
-		if (eglChooseConfig(display, config_attribs, configs, 1, &count) == EGL_FALSE || count == 0)                            
+		if (eglChooseConfig(display, config_attribs, configs, 1, &count) == EGL_FALSE){
 			exitEglError("Failed to choose config");
+		}
+		if (count == 0) {
+			fprintf(stderr, "Found no matching EGL configuration\n");
+			exit(1);
+		}
 		config = configs[0];
 	}
 	// return visual ID
@@ -88,8 +114,8 @@ void EGLBackend::createContext(Window window)
 {
 	assert(display != EGL_NO_DISPLAY && context == EGL_NO_CONTEXT);
 	surface = eglCreateWindowSurface(display, config, window, NULL);
-	/* create an EGL context and use it with the surface */                                    
-	context = eglCreateContext(display, config, EGL_NO_CONTEXT, NULL);
+	// create an EGL context and use it with the surface
+	context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attribs);
 	if (context == EGL_NO_CONTEXT)
 		exitEglError("Failed to create context");
 	if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE)