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shaderexp: use one triangle for fullscreen

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praschke 2022-08-22 13:30:14 +00:00 • committed by Stephen Gutekanst
parent c57f0575ea
commit d9f10d25d0
2 changed files with 15 additions and 21 deletions
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2
shaderexp/main.zig
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@ -139,7 +139,7 @@ pub fn update(app: *App, core: *mach.Core) !void {
const pass = encoder.beginRenderPass(&render_pass_info); const pass = encoder.beginRenderPass(&render_pass_info);
pass.setPipeline(app.pipeline); pass.setPipeline(app.pipeline);
pass.setBindGroup(0, app.bind_group, &.{0}); pass.setBindGroup(0, app.bind_group, &.{0});
pass.draw(6, 1, 0, 0); pass.draw(3, 1, 0, 0);
pass.end(); pass.end();
pass.release(); pass.release();

34
shaderexp/vert.wgsl
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@ -1,29 +1,23 @@
struct VertexOut { struct VertexOut {
@builtin(position) position_clip : vec4<f32>, @builtin(position) position_clip : vec4<f32>,
@location(0) frag_uv : vec2<f32>, @location(0) frag_uv : vec2<f32>,
} }
@vertex fn main(@builtin(vertex_index) index : u32) -> VertexOut { @vertex fn main(@builtin(vertex_index) index : u32) -> VertexOut {
var pos = array<vec2<f32>, 6>( var pos = array<vec2<f32>, 3>(
vec2<f32>(-1.0, -1.0), vec2<f32>(-1.0, -1.0),
vec2<f32>( 1.0, -1.0), vec2<f32>( 3.0, -1.0),
vec2<f32>( 1.0, 1.0), vec2<f32>(-1.0, 3.0),
vec2<f32>( 1.0, 1.0),
vec2<f32>(-1.0, 1.0),
vec2<f32>(-1.0, -1.0)
); );
var uv = array<vec2<f32>, 6>( var uv = array<vec2<f32>, 3>(
vec2<f32>(0.0, 0.0), vec2<f32>(0.0, 0.0),
vec2<f32>(1.0, 0.0), vec2<f32>(2.0, 0.0),
vec2<f32>(1.0, 1.0), vec2<f32>(0.0, 2.0),
vec2<f32>(1.0, 1.0),
vec2<f32>(0.0, 1.0),
vec2<f32>(0.0, 0.0)
); );
var output : VertexOut; var output : VertexOut;
output.position_clip = vec4<f32>(pos[index], 0.0, 1.0); output.position_clip = vec4<f32>(pos[index], 0.0, 1.0);
output.frag_uv = uv[index]; output.frag_uv = uv[index];
return output; return output;
} }