tesselation

[ld42_outofspace] / sdr / field.te.glsl

diff --git a/sdr/field.te.glsl b/sdr/field.te.glsl
index cb01515..eaf485d 100644 (file)
--- a/sdr/field.te.glsl
+++ b/sdr/field.te.glsl
@@ -2,21 +2,22 @@
 
 layout(quads, ccw) in;
 
+uniform sampler2D field_tex;
+uniform float field_scale;
+
 void main()
 {
        vec4 v1 = mix(gl_in[0].gl_Position, gl_in[1].gl_Position, gl_TessCoord.x);
        vec4 v2 = mix(gl_in[3].gl_Position, gl_in[2].gl_Position, gl_TessCoord.x);
        vec4 pos = mix(v1, v2, gl_TessCoord.y);
 
-       vec4 top0 = mix(gl_in[0].gl_TexCoord[0], gl_in[1].gl_TexCoord[0], gl_TessCoord.x);
-       vec4 bot0 = mix(gl_in[3].gl_TexCoord[0], gl_in[2].gl_TexCoord[0], gl_TessCoord.x);
-       vec4 res0 = mix(top0, bot0, gl_TessCoord.y);
+       vec4 top = mix(gl_in[0].gl_TexCoord[0], gl_in[1].gl_TexCoord[0], gl_TessCoord.x);
+       vec4 bot = mix(gl_in[3].gl_TexCoord[0], gl_in[2].gl_TexCoord[0], gl_TessCoord.x);
+       vec4 uv = mix(top, bot, gl_TessCoord.y);
 
-       vec4 top1 = mix(gl_in[0].gl_TexCoord[1], gl_in[1].gl_TexCoord[1], gl_TessCoord.x);
-       vec4 bot1 = mix(gl_in[3].gl_TexCoord[1], gl_in[2].gl_TexCoord[1], gl_TessCoord.x);
-       vec4 res1 = mix(top1, bot1, gl_TessCoord.y);
+       float field = -texture2D(field_tex, uv.st).x;
+       pos.y = field * field_scale;
 
        gl_Position = gl_ModelViewProjectionMatrix * pos;
-       gl_TexCoord[0] = res0;
-       gl_TexCoord[1] = res1;
+       gl_TexCoord[0] = uv;
 }