Any sage advice for me available? I am trying to get a phone shader up and working, although I am running into some sad blocks in OpenGL ES 2.0.
I have used this article as a starting point:
https://www.opengl.org/sdk/docs/tutorials/ClockworkCoders/lighting.php
Do I just need MORE polygons, or am I fundamentally misunderstanding something? Please help me, very sorry.
Vertex Shader:
uniform mat4 ProjectionMatrix;
uniform mat4 ModelViewMatrix;
uniform mat4 NormalMatrix;
attribute vec3 Positions;
attribute vec3 Normals;
attribute vec3 TextureCoords;
varying vec2 TextureCoordsOut;
varying vec3 N;
varying vec3 v;
void main(void) {
v = vec3(NormalMatrix * vec4(Positions[0], Positions[1], Positions[2], 1.0));
N = normalize(vec3(NormalMatrix * vec4(Normals[0], Normals[1], Normals[2], 1.0)));
gl_Position = ProjectionMatrix * ModelViewMatrix * vec4(Positions[0], Positions[1], Positions[2], 1.0);
TextureCoordsOut = vec2(TextureCoords[0], TextureCoords[1]);
}
Fragment Shader:
varying mediump vec3 N;
varying mediump vec3 v;
uniform lowp vec4 ModulateColor;
varying lowp vec2 TextureCoordsOut;
uniform sampler2D Texture;
//r, g, b, [ambient intensity]
uniform lowp vec4 Ambient;
//dirX, dirY, dirZ, [diffuse intensity]
uniform lowp vec4 Diffuse;
//Shininess, Specular Intensity
uniform lowp vec2 Specular;
void main (void) {
mediump vec3 Direction = vec3(-Diffuse[0], -Diffuse[1], -Diffuse[2]);
//highp vec3 SpotlightPosition = vec3(Specular[0], Specular[1], Specular[2]);
//highp vec3 L = normalize(SpotlightPosition - v);
mediump vec3 L = Direction;//normalize(SpotlightPosition - v);
mediump vec3 E = normalize(v); // we are in Eye Coordinates, so EyePos is (0,0,0)
mediump vec3 R = normalize(-reflect(L,N));
//calculate Diffuse Term:
lowp float Idiff = max(dot(N,L), 0.0) * Diffuse[3];
Idiff = clamp(Idiff, 0.0, 1.0);
// calculate Specular Term:
lowp float Ispec = pow(max(dot(R, E), 0.0), Specular[0]) * Specular[1];
Ispec = clamp(Ispec, 0.0, 100.0);
lowp float Ilight = Ambient[3] + Idiff + Ispec
gl_FragColor = vec4(Ilight, Ilight, Ilight, 1.0);
}
