// Implements Renderer interface.
func (gc *opengl) BindShader(sh *data.Shader) (pref uint32, err error) {
pref = gl.CreateProgram()
// FUTURE: get rid of BindAttribLocation and use layout instead.
// this needs GLSL 330 instead of 150
// eg: layout(location=0) in vec4 in_position;
gl.BindAttribLocation(pref, 0, "in_v") // matches vattr in bindModel
gl.BindAttribLocation(pref, 1, "in_n") // matches nattr in bindModel
gl.BindAttribLocation(pref, 2, "in_t") // matches tattr in bindModel
// compile and link the shader program.
if glerr := gl.BindProgram(pref, sh.Vsh, sh.Fsh); glerr != nil {
err = fmt.Errorf("Failed to create shader program: %s\n", glerr)
return
}
// initialize the uniform references
var errmsg string
for label, _ := range sh.Uniforms {
if uid := gl.GetUniformLocation(pref, label); uid >= 0 {
sh.Uniforms[label] = uid
} else {
errnum := gl.GetError()
errmsg += fmt.Sprintf("No %s uniform in shader %X\n", label, errnum)
}
}
if len(errmsg) > 0 {
err = errors.New(errmsg)
}
if glerr := gl.GetError(); glerr != gl.NO_ERROR {
log.Printf("opengl:bindShader need to find and fix error %X", glerr)
}
return
}
// initShader compiles shaders and links them into a shader program.
func (ld *ldtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("monkey", &shader)
ld.shaders = gl.CreateProgram()
gl.BindAttribLocation(ld.shaders, 0, "inPosition")
gl.BindAttribLocation(ld.shaders, 1, "inNormal")
if err := gl.BindProgram(ld.shaders, shader.Vsh, shader.Fsh); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
ld.mvpref = gl.GetUniformLocation(ld.shaders, "modelViewProjectionMatrix")
if ld.mvpref < 0 {
fmt.Printf("No modelViewProjectionMatrix in vertex shader\n")
}
}
// initShader compiles shaders and links them into a shader program.
func (tb *tbtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("tuv", &shader)
tb.shaders = gl.CreateProgram()
gl.BindAttribLocation(tb.shaders, 0, "vertexPosition")
gl.BindAttribLocation(tb.shaders, 2, "uvPoint")
if err := gl.BindProgram(tb.shaders, shader.Vsh, shader.Fsh); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
tb.mvpref = gl.GetUniformLocation(tb.shaders, "Mvpm")
tb.sampler = gl.GetUniformLocation(tb.shaders, "uvSampler")
if tb.mvpref < 0 {
fmt.Printf("No model-view-projection matrix in vertex shader\n")
}
}