98 lines
2.3 KiB
Zig
98 lines
2.3 KiB
Zig
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const sdl = @import("sdl2");
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const gl = @import("zgl");
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const Self = @This();
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window: sdl.Window,
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context: sdl.gl.Context,
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color_loc: u32,
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buffer: gl.Buffer,
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pub fn init() !Self {
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try sdl.init(.{ .video = true, .audio = true, .events = true });
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// Set OpenGL version
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try sdl.gl.setAttribute(.{ .context_major_version = 3 });
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try sdl.gl.setAttribute(.{ .context_minor_version = 3 });
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const window = try sdl.createWindow(
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"USG",
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.{ .centered = {} },
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.{ .centered = {} },
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1280,
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720,
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.{ .opengl = true, .shown = true }
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);
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const ctx = try sdl.gl.createContext(window);
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var color_loc: u32 = undefined;
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const program = gl.Program.create();
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{
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const vs = gl.Shader.create(.vertex);
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defer vs.delete();
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vs.source(1, &.{@embedFile("shaders/vector.vs")});
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vs.compile();
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const fs = gl.Shader.create(.fragment);
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defer fs.delete();
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fs.source(1, &.{@embedFile("shaders/fragment.fs")});
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fs.compile();
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program.attach(vs);
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defer program.detach(vs);
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program.attach(fs);
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defer program.detach(fs);
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program.link();
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color_loc = program.uniformLocation("color").?;
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}
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program.use();
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var vertex_array = gl.VertexArray.gen();
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vertex_array.bind();
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const vertex_buffer = [_]f32{
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-1.0, -1.0, 0.0,
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-1.0, 1.0, 0.0,
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0.0, 1.0, 0.0,
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1.0, 1.0, 0.0,
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0.0, -1.0, 0.0,
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1.0, -1.0, 0.0,
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};
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const buf = gl.Buffer.gen();
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buf.bind(.array_buffer);
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buf.data(f32, &vertex_buffer, .static_draw);
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gl.clearColor(0.91, 0.97, 1.00, 1.00);
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return Self{
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.window = window,
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.context = ctx,
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.color_loc = color_loc,
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.buffer = buf,
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};
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}
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pub fn render(self: Self) void {
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gl.clear(.{ .color = true });
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gl.enableVertexAttribArray(0);
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self.buffer.bind(.array_buffer);
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gl.vertexAttribPointer(0, 3, .float, false, 0, 0);
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gl.uniform4f(self.color_loc, 0.45, 0.21, 0.70, 1);
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gl.drawArrays(.triangles, 0, 3);
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gl.uniform4f(self.color_loc, 0.2, 0.5, 1.0, 1);
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gl.drawArrays(.triangles, 3, 3);
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gl.disableVertexAttribArray(0);
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sdl.gl.swapWindow(self.window);
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}
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pub fn deinit(self: Self) void {
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sdl.quit();
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self.window.destroy();
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sdl.gl.deleteContext(self.context);
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}
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