53 lines
2.1 KiB
HLSL
53 lines
2.1 KiB
HLSL
#include "include/base_vs_types.hlsl"
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vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, float2 subsample_offset, int rotate_texture_steps)
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{
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vertex_t output;
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float2 tex_coord;
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if (vertex_id == 0) {
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output.viewpoint_pos = float4(-1, -1, 0, 1);
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tex_coord = float2(0, 1);
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}
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else if (vertex_id == 1) {
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output.viewpoint_pos = float4(-1, 3, 0, 1);
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tex_coord = float2(0, -1);
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}
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else {
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output.viewpoint_pos = float4(3, -1, 0, 1);
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tex_coord = float2(2, 1);
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}
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if (rotate_texture_steps != 0) {
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float rotation_radians = radians(90 * rotate_texture_steps);
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float2x2 rotation_matrix = { cos(rotation_radians), -sin(rotation_radians),
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sin(rotation_radians), cos(rotation_radians) };
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float2 rotation_center = { 0.5, 0.5 };
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tex_coord = round(rotation_center + mul(rotation_matrix, tex_coord - rotation_center));
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if (rotate_texture_steps % 2) {
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subsample_offset.xy = subsample_offset.yx;
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}
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}
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#if defined(LEFT_SUBSAMPLING)
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output.tex_right_left_center = float3(tex_coord.x, tex_coord.x - subsample_offset.x, tex_coord.y);
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#elif defined(LEFT_SUBSAMPLING_SCALE)
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float2 halfsample_offset = subsample_offset / 2;
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float3 right_center_left = float3(tex_coord.x + halfsample_offset.x,
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tex_coord.x - halfsample_offset.x,
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tex_coord.x - 3 * halfsample_offset.x);
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float2 top_bottom = float2(tex_coord.y - halfsample_offset.y,
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tex_coord.y + halfsample_offset.y);
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output.tex_right_center_left_top = float4(right_center_left, top_bottom.x);
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output.tex_right_center_left_bottom = float4(right_center_left, top_bottom.y);
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#elif defined(TOPLEFT_SUBSAMPLING)
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output.tex_right_left_top = float3(tex_coord.x, tex_coord.x - subsample_offset.x, tex_coord.y - subsample_offset.y);
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output.tex_right_left_bottom = float3(tex_coord.x, tex_coord.x - subsample_offset.x, tex_coord.y);
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#else
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output.tex_coord = tex_coord;
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#endif
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return output;
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}
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