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main.go
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main.go
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package main
import (
"bytes"
_ "embed"
"fmt"
"image"
"image/draw"
"image/png"
"io/ioutil"
"os"
"github.com/go-gl/gl/v4.3-core/gl"
"github.com/go-gl/glfw/v3.3/glfw"
)
func main() {
if err := withgl(run); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func withgl(fn func() error) error {
if err := glfw.Init(); err != nil {
return fmt.Errorf("failed to run glfw init: %w", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Visible, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(512, 512, "Image Processing", nil, nil)
if err != nil {
return fmt.Errorf("failed to create window: %w", err)
}
defer window.Destroy()
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
return fmt.Errorf("init gl: %w", err)
}
return fn()
}
func run() error {
fmt.Println("Renderer :", gl.GoStr(gl.GetString(gl.RENDERER)))
fmt.Println("OpenGL :", gl.GoStr(gl.GetString(gl.VERSION)))
fmt.Printf("Work Group Info: %#v\n", getWorkGroupInfo())
shader, err := compileShader(kernelSource)
if err != nil {
return fmt.Errorf("compile shader: %w", err)
}
defer gl.DeleteShader(shader)
program, err := createProgram(shader)
if err != nil {
return fmt.Errorf("create program: %w", err)
}
defer gl.DeleteProgram(program)
var maxTextureSize int32
gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, &maxTextureSize)
fmt.Println("max texture size", maxTextureSize)
inputData, _ := ioutil.ReadFile("input.png")
xm, err := png.Decode(bytes.NewReader(inputData))
if err != nil {
return fmt.Errorf("create program: %w", err)
}
inputImage := convertToRGBA(xm)
size := inputImage.Rect.Size()
imageInput := createInputTexture(0, inputImage)
defer gl.DeleteTextures(1, &imageInput)
imageOutput := createOutputTexture(1, size)
defer gl.DeleteTextures(1, &imageOutput)
gl.UseProgram(program)
gl.DispatchCompute(uint32(size.X), uint32(size.Y), 1)
gl.MemoryBarrier(gl.SHADER_IMAGE_ACCESS_BARRIER_BIT)
m := image.NewRGBA(image.Rect(0, 0, size.X, size.Y))
gl.GetTextureImage(imageOutput, 0, gl.RGBA, gl.UNSIGNED_BYTE, int32(len(m.Pix)), gl.Ptr(m.Pix))
f, err := os.Create("output.png")
if err != nil {
return fmt.Errorf("create file: %w", err)
}
defer f.Close()
err = png.Encode(f, m)
if err != nil {
return fmt.Errorf("encode image: %w", err)
}
return nil
}
type WorkGroupInfo struct {
MaxCount Vec3i
MaxSize Vec3i
Invocations int32
}
type Vec3i struct{ X, Y, Z int32 }
func getWorkGroupInfo() WorkGroupInfo {
var g WorkGroupInfo
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_COUNT, 0, &g.MaxCount.X)
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_COUNT, 1, &g.MaxCount.Y)
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_COUNT, 2, &g.MaxCount.Z)
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_SIZE, 0, &g.MaxSize.X)
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_SIZE, 1, &g.MaxSize.Y)
gl.GetIntegeri_v(gl.MAX_COMPUTE_WORK_GROUP_SIZE, 2, &g.MaxSize.Z)
gl.GetIntegerv(gl.MAX_COMPUTE_WORK_GROUP_INVOCATIONS, &g.Invocations)
return g
}
func convertToRGBA(m image.Image) *image.RGBA {
if n, ok := m.(*image.RGBA); ok {
return n
}
n := image.NewRGBA(m.Bounds())
draw.Draw(n, n.Bounds(), m, image.Point{}, draw.Src)
return n
}
func createInputTexture(unit uint32, m *image.RGBA) uint32 {
var tex uint32
gl.GenTextures(1, &tex)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
size := m.Rect.Size()
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA32F, int32(size.X), int32(size.Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(m.Pix))
gl.BindImageTexture(unit, tex, 0, false, 0, gl.READ_ONLY, gl.RGBA32F)
return tex
}
func createOutputTexture(unit uint32, size image.Point) uint32 {
var tex uint32
gl.GenTextures(1, &tex)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA32F, int32(size.X), int32(size.Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.BindImageTexture(unit, tex, 0, false, 0, gl.WRITE_ONLY, gl.RGBA32F)
return tex
}
func compileShader(source string) (uint32, error) {
shader := gl.CreateShader(gl.COMPUTE_SHADER)
sourceLen := int32(len(source))
sourceStr, free := gl.Strs(source)
gl.ShaderSource(shader, 1, sourceStr, &sourceLen)
free()
gl.CompileShader(shader)
var status int32
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
if status != gl.TRUE {
defer gl.DeleteShader(shader)
var logLength int32
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
log := make([]byte, logLength+1)
gl.GetShaderInfoLog(shader, logLength, nil, &log[0])
return 0, fmt.Errorf("CompileShader %v: %v", source, string(log))
}
return shader, nil
}
func createProgram(shader uint32) (uint32, error) {
program := gl.CreateProgram()
gl.AttachShader(program, shader)
gl.LinkProgram(program)
var status int32
gl.GetProgramiv(program, gl.LINK_STATUS, &status)
if status != gl.TRUE {
defer gl.DeleteProgram(program)
var logLength int32
gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
log := make([]byte, logLength+1)
gl.GetProgramInfoLog(program, logLength, nil, &log[0])
return 0, fmt.Errorf("LinkProgram: %v", string(log))
}
return program, nil
}
//go:embed kernel.comp
var kernelSource string