mirror of https://github.com/liamg/aminal.git
71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
// Copyright 2012 The go-gl Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package v41
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import (
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"errors"
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"fmt"
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"github.com/go-gl/gl/v4.1-core/gl"
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"strings"
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)
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func NewProgram(vertexShaderSource, fragmentShaderSource string) (uint32, error) {
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vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
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if err != nil {
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return 0, err
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}
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fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
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if err != nil {
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return 0, err
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}
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program := gl.CreateProgram()
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gl.AttachShader(program, vertexShader)
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gl.AttachShader(program, fragmentShader)
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gl.LinkProgram(program)
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var status int32
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gl.GetProgramiv(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(program, gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
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gl.DeleteProgram(program)
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gl.DeleteShader(vertexShader)
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gl.DeleteShader(fragmentShader)
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return 0, errors.New(fmt.Sprintf("failed to link program: %v", log))
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}
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gl.DetachShader(program, vertexShader)
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gl.DetachShader(program, fragmentShader)
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gl.DeleteShader(vertexShader)
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gl.DeleteShader(fragmentShader)
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return program, nil
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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 := gl.Str(source)
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gl.ShaderSource(shader, 1, &csource, nil)
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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, fmt.Errorf("failed to compile %v: %v", source, log)
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}
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return shader, nil
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}
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