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examples/gkurve: use orthographic projection + pixel units

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-05-14 16:23:15 -07:00 • committed by Stephen Gutekanst
parent af608151e9
commit 1562232871
1 changed files with 13 additions and 6 deletions
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19
examples/gkurve/main.zig
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@ -16,9 +16,9 @@ pub const Vertex = struct {
};
// Simple triangle
pub const vertices = [_]Vertex{
.{ .pos = .{ 0, 0.5, 0, 1 }, .uv = .{ 0.5, 1 }, .bary = .{ 0, 0, 1 } },
.{ .pos = .{ -0.5, -0.5, 0, 1 }, .uv = .{ 0, 0 }, .bary = .{ 1, 0, 0 } },
.{ .pos = .{ 0.5, -0.5, 0, 1 }, .uv = .{ 1, 0 }, .bary = .{ 0, 1, 0 } },
.{ .pos = .{ 0, 250, 0, 1 }, .uv = .{ 0.5, 1 }, .bary = .{ 0, 0, 1 } },
.{ .pos = .{ -250, -250, 0, 1 }, .uv = .{ 0, 0 }, .bary = .{ 1, 0, 0 } },
.{ .pos = .{ 250, -250, 0, 1 }, .uv = .{ 1, 0 }, .bary = .{ 0, 1, 0 } },
};
// TODO: Need to ask Ayush about this, ideally we have a square window in this example because it
@ -214,12 +214,19 @@ pub fn update(app: *App, engine: *mach.Engine) !bool {
};
{
const proj = zm.orthographicRh(
@intToFloat(f32, engine.gpu_driver.current_desc.width),
@intToFloat(f32, engine.gpu_driver.current_desc.height),
-100,
100,
);
// TODO:
// Use better positioning system
const ubos = [_]VertexUniform{
.{ .mat = zm.translation(0.5, 0.5, 0) },
.{ .mat = zm.translation(-0.5, 0, 0) },
.{ .mat = zm.translation(0.5, -0.5, 0) },
.{ .mat = zm.mul(zm.translation(250, 250, 0), proj) },
.{ .mat = zm.mul(zm.translation(-250, 0, 0), proj) },
.{ .mat = zm.mul(zm.translation(250, -250, 0), proj) },
};
encoder.writeBuffer(app.vertex_uniform_buffer, 0, VertexUniform, &ubos);
}