90 lines
2.4 KiB
HLSL
90 lines
2.4 KiB
HLSL
#include "shaders/common.hlsl"
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cbuffer constants : register(b0)
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{
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float4x4 G_projection;
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};
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struct vs_input {
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DECL(float4, pos);
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DECL(float, line_thickness);
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DECL(float, line_spacing);
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DECL(float2, offset);
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DECL(float4, bg0_srgb);
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DECL(float4, bg1_srgb);
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DECL(float4, line_srgb);
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DECL(float4, x_srgb);
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DECL(float4, y_srgb);
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};
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struct ps_input {
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DESV(float4, screen_pos, SV_POSITION);
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DECL(float, line_thickness);
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DECL(float, line_spacing);
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DECL(float2, offset);
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DECL(float4, bg0_lin);
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DECL(float4, bg1_lin);
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DECL(float4, line_lin);
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DECL(float4, x_lin);
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DECL(float4, y_lin);
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};
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/* ========================== *
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* Vertex shader
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* ========================== */
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ps_input vs_main(vs_input input)
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{
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ps_input output;
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output.screen_pos = mul(G_projection, float4(input.pos.xy, 0.f, 1.f));
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output.line_thickness = input.line_thickness;
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output.line_spacing = input.line_spacing;
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output.offset = input.offset;
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output.bg0_lin = linear_from_srgb(input.bg0_srgb);
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output.bg1_lin = linear_from_srgb(input.bg1_srgb);
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output.line_lin = linear_from_srgb(input.line_srgb);
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output.x_lin = linear_from_srgb(input.x_srgb);
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output.y_lin = linear_from_srgb(input.y_srgb);
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return output;
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}
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/* ========================== *
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* Pixel shader
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* ========================== */
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float4 ps_main(ps_input input) : SV_TARGET
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{
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float2 grid_pos = input.screen_pos.xy + input.offset;
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float half_thickness = input.line_thickness / 2;
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float spacing = input.line_spacing;
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float4 color = input.bg0_lin;
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float2 v = abs(round(grid_pos / spacing) * spacing - grid_pos);
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float dist = min(v.x, v.y);
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if (grid_pos.y <= half_thickness && grid_pos.y >= -half_thickness) {
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color = input.x_lin;
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} else if (grid_pos.x <= half_thickness && grid_pos.x >= -half_thickness) {
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color = input.y_lin;
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} else if (dist < half_thickness) {
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color = input.line_lin;
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} else {
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bool checker = false;
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uint cell_x = (uint)(abs(grid_pos.x) / spacing) + (grid_pos.x < 0);
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uint cell_y = (uint)(abs(grid_pos.y) / spacing) + (grid_pos.y < 0);
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if (cell_x % 2 == 0) {
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checker = cell_y % 2 == 0;
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} else {
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checker = cell_y % 2 == 1;
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}
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if (checker) {
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color = input.bg1_lin;
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}
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}
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return color;
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}
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