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)))
}
}
}
}
func newGL32Shader(name, vertexCode, fragmentCode string) (*gl32Shader, error) {
vertexShader, err := compileShader(vertexCode, gl.VERTEX_SHADER)
if err != nil {
return nil, err
}
fragmentShader, err := compileShader(fragmentCode, gl.FRAGMENT_SHADER)
if err != nil {
return nil, err
}
shader := &gl32Shader{name, gl.CreateProgram(), nil}
gl.AttachShader(shader.program, vertexShader)
gl.AttachShader(shader.program, fragmentShader)
gl.BindAttribLocation(shader.program, ATTRIB_POSITION, gl.GLString("position"))
gl.BindAttribLocation(shader.program, ATTRIB_NORMAL, gl.GLString("normal"))
gl.BindAttribLocation(shader.program, ATTRIB_UV0, gl.GLString("uv0"))
gl.BindAttribLocation(shader.program, ATTRIB_UV1, gl.GLString("uv1"))
gl.BindAttribLocation(shader.program, ATTRIB_UV2, gl.GLString("uv2"))
gl.BindAttribLocation(shader.program, ATTRIB_UV3, gl.GLString("uv3"))
gl.BindAttribLocation(shader.program, ATTRIB_COLOR, gl.GLString("color"))
gl.LinkProgram(shader.program)
var status gl.Int
gl.GetProgramiv(shader.program, gl.LINK_STATUS, &status)
if status != 1 {
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShader)
gl.DeleteProgram(shader.program)
return nil, errors.New(fmt.Sprintf("Could not link shader program '%s'", name))
}
shader.buildUniformList()
return shader, nil
}