X-Git-Url: https://git.ralfj.de/gltest.git/blobdiff_plain/ce1b46da645fdcac80fc9c71082bb5cb40166576..3e648337c136c8a8715d642857faa9e00a6db180:/glutil_gl2.cpp

diff --git a/glutil_gl2.cpp b/glutil_gl2.cpp
index 666ede9..87d8e0c 100644
--- a/glutil_gl2.cpp
+++ b/glutil_gl2.cpp
@@ -16,13 +16,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#include "glutil.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string>
 #include <sstream>
 
-#include "glutil.h"
-
 // extension functions we use
 typedef GLuint (*GLCREATESHADERPROC) (GLenum type);
 typedef void (*GLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
@@ -78,8 +78,7 @@ static T_proc resolveFunctionPointer(T_glGetProcAddress p_glGetProcAddress, cons
 {
 	T_proc proc = p_glGetProcAddress(name);
 	if (proc == NULL) {
-		fprintf(stderr, "Error resolvung function %s\n", name);
-		exit(1);
+		die("Error resolvung function %s\n", name);
 	}
 	return proc;
 }
@@ -96,8 +95,7 @@ void resolveFunctionPointers(T_glGetProcAddress p_glGetProcAddress)
 	int majorVersion;
 	ssm >> majorVersion;
 	if (majorVersion < 2) {
-		fprintf(stderr, "Need at least GL 2.0 to function properly, but detected version %d\n", majorVersion);
-		exit(1);
+		die("Need at least GL 2.0 to function properly, but detected version %d\n", majorVersion);
 	}
 #endif
 	
@@ -127,35 +125,11 @@ void resolveFunctionPointers(T_glGetProcAddress p_glGetProcAddress)
 	p_glDeleteBuffers = (GLDELETEBUFFERSPROC)resolveFunctionPointer(p_glGetProcAddress, "glDeleteBuffers");
 }
 
-static const char *glErrorToString(GLenum e)
-{
-#define CASE(name) case name: return #name
-	switch (e) {
-		CASE(GL_NO_ERROR);
-		CASE(GL_INVALID_ENUM);
-		CASE(GL_INVALID_VALUE);
-		CASE(GL_INVALID_OPERATION);
-#ifndef CON_GLES2
-		CASE(GL_STACK_OVERFLOW);
-		CASE(GL_STACK_UNDERFLOW);
-#endif
-		CASE(GL_OUT_OF_MEMORY);
-		default: return "<unknown>";
-	}
-#undef CASE
-}
-
-static void checkGlError(const char *what)
-{
-	GLenum e = glGetError();
-	if (e == GL_NO_ERROR) return;
-	fprintf(stderr, "GL error %d (%s): %s\n", e, glErrorToString(e), what);
-	exit(1);
-}
-
 // shaders
 static const char *vertex_shader_source =
 "#version 100 \n\
+precision mediump float;\n\
+precision mediump int;\n\
 attribute vec2 position; \n\
 attribute vec3 color; \n\
 varying vec3 frag_color; \n\
@@ -166,6 +140,8 @@ void main() \n\
 }";
 static const char *fragment_shader_source =
 "#version 100 \n\
+precision mediump float;\n\
+precision mediump int;\n\
 varying vec3 frag_color; \n\
 void main(void) \n\
 { \n\