80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
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package shader
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import (
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"errors"
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"strings"
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"github.com/go-gl/gl/v4.6-core/gl"
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)
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type Shader struct {
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program uint32
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uniforms map[string]uint32
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}
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func (s *Shader) Use() {
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gl.UseProgram(s.program)
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}
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func (s *Shader) Delete() {
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gl.DeleteProgram(s.program)
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}
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func compileShader(source string, shaderType uint32) (uint32, error) {
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shader := gl.CreateShader(shaderType)
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csource, free := gl.Strs(source)
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gl.ShaderSource(shader, 1, csource, nil)
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free()
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gl.CompileShader(shader)
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var status int32
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gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
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if status == gl.FALSE {
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var logLength int32
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gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))
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return 0, errors.New(log)
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}
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return shader, nil
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}
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func New(vertexSource string, fragmantSource string) (shader Shader, _ error) {
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shader.uniforms = make(map[string]uint32)
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vertexShader, err := compileShader(vertexSource, gl.VERTEX_SHADER)
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if err != nil {
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return shader, err
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}
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fragmantShader, err := compileShader(fragmantSource, gl.FRAGMENT_SHADER)
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if err != nil {
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return shader, err
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}
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shader.program = gl.CreateProgram()
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gl.AttachShader(shader.program, vertexShader)
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gl.AttachShader(shader.program, fragmantShader)
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gl.LinkProgram(shader.program)
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defer gl.DeleteShader(vertexShader)
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defer gl.DeleteShader(fragmantShader)
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var status int32
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gl.GetProgramiv(shader.program, gl.LINK_STATUS, &status)
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if status == gl.FALSE {
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var logLength int32
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gl.GetProgramiv(shader.program, gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetProgramInfoLog(shader.program, logLength, nil, gl.Str(log))
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return shader, errors.New(log)
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}
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return shader, nil
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}
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