hlgl/main.go

package main

import (
	"runtime"

	"github.com/go-gl/gl/v4.1-core/gl"
	"github.com/go-gl/glfw/v3.3/glfw"
	"github.com/go-gl/mathgl/mgl32"
)

const (
	start_width  = 1920
	start_height = 1080
)

func main() {
	runtime.LockOSThread()

	if err := glfw.Init(); err != nil {
	}
	defer glfw.Terminate()
	glfw.WindowHint(glfw.ContextVersionMajor, 4)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)

	window, err := glfw.CreateWindow(start_width, start_height, "Learning OpenGL", nil, nil)
	if err != nil {
		panic(err)
	}

	window.MakeContextCurrent()
	if err := gl.Init(); err != nil {
		panic(err)
	}

	projection := CreateOrthographicProjection(start_width, start_height)
	InitHLGL(projection)

	gl.ClearColor(0.2, 0.3, 0.3, 1.0)

	for !window.ShouldClose() {
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

		// DrawRectangleWH(100, 100, 700, 150, HLColorRGBA{255, 0, 0, 255})
		// DrawRectangleWH(400, 200, 300, 300, HLColorRGBA{0, 255, 0, 255})
		DrawRoundedRectangle(200, 500, 200, 200, 10, HLColorRGBA{0, 0, 255, 255})

		window.SwapBuffers()
		glfw.WaitEvents()
	}
	window.Destroy()
	return
}

func CreateOrthographicProjection(width, height int) mgl32.Mat4 {
	return mgl32.Ortho(0, float32(width), 0, float32(height), -1, 1)
}