func compileShader(code string, shaderType gl.Enum) (gl.Uint, error) {
shader := gl.CreateShader(shaderType)
glCode := gl.GLString(code)
defer gl.GLStringFree(glCode)
gl.ShaderSource(shader, 1, &glCode, nil)
gl.CompileShader(shader)
var status gl.Int
gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
if status == 0 {
var logLength gl.Int
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
msg := gl.GLStringAlloc(gl.Sizei(logLength))
defer gl.GLStringFree(msg)
gl.GetShaderInfoLog(shader, gl.Sizei(logLength), nil, msg)
gl.DeleteShader(shader)
return 0, errors.New(gl.GoString(msg))
}
return shader, nil
}
func (s *gl32Shader) buildUniformList() {
s.uniforms = make(Parameters, 4)
s.PreRender(nil)
var uniformCount gl.Int
gl.GetProgramiv(s.program, gl.ACTIVE_UNIFORMS, &uniformCount)
uniformName := gl.GLStringAlloc(128)
defer gl.GLStringFree(uniformName)
textureUnit := 0
for i := 0; i < int(uniformCount); i++ {
var uniformType gl.Enum
var uniformSize gl.Int
var nameLength gl.Sizei
gl.GetActiveUniform(s.program, gl.Uint(i), 128, &nameLength, &uniformSize, &uniformType, uniformName)
// Ignore build in uniforms
if !strings.HasPrefix(gl.GoString(uniformName), "gl_") {
location := gl.GetUniformLocation(s.program, uniformName)
if uniformType == gl.SAMPLER_2D {
gl.Uniform1i(location, gl.Int(textureUnit))
textureUnit++
}
if validUniformTypes[uniformType] {
s.uniforms = append(s.uniforms, newGL32Uniform(location, glToUniform[uniformType], gl.GoStringN(uniformName, nameLength)))
}
}
}
}