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|
const std = @import("std");
const c = @import("c.zig");
const build_config = @import("build_config");
const cfg = @import("config.zig");
const gl = @import("gl.zig");
pub const Output = struct {
update_fn: *const fn (output: *Output, texture_id: c.GLuint) bool,
destroy_fn: *const fn (output: *Output, allocator: std.mem.Allocator) void,
pub fn create(
allocator: std.mem.Allocator,
config: *const cfg.OutputConfig,
constants: *gl.Constants,
) !*Output {
switch (config.*) {
inline else => |*con| {
const ConfigType = @TypeOf(con.*);
if (ConfigType == void) return error.supportDisabled;
return con.create(allocator, constants);
},
}
}
pub fn update(self: *Output, texture_id: c.GLuint) bool {
return self.update_fn(self, texture_id);
}
pub fn destroy(self: *Output, allocator: std.mem.Allocator) void {
return self.destroy_fn(self, allocator);
}
};
pub const WindowOutput = struct {
pub const Config = struct {
const FilterMode = enum(c.GLuint) {
nearest = c.GL_NEAREST,
linear = c.GL_LINEAR,
};
width: i32,
height: i32,
filter: FilterMode,
monitor: []const u8,
fullscreen: bool,
pub const default: Config = .{
.width = 800,
.height = 600,
.filter = .linear,
.monitor = "",
.fullscreen = false,
};
pub fn create(
config: *const Config,
allocator: std.mem.Allocator,
constants: *gl.Constants,
) *Output {
const self = allocator.create(WindowOutput) catch unreachable;
c.glfwDefaultWindowHints();
c.glfwWindowHint(c.GLFW_FOCUSED, c.GLFW_FALSE);
c.glfwWindowHint(c.GLFW_FLOATING, c.GLFW_TRUE);
c.glfwWindowHint(c.GLFW_TRANSPARENT_FRAMEBUFFER, c.GL_TRUE);
self.* = .{
.constants = constants,
.output = .{
.update_fn = update,
.destroy_fn = destroy,
},
.window = c.glfwCreateWindow(
config.width,
config.height,
"glsl-view output",
null,
constants.main_window,
) orelse {
std.debug.panic("unable to create output window\n", .{});
},
};
c.glfwSetWindowUserPointer(self.window, @as(*anyopaque, @ptrCast(self)));
_ = c.glfwSetKeyCallback(self.window, keyCallback);
_ = c.glfwSetFramebufferSizeCallback(self.window, sizeCallback);
c.glfwMakeContextCurrent(self.window);
constants.normalized_quad.bind(0);
return &self.output;
}
};
output: Output,
window: *c.GLFWwindow,
constants: *gl.Constants,
resized: bool = false,
fn update(output: *Output, texture_id: c.GLuint) bool {
const self: *WindowOutput = @fieldParentPtr("output", output);
if (c.glfwWindowShouldClose(self.window) == c.GL_TRUE)
return true;
c.glfwMakeContextCurrent(self.window);
c.glClearColor(0, 0, 0, 1);
c.glClear(c.GL_COLOR_BUFFER_BIT);
c.glfwWindowHint(c.GLFW_RESIZABLE, c.GLFW_FALSE);
c.glfwWindowHint(c.GLFW_DECORATED, c.GLFW_FALSE);
if (self.resized) {
var width: c_int = undefined;
var height: c_int = undefined;
var scaled_width: c_int = undefined;
var scaled_height: c_int = undefined;
c.glfwGetFramebufferSize(self.window, &width, &height);
const window_aspect = @as(f32, @floatFromInt(width)) / @as(f32, @floatFromInt(height));
if (window_aspect >= self.constants.aspect) {
scaled_height = height;
scaled_width = @as(c_int, @intFromFloat(@as(f32, @floatFromInt(height)) * self.constants.aspect));
} else {
scaled_width = width;
scaled_height = @as(c_int, @intFromFloat(@as(f32, @floatFromInt(width)) / self.constants.aspect));
}
c.glViewport(
@divFloor(width - scaled_width, 2),
@divFloor(height - scaled_height, 2),
scaled_width,
scaled_height,
);
}
c.glBindTexture(c.GL_TEXTURE_2D, texture_id);
c.glDrawArrays(c.GL_TRIANGLE_STRIP, 0, 4);
self.constants.texture_shader.bind();
self.constants.normalized_quad.draw();
c.glfwSwapBuffers(self.window);
return false;
}
fn destroy(output: *Output, allocator: std.mem.Allocator) void {
const self: *WindowOutput = @fieldParentPtr("output", output);
c.glfwDestroyWindow(self.window);
allocator.destroy(self);
}
fn keyCallback(
win: ?*c.GLFWwindow,
key: c_int,
scancode: c_int,
action: c_int,
mods: c_int,
) callconv(.C) void {
if (action != c.GLFW_PRESS) return;
const userptr = c.glfwGetWindowUserPointer(win).?;
const self = @as(*WindowOutput, @ptrCast(@alignCast(userptr)));
_ = self;
_ = scancode;
_ = mods;
switch (key) {
// c.GLFW_KEY_F => // toggle fullscreen
// c.GLFW_KEY_LEFT => // cycle through monitors
// c.GLFW_KEY_RIGHT => // cycle through monitors
else => {},
}
}
fn sizeCallback(win: ?*c.GLFWwindow, width: c_int, height: c_int) callconv(.C) void {
const userptr = c.glfwGetWindowUserPointer(win).?;
const self = @as(*WindowOutput, @ptrCast(@alignCast(userptr)));
self.resized = true;
_ = width;
_ = height;
}
};
|
