1 #version 410 compatibility
5 uniform sampler2D field_tex;
6 uniform float field_scale;
10 vec4 v1 = mix(gl_in[0].gl_Position, gl_in[1].gl_Position, gl_TessCoord.x);
11 vec4 v2 = mix(gl_in[3].gl_Position, gl_in[2].gl_Position, gl_TessCoord.x);
12 vec4 pos = mix(v1, v2, gl_TessCoord.y);
14 vec4 top = mix(gl_in[0].gl_TexCoord[0], gl_in[1].gl_TexCoord[0], gl_TessCoord.x);
15 vec4 bot = mix(gl_in[3].gl_TexCoord[0], gl_in[2].gl_TexCoord[0], gl_TessCoord.x);
16 vec4 uv = mix(top, bot, gl_TessCoord.y);
18 float field = -texture2D(field_tex, uv.st).x;
19 pos.y = field * field_scale;
21 gl_Position = gl_ModelViewProjectionMatrix * pos;