Merging r5975 through r6036 from trunk to ogl-es branch.

GLES drivers adapted, but only did make compile-tests.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475

media/opengl.vert

@@ -0,0 +1,34 @@
+// Part of the Irrlicht Engine Shader example.
+// Simple GLSL vertex shader
+// Please note that these example shaders don't do anything really useful.
+// They only demonstrate that shaders can be used in Irrlicht.
+
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+uniform vec3 mLightPos;	// actually just camera-pos in this case
+uniform vec4 mLightColor;
+
+void main(void)
+{
+	gl_Position = mWorldViewProj * gl_Vertex;
+	
+	// transform normal somehow (NOTE: for the real vertex normal you would use an inverse-transpose world matrix instead of mInvWorld)
+	vec4 normal = vec4(gl_Normal, 0.0);
+	normal = mInvWorld * normal;
+	normal = normalize(normal);
+	
+	// (NOTE: not sure why transposed world is used instead of world?)
+	vec4 worldpos = gl_Vertex * mTransWorld;
+	
+	vec4 lightVector = worldpos - vec4(mLightPos,1.0);
+	lightVector = normalize(lightVector);
+	
+	float tmp2 = dot(-lightVector, normal);
+	
+	vec4 tmp = mLightColor * tmp2;
+	gl_FrontColor = gl_BackColor = vec4(tmp.x, tmp.y, tmp.z, 0.0);
+	
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+}