112 lines
3.2 KiB
GLSL
112 lines
3.2 KiB
GLSL
#version 450
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#extension GL_EXT_buffer_reference : require
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#include "hex_common.glsl"
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#define PI 3.1415926535897932384626433832795
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const float w = 0.5;
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const float x = 0.75;
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const float z = sqrt(3.0)/2.0;
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const vec4 vertices[] = {
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vec4(0, 0, 0, 1),
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vec4(w*cos(0*PI/3), 0, w*sin(0*PI/3), 1),
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vec4(w*cos(1*PI/3), 0, w*sin(1*PI/3), 1),
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vec4(w*cos(2*PI/3), 0, w*sin(2*PI/3), 1),
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vec4(w*cos(3*PI/3), 0, w*sin(3*PI/3), 1),
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vec4(w*cos(4*PI/3), 0, w*sin(4*PI/3), 1),
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vec4(w*cos(5*PI/3), 0, w*sin(5*PI/3), 1),
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};
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const uint indices[] = {
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0, 2, 1,
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0, 3, 2,
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0, 4, 3,
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0, 5, 4,
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0, 6, 5,
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0, 1, 6,
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};
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const vec4 starts[] = {
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vec4( 0, 0, z, 0),
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vec4(-x, 0, z/2, 0),
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vec4(-x, 0, -z/2, 0),
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vec4( 0, 0, -z, 0),
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vec4( x, 0, -z/2, 0),
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vec4( x, 0, z/2, 0),
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};
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const vec4 direction[] = {
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vec4(-x, 0, -z/2, 0),
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vec4( 0, 0, -z, 0),
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vec4( x, 0, -z/2, 0),
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vec4( x, 0, z/2, 0),
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vec4( 0, 0, z, 0),
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vec4(-x, 0, z/2, 0),
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};
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layout(location=0) out vec4 color;
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vec4 int2color(uint color_int) {
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float r = float((color_int >> 24) & 0xFF)/255.0;
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float g = float((color_int >> 16) & 0xFF)/255.0;
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float b = float((color_int >> 8) & 0xFF)/255.0;
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float a = float((color_int >> 0) & 0xFF)/255.0;
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return vec4(r, g, b, a);
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}
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const uint region_size = 6;
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const uint region_hex_count = 3*region_size*(region_size-1)+1;
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void main() {
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uint region_index = uint(floor(gl_InstanceIndex/region_hex_count));
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uint hex_index = gl_InstanceIndex - (region_index*region_hex_count);
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Region region = pc.context.regions[region_index];
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float q = region.q;
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float r = region.r;
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float z_off = 0;
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if(r != 0) {
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z_off = r/2;
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}
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float x_off = 0;
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if((q+r) != 0) {
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x_off = (q+r)/2;
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}
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vec4 region_offset = vec4(x*(x_off + 2*(r+(-q-r)/2)*(region_size-0.5)), 0, z*(z_off + 2*(-q-r)*(region_size-1.75)), 0);
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uint radius = 0;
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uint ring = 0;
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uint side = 0;
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uint hex = 0;
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if(hex_index != 0) {
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radius = uint(floor(0.5 + sqrt(12*hex_index-3)/6));
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ring = hex_index - (3*radius*radius - 3*radius + 1);
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side = uint(floor(ring/(radius)));
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hex = ring - (radius*side);
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}
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vec4 position = vertices[indices[gl_VertexIndex]] + (starts[side]*radius) + (direction[side]*hex) + region_offset;
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if(gl_VertexIndex % 3 == 0) {
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position.y = (region.hexes[hex_index].heights[0] +
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region.hexes[hex_index].heights[1] +
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region.hexes[hex_index].heights[2] +
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region.hexes[hex_index].heights[3] +
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region.hexes[hex_index].heights[4] +
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region.hexes[hex_index].heights[5])/6;
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color = (int2color(region.hexes[hex_index].colors[0]) +
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int2color(region.hexes[hex_index].colors[1]) +
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int2color(region.hexes[hex_index].colors[2]) +
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int2color(region.hexes[hex_index].colors[3]) +
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int2color(region.hexes[hex_index].colors[4]) +
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int2color(region.hexes[hex_index].colors[5]))/6;
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} else {
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position.y = region.hexes[hex_index].heights[indices[gl_VertexIndex]-1];
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color = int2color(region.hexes[hex_index].colors[indices[gl_VertexIndex]-1]);
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}
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gl_Position = pc.context.proj * pc.context.view * position;
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}
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