110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
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package main
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import (
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"fmt"
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"runtime"
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"github.com/go-gl/gl/v4.1-core/gl"
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"github.com/go-gl/glfw/v3.3/glfw"
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"github.com/go-gl/mathgl/mgl32"
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)
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const (
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start_width = 1920
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start_height = 1080
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)
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var vertices = []float32{
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960, 540, 0.0,
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1460, 540, 0.0,
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960, 1040, 0.0,
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}
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const vertexShaderSource = `
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#version 410 core
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layout(location = 0) in vec3 position;
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uniform mat4 u_Projection;
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void main() {
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gl_Position = u_Projection * vec4(position, 1.0);
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}
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`
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const fragmentShaderSource = `
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#version 410 core
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out vec4 color;
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uniform vec4 u_Color;
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void main() {
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color = u_Color;
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}
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`
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func main() {
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runtime.LockOSThread()
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if err := glfw.Init(); err != nil {
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}
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defer glfw.Terminate()
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glfw.WindowHint(glfw.Decorated, glfw.True)
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glfw.WindowHint(glfw.TransparentFramebuffer, glfw.False)
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glfw.WindowHint(glfw.Resizable, glfw.False)
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glfw.WindowHint(glfw.ContextVersionMajor, 4)
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glfw.WindowHint(glfw.ContextVersionMinor, 1)
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glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
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// glfw.WindowHint(glfw.TransparentFramebuffer, glfw.True)
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window, err := glfw.CreateWindow(start_width, start_height, "Learning OpenGL", nil, nil)
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if err != nil {
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}
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defer window.Destroy()
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window.MakeContextCurrent()
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if err := gl.Init(); err != nil {
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glfw.Terminate()
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}
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gl.Viewport(0, 0, int32(start_width), int32(start_height))
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window.SetMouseButtonCallback(func(w *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
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println("Mouse Button Event!")
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})
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window.SetSizeCallback(func(w *glfw.Window, width int, height int) {
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fmt.Printf("Window resize event - Width: %d, Height: %d\n", width, height)
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})
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shader, _ := NewShader(vertexShaderSource, fragmentShaderSource)
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projection := CreateOrthographicProjection(start_width, start_height)
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vao := NewVertexArray()
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vbo := NewVertexBuffer(vertices)
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vao.AddBuffer(vbo, []int32{3})
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gl.ClearColor(0.2, 0.3, 0.3, 1.0)
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for !window.ShouldClose() {
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shader.Use()
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shader.SetUniformM("u_Projection", projection)
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color := HLColorRGBA{255, 0, 0, 255}
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shader.SetUniform4f("u_Color", float32(color.R)/255.0, float32(color.G)/255.0, float32(color.B)/255.0, float32(color.A)/255.0)
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gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
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// Handled by the Draw Rectangle function
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// vao.Bind()
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// gl.DrawArrays(gl.TRIANGLES, 0, 3)
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DrawRectangleWH(0, 0, 100, 200, HLColorRGBA{255, 0, 0, 255})
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window.SwapBuffers()
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glfw.PollEvents()
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}
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}
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func CreateOrthographicProjection(width, height int) mgl32.Mat4 {
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return mgl32.Ortho(0, float32(width), 0, float32(height), -1, 1)
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}
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