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Circle! (black and 8 sided)

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This commit is contained in:
nothke 2024-06-12 01:18:22 +02:00
parent 5ecc42ab89
commit 64c94fd1b8
1 changed files with 46 additions and 11 deletions
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57
src/main.zig
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@ -24,25 +24,60 @@ export fn init() void {
std.log.info("Vertex buffers len: {}", .{state.bind.vertex_buffers.len});
var triangleVerts = [_]f32{
// positions colors
0.0, 0.5, 0.5, 1.0, 0.0, 0.0, 1.0,
0.5, -0.5, 0.5, 0.0, 1.0, 0.0, 1.0,
-0.5, -0.5, 0.5, 0.0, 0.0, 1.0, 1.0,
0.7, 0.5, 0.5, 0.0, 1.0, 0.0, 1.0,
};
const vertexCount = 8;
const radius: f32 = 0.4;
const cX: f32 = 0;
const cY: f32 = 0;
const attributesCount = 7;
var triangleVerts = std.mem.zeroes([vertexCount * attributesCount]f32);
const angleDiff: f32 = 1 / @as(f32, @floatFromInt(vertexCount));
for (0..vertexCount) |i| {
const pi: f32 = @floatCast(std.math.pi);
const angle: f32 = @as(f32, @floatFromInt(i)) * angleDiff * pi * 2;
const x = radius * @cos(angle) + cX;
const y = radius * @sin(angle) + cY;
const si = i * attributesCount;
triangleVerts[si + 0] = x;
triangleVerts[si + 1] = y;
triangleVerts[si + 2] = 0.5;
}
// var triangleVerts = [_]f32{
// // positions colors
// 0.0, 0.5, 0.5, 1.0, 0.0, 0.0, 1.0,
// 0.5, -0.5, 0.5, 0.0, 1.0, 0.0, 1.0,
// -0.5, -0.5, 0.5, 0.0, 0.0, 1.0, 1.0,
// 0.7, 0.5, 0.5, 0.0, 1.0, 0.0, 1.0,
// };
state.bind.vertex_buffers[0] = sg.makeBuffer(.{
.data = sg.asRange(&triangleVerts),
});
const indexBuffer = [_]u16{
0, 1, 2,
0, 3, 1,
};
const trisCount = vertexCount - 2;
var indexBuffer: [trisCount * 3]u16 = undefined;
state.indexCount = indexBuffer.len;
// const indexBuffer = [_]u16{
// 0, 1, 2,
// 0, 2, 3,
// };
for (0..trisCount) |tri| {
const triu: u16 = @intCast(tri);
indexBuffer[tri * 3 + 0] = 0;
indexBuffer[tri * 3 + 1] = triu + 1;
indexBuffer[tri * 3 + 2] = triu + 2;
}
state.bind.index_buffer = sg.makeBuffer(.{
.type = .INDEXBUFFER,
.data = sg.asRange(&indexBuffer),