// 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 (tag *trtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("basic", &shader)
tag.shaders = gl.CreateProgram()
if err := gl.BindProgram(tag.shaders, shader.Vsh, shader.Fsh); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
tag.mvpRef = gl.GetUniformLocation(tag.shaders, "Mvpm")
if tag.mvpRef < 0 {
fmt.Printf("No model-view-projection matrix in vertex shader\n")
}
}
// 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")
}
}
// initScene is one time initialization that creates a single VAO
func (sf *sftag) initScene() {
sf.mvp32 = &render.M4{}
sf.sTime = time.Now()
sf.initData()
// Bind the OpenGL calls and dump some version info.
gl.Init()
fmt.Printf("%s %s", gl.GetString(gl.RENDERER), gl.GetString(gl.VERSION))
fmt.Printf(" GLSL %s\n", gl.GetString(gl.SHADING_LANGUAGE_VERSION))
gl.GenVertexArrays(1, &sf.vao)
gl.BindVertexArray(sf.vao)
// vertex data.
var vbuff uint32
gl.GenBuffers(1, &vbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, vbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(sf.points)*4), gl.Pointer(&(sf.points[0])), gl.STATIC_DRAW)
var vattr uint32 = 0
gl.VertexAttribPointer(vattr, 4, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(vattr)
// faces data.
var ebuff uint32
gl.GenBuffers(1, &ebuff)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuff)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, int64(len(sf.faces)), gl.Pointer(&(sf.faces[0])), gl.STATIC_DRAW)
// create texture and shaders after all the data has been set up.
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("fire", &shader)
sf.shaders = gl.CreateProgram()
if err := gl.BindProgram(sf.shaders, shader.Vsh, shader.Fsh); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
sf.mvpref = gl.GetUniformLocation(sf.shaders, "Mvpm")
sf.gTime = gl.GetUniformLocation(sf.shaders, "time")
sf.sizes = gl.GetUniformLocation(sf.shaders, "resolution")
sf.ortho = lin.NewOrtho(0, 4, 0, 4, 0, 10)
// set some state that doesn't need to change during drawing.
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
}