/
triangle.go
61 lines (50 loc) · 1.14 KB
/
triangle.go
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// gogl project main.go
package main
import (
"fmt"
"github.com/go-gl/gl"
glfw "github.com/go-gl/glfw3"
)
func errorCallback(err glfw.ErrorCode, desc string) {
fmt.Printf("%v: %v\n", err, desc)
}
func render(window *glfw.Window) {
w, h := window.GetFramebufferSize()
ratio := float64(w) / float64(h)
gl.Viewport(0, 0, w, h)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(-ratio, ratio, -1, 1, 1, -1)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.Rotatef(float32(glfw.GetTime())*50, 0, 0, 1)
gl.Begin(gl.TRIANGLES)
gl.Color3f(1, 0, 0)
gl.Vertex3f(-0.6, -0.4, 0)
gl.Color3f(0, 1, 0)
gl.Vertex3f(0.6, -0.4, 0)
gl.Color3f(0, 0, 1)
gl.Vertex3f(0, 0.6, 0)
gl.End()
}
func main() {
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
window, err := glfw.CreateWindow(640, 480, "Testing", nil, nil)
if err != nil {
panic(err)
}
defer window.Destroy()
window.MakeContextCurrent()
for !window.ShouldClose() {
//Do OpenGL stuff
render(window)
window.SwapBuffers()
glfw.PollEvents()
}
}