func loadShader(shtype gl.Enum, src string) gl.Uint {
sh := gl.CreateShader(shtype)
gsrc := gl.GLString(src)
gl.ShaderSource(sh, 1, &gsrc, nil)
gl.CompileShader(sh)
return sh
}
func (s *Shader) initShader(t gl.Enum, str string, shader *gl.Uint) {
*shader = gl.CreateShader(t)
if *shader == 0 {
fmt.Println("error creating shader of type ", t)
}
src := gl.GLStringArray(str)
defer gl.GLStringArrayFree(src)
gl.ShaderSource(*shader, 1, &src[0], nil)
gl.CompileShader(*shader)
var (
status gl.Int
info_length gl.Int
message *gl.Char
)
gl.GetShaderiv(*shader, gl.COMPILE_STATUS, &status)
if status == gl.FALSE {
fmt.Println("Error compiling shader")
gl.GetShaderiv(*shader, gl.INFO_LOG_LENGTH, &info_length)
message = gl.GLStringAlloc(gl.Sizei(info_length))
gl.GetShaderInfoLog(*shader, gl.Sizei(info_length), nil, message)
fmt.Println(gl.GoString(message))
gl.GLStringFree(message)
}
}
func compileShader(shaderType ShaderType, scripts []*gl.Char) (gl.Uint, error) {
shaderID := gl.CreateShader(gl.Enum(shaderType))
gl.ShaderSource(shaderID, gl.Sizei(len(scripts)), &scripts[0], nil)
gl.CompileShader(shaderID)
if err := checkShaderCompiled(shaderID, shaderType); err != nil {
return 0, err
}
return shaderID, checkForErrors()
}
func RegisterShader(name string, vertex, fragment []byte) error {
if _, ok := shader_progs[name]; ok {
return shaderError(fmt.Sprintf("Tried to register a shader called '%s' twice", name))
}
vertex_id := gl.CreateShader(gl.VERTEX_SHADER)
pointer := &vertex[0]
length := gl.Int(len(vertex))
gl.ShaderSource(vertex_id, 1, (**gl.Char)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(vertex_id)
var param gl.Int
gl.GetShaderiv(vertex_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
return shaderError(fmt.Sprintf("Failed to compile vertex shader '%s': %v", name, param))
}
fragment_id := gl.CreateShader(gl.FRAGMENT_SHADER)
pointer = &fragment[0]
length = gl.Int(len(fragment))
gl.ShaderSource(fragment_id, 1, (**gl.Char)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(fragment_id)
gl.GetShaderiv(fragment_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
return shaderError(fmt.Sprintf("Failed to compile fragment shader '%s': %v", name, param))
}
// shader successfully compiled - now link
program_id := gl.CreateProgram()
gl.AttachShader(program_id, vertex_id)
gl.AttachShader(program_id, fragment_id)
gl.LinkProgram(program_id)
gl.GetProgramiv(program_id, gl.LINK_STATUS, ¶m)
if param == 0 {
return shaderError(fmt.Sprintf("Failed to link shader '%s': %v", name, param))
}
shader_progs[name] = program_id
return nil
}
func InitShaders() {
render.Queue(func() {
vertex_shaders = make(map[string]uint32)
fragment_shaders = make(map[string]uint32)
shader_progs = make(map[string]uint32)
warned_names = make(map[string]bool)
RemoveRegistry("shaders")
RegisterRegistry("shaders", make(map[string]*shaderDef))
RegisterAllObjectsInDir("shaders", filepath.Join(GetDataDir(), "shaders"), ".json", "json")
names := GetAllNamesInRegistry("shaders")
for _, name := range names {
// Load the shader files
shader := Shader{Defname: name}
GetObject("shaders", &shader)
vdata, err := ioutil.ReadFile(filepath.Join(GetDataDir(), shader.Vertex_path))
if err != nil {
Error().Printf("Unable to load vertex shader '%s': %v", shader.Vertex_path, err)
continue
}
fdata, err := ioutil.ReadFile(filepath.Join(GetDataDir(), shader.Fragment_path))
if err != nil {
Error().Printf("Unable to load fragment shader '%s': %v", shader.Fragment_path, err)
continue
}
// Create the vertex shader
vertex_id, ok := vertex_shaders[shader.Vertex_path]
if !ok {
vertex_id = gl.CreateShader(gl.VERTEX_SHADER)
pointer := &vdata[0]
length := int32(len(vdata))
gl.ShaderSource(vertex_id, 1, (**gl.Char)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(vertex_id)
var param int32
gl.GetShaderiv(vertex_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
Error().Printf("Failed to compile vertex shader '%s': %v", shader.Vertex_path, param)
continue
}
}
// Create the fragment shader
fragment_id, ok := fragment_shaders[shader.Fragment_path]
if !ok {
fragment_id = gl.CreateShader(gl.FRAGMENT_SHADER)
pointer := &fdata[0]
length := int32(len(fdata))
gl.ShaderSource(fragment_id, 1, (**gl.Char)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(fragment_id)
var param int32
gl.GetShaderiv(fragment_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
Error().Printf("Failed to compile fragment shader '%s': %v", shader.Fragment_path, param)
continue
}
}
// shader successfully compiled - now link
program_id := gl.CreateProgram()
gl.AttachShader(program_id, vertex_id)
gl.AttachShader(program_id, fragment_id)
gl.LinkProgram(program_id)
var param int32
gl.GetProgramiv(program_id, gl.LINK_STATUS, ¶m)
if param == 0 {
Error().Printf("Failed to link shader '%s': %v", shader.Name, param)
continue
}
vertex_shaders[shader.Vertex_path] = vertex_id
fragment_shaders[shader.Fragment_path] = fragment_id
shader_progs[shader.Name] = program_id
}
})
}