June 2013
Intermediate to advanced
346 pages
8h 42m
English
Content preview from OpenGL ES 2 for Android
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Drawing the Height Map
Now that we have the height map loaded in, let’s get it drawn to the screen. Create a new file called heightmap_vertex_shader.glsl in your /res/raw folder, and add the following code:
| Heightmap/res/raw/heightmap_vertex_shader.glsl | |
| | uniform mat4 u_Matrix; |
| | attribute vec3 a_Position; |
| | varying vec3 v_Color; |
| | |
| | void main() |
| | { |
| | v_Color = mix(vec3(0.180, 0.467, 0.153), // A dark green |
| | vec3(0.660, 0.670, 0.680), // A stony gray |
| | a_Position.y); |
| | |
| | gl_Position = u_Matrix * vec4(a_Position, 1.0); |
| | } |
This vertex shader uses a new shader function, mix, to smoothly interpolate between two different colors. We set up our height map so that the height is between 0 and 1, and we use this height as the ratio between the two colors. ...
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