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examples/gkurve: add alpha blending

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-05-22 21:12:35 -07:00
parent ec95bc8103
commit 38091d0d1b
1 changed files with 19 additions and 2 deletions
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21
examples/gkurve/main.zig
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@ -89,8 +89,12 @@ pub fn init(app: *App, engine: *mach.Engine) !void {
const wsize = try engine.core.getWindowSize();
const window_width = @intToFloat(f32, wsize.width);
const window_height = @intToFloat(f32, wsize.height);
// const triangle_scale = 250;
const triangle_scale = 250;
_ = window_width;
_ = window_height;
_ = triangle_scale;
_ = img_uv_data;
_ = white_texture_uv_data;
// try draw.equilateralTriangle(app, .{ window_width / 2, window_height / 2 }, triangle_scale, .{}, img_uv_data);
// try draw.equilateralTriangle(app, .{ window_width / 2, window_height / 2 - triangle_scale }, triangle_scale, .{ .type = .concave }, img_uv_data);
// try draw.equilateralTriangle(app, .{ window_width / 2 - triangle_scale, window_height / 2 - triangle_scale / 2 }, triangle_scale, .{ .type = .convex }, white_texture_uv_data);
@ -107,9 +111,22 @@ pub fn init(app: *App, engine: *mach.Engine) !void {
.code = .{ .wgsl = @embedFile("frag.wgsl") },
});
const blend = gpu.BlendState{
.color = .{
.operation = .add,
.src_factor = .src_alpha,
.dst_factor = .one_minus_src_alpha,
},
.alpha = .{
.operation = .add,
.src_factor = .one,
.dst_factor = .zero,
},
};
const color_target = gpu.ColorTargetState{
.format = engine.gpu_driver.swap_chain_format,
.blend = null,
.blend = &blend,
.write_mask = gpu.ColorWriteMask.all,
};
const fragment = gpu.FragmentState{