28 lines
667 B
GLSL
28 lines
667 B
GLSL
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#version 410
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#define SCENE_EXTENT 100.0f
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uniform mat4 matrModel;
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uniform mat4 matrVisu;
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uniform mat4 matrProj;
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uniform sampler2D terrain;
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/////////////////////////////////////////////////////////////////
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layout(location=0) in vec2 Vertex;
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out Attribs {
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vec3 pos;
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} Out;
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// takes a simple 2D vertex on the ground plane, offsets it along y by the land or water offset and projects it on screen
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void main(void)
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{
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vec2 uv = 0.5 * (Vertex + 1);
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float h = 0.001 * (-3.5 + 80 * texture(terrain, uv).r);
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vec3 pos = SCENE_EXTENT * 0.5 * vec3(Vertex.x, h, Vertex.y);
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Out.pos = pos;
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gl_Position = matrProj * matrVisu * matrModel * vec4(pos, 1);
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}
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