Texturing and Shading - Learn OpenGL ES: For Mobile Game and Graphics Development - page 194

Figure 5-4 . Using single texture with an object

sampler2D Uniform Variable

Now, take a look at the shader code for texturing. The vertex-fragment shader pair
in Listing 5-6 demonstrates the basics of how 2D texturing is done in a shader .

Listing 5-6. GL TEXTURE/src/com/apress/android/gltexture/GLES20Render-

er.java

private final String _planeVertexShaderCode =
"attribute vec4 aPosition; \n"
+ "attribute vec2 aCoord; \n"
+ "varying vec2 vCoord; \n"
+ "uniform mat4 uMVP; \n"
+ "void main() { \n"
+ " gl_Position = uMVP * aPosition; \n"
+ " vCoord = aCoord; \n"
+ "} \n";

private final String _planeFragmentShaderCode =
"#ifdef GL_FRAGMENT_PRECISION_HIGH \n"
+ "precision highp float; \n"
+ "#else \n"
+ "precision mediump float; \n"