104 lines
2.7 KiB
Go
Executable file
104 lines
2.7 KiB
Go
Executable file
package canvas
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import (
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"errors"
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"fmt"
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"strings"
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)
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type solidShader struct {
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id uint32
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vertex uint32
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color int32
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}
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func loadSolidShader() (*solidShader, error) {
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var vs, fs, program uint32
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{
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csource, freeFunc := gli.Strs(solidVS + "\x00")
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defer freeFunc()
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vs = gli.CreateShader(gl_VERTEX_SHADER)
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gli.ShaderSource(vs, 1, csource, nil)
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gli.CompileShader(vs)
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var logLength int32
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gli.GetShaderiv(vs, gl_INFO_LOG_LENGTH, &logLength)
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if logLength > 0 {
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shLog := strings.Repeat("\x00", int(logLength+1))
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gli.GetShaderInfoLog(vs, logLength, nil, gli.Str(shLog))
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fmt.Printf("VERTEX_SHADER compilation log:\n\n%s\n", shLog)
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}
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var status int32
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gli.GetShaderiv(vs, gl_COMPILE_STATUS, &status)
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if status != gl_TRUE {
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gli.DeleteShader(vs)
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return nil, errors.New("Error compiling GL_VERTEX_SHADER shader part")
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}
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if glErr := gli.GetError(); glErr != gl_NO_ERROR {
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return nil, errors.New("error compiling shader part, glError: " + fmt.Sprint(glErr))
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}
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}
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{
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csource, freeFunc := gli.Strs(solidFS + "\x00")
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defer freeFunc()
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fs = gli.CreateShader(gl_FRAGMENT_SHADER)
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gli.ShaderSource(fs, 1, csource, nil)
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gli.CompileShader(fs)
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var logLength int32
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gli.GetShaderiv(fs, gl_INFO_LOG_LENGTH, &logLength)
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if logLength > 0 {
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shLog := strings.Repeat("\x00", int(logLength+1))
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gli.GetShaderInfoLog(fs, logLength, nil, gli.Str(shLog))
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fmt.Printf("FRAGMENT_SHADER compilation log:\n\n%s\n", shLog)
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}
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var status int32
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gli.GetShaderiv(fs, gl_COMPILE_STATUS, &status)
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if status != gl_TRUE {
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gli.DeleteShader(fs)
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return nil, errors.New("Error compiling GL_FRAGMENT_SHADER shader part")
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}
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if glErr := gli.GetError(); glErr != gl_NO_ERROR {
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return nil, errors.New("error compiling shader part, glError: " + fmt.Sprint(glErr))
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}
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}
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{
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program = gli.CreateProgram()
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gli.AttachShader(program, vs)
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gli.AttachShader(program, fs)
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gli.LinkProgram(program)
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var logLength int32
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gli.GetProgramiv(program, gl_INFO_LOG_LENGTH, &logLength)
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if logLength > 0 {
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shLog := strings.Repeat("\x00", int(logLength+1))
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gli.GetProgramInfoLog(program, logLength, nil, gli.Str(shLog))
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fmt.Printf("Shader link log:\n\n%s\n", shLog)
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}
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var status int32
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gli.GetProgramiv(program, gl_LINK_STATUS, &status)
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if status != gl_TRUE {
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gli.DeleteShader(vs)
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gli.DeleteShader(fs)
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return nil, errors.New("error linking shader")
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}
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if glErr := gli.GetError(); glErr != gl_NO_ERROR {
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return nil, errors.New("error linking shader, glError: " + fmt.Sprint(glErr))
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}
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}
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result := &solidShader{}
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result.id = program
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result.vertex = uint32(gli.GetAttribLocation(program, gli.Str("vertex\x00")))
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result.color = gli.GetUniformLocation(program, gli.Str("color\x00"))
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return result, nil
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}
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