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const std = @import("std");
const fs = @import("std").fs;
const panic = std.debug.panic;
const c = @import("c.zig");
const debug_gl = @import("debug_gl.zig");
const cfg = @import("config.zig");
const out = @import("output.zig");
const gl = @import("gl.zig");
const ctrl = @import("control.zig");
const c_allocator = @import("std").heap.c_allocator;
var window: *c.GLFWwindow = undefined;
fn errorCallback(err: c_int, description: [*c]const u8) callconv(.C) void {
panic("Error: {}\n", .{description});
}
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
var config = try cfg.Config.parse(&arena.allocator, "config.yaml");
_ = c.glfwSetErrorCallback(errorCallback);
if (c.glfwInit() == c.GL_FALSE) {
panic("GLFW init failure\n", .{});
}
defer c.glfwTerminate();
var monitor_count: c_int = 0;
const monitors = c.glfwGetMonitors(&monitor_count);
for (monitors[0..@intCast(usize, monitor_count)]) |monitor, i| {
std.debug.warn("monitor {}: '{s}'\n", .{ i, @ptrCast([*:0]const u8, c.glfwGetMonitorName(monitor)) });
}
c.glfwWindowHint(c.GLFW_CONTEXT_VERSION_MAJOR, 4);
c.glfwWindowHint(c.GLFW_CONTEXT_VERSION_MINOR, 2);
c.glfwWindowHint(c.GLFW_OPENGL_FORWARD_COMPAT, c.GL_TRUE);
c.glfwWindowHint(c.GLFW_OPENGL_DEBUG_CONTEXT, debug_gl.is_on);
c.glfwWindowHint(c.GLFW_OPENGL_PROFILE, c.GLFW_OPENGL_CORE_PROFILE);
c.glfwWindowHint(c.GLFW_DEPTH_BITS, 0);
c.glfwWindowHint(c.GLFW_STENCIL_BITS, 0);
c.glfwWindowHint(c.GLFW_VISIBLE, c.GLFW_FALSE);
window = c.glfwCreateWindow(config.width, config.height, "glsl-view", null, null) orelse {
panic("unable to create window\n", .{});
};
defer c.glfwDestroyWindow(window);
c.glfwMakeContextCurrent(window);
c.glfwSwapInterval(1);
var constants = try gl.Constants.create(window, &config);
defer constants.destroy();
var outputs = try std.ArrayList(*out.Output).initCapacity(&arena.allocator, config.outputs.len);
defer outputs.deinit();
for (config.outputs) |output_config, i| {
try outputs.append(out.Output.create(&arena.allocator, output_config, &constants));
}
defer for (outputs.toSlice()) |output| {
output.destroy(output);
};
c.glfwMakeContextCurrent(window);
c.glClearColor(0.0, 0.0, 0.0, 1.0);
debug_gl.assertNoError();
debug_gl.init();
const start_time = c.glfwGetTime();
var prev_time = start_time;
constants.normalized_quad.bind(0);
var main_program = try gl.ShaderProgram.create(
\\#version 330 core
\\
\\layout(location = 0) in vec2 position;
\\out vec2 uv;
\\
\\void main() {
\\ uv = position / 2.0 + 0.5;
\\ gl_Position = vec4(position, 0, 1);
\\}
,
\\#version 330 core
\\
\\in vec2 uv;
\\out vec4 color;
\\
\\void main() {
\\ color = vec4(0,0,0,1);
\\}
);
defer main_program.destroy();
var fbo = try gl.FramebufferObject.create(config.width, config.height);
defer fbo.destroy();
const shader_file = try fs.cwd().openFile(config.fragment, .{});
var last_stat = try shader_file.stat();
try reloadShader(&main_program, shader_file, last_stat.size);
var cache = gl.UniformCache.init(std.heap.c_allocator, &main_program);
defer cache.deinit();
const control = try ctrl.ControlServer.init(&arena.allocator, config.osc, &cache);
defer control.destroy();
_ = try cache.get("radius\x00");
while (c.glfwWindowShouldClose(window) == c.GL_FALSE) {
c.glfwMakeContextCurrent(window);
c.glClear(c.GL_COLOR_BUFFER_BIT);
const now_time = c.glfwGetTime();
const elapsed = now_time - prev_time;
prev_time = now_time;
const stat = try shader_file.stat();
if (stat.mtime > last_stat.mtime) {
try reloadShader(&main_program, shader_file, stat.size);
try cache.refresh();
last_stat = stat;
}
if (try cache.get("offset\x00")) |offset| {
offset.value.FLOAT += 0.01;
offset.setShaderValue(main_program);
}
control.update();
fbo.bind();
c.glClear(c.GL_COLOR_BUFFER_BIT);
main_program.bind();
constants.normalized_quad.draw();
fbo.unbind();
for (outputs.toSlice()) |output, i| {
const close = output.update(output, fbo.texture_id);
if (close) {
const removed = outputs.swapRemove(i);
removed.destroy(removed);
break;
}
}
if (outputs.len == 0)
break;
c.glfwPollEvents();
}
}
fn reloadShader(current: *gl.ShaderProgram, frag_file: fs.File, size: u64) !void {
var frag_source = try c_allocator.alloc(u8, @intCast(usize, size));
defer c_allocator.free(frag_source);
try frag_file.seekTo(0);
const length = try frag_file.read(frag_source);
const vert_source =
\\#version 330 core
\\
\\layout(location = 0) in vec2 position;
\\out vec2 uv;
\\
\\void main() {
\\ uv = position / 2.0 + 0.5;
\\ gl_Position = vec4(position, 0, 1);
\\}
;
if (gl.ShaderProgram.create(vert_source, frag_source[0..length])) |new_program| {
current.destroy();
current.* = new_program;
} else |err| {
std.debug.warn("Error while reloading shader:{}\n", .{err});
}
}
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