diff --git a/src/frame.c b/src/frame.c
index 6a60296..fa16959 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -6,6 +6,8 @@
 #include <stdio.h>
 #include <assert.h>
 
+#define USE_ES_SHADERS 0
+
 static const GLfloat textureVertices[] =
 {
 	0.0f, 1.0f,
@@ -110,7 +112,7 @@ bool lvrcInitFrameResources(struct lvrcInstance * instance)
 	//float warp_scale = 0.305f; // test
 	float warp_adj = 1.0f;
 
-#if 0
+#if USE_ES_SHADERS
 	const char* vertex;
 	ohmd_gets(OHMD_GLSL_ES_DISTORTION_VERT_SRC, &vertex);
 	const char* fragment;
@@ -172,9 +174,11 @@ static void prepare(GLuint texture)
 
 static void draw()
 {
+#if USE_ES_SHADERS
 	glVertexAttribPointer(glGetAttribLocation(shader, "coords"), 2, GL_FLOAT, 0, 0, textureVertices);
 	glEnableVertexAttribArray(glGetAttribLocation(shader, "coords"));
 	assert(GL_NO_ERROR == glGetError());
+#endif // USE_ES_SHADERS
 
 	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 	assert(GL_NO_ERROR == glGetError());