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shader.go
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shader.go
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package main
import (
"github.com/gopherjs/webgl"
"github.com/gopherjs/gopherjs/js"
"net/http"
"io/ioutil"
"fmt"
)
type Shader struct {
vs_source string
fs_source string
vs *js.Object
fs *js.Object
program *js.Object
}
func (s *Shader) compile(gl *webgl.Context, shaderType int, source string) *js.Object {
newShader := gl.CreateShader(shaderType)
gl.ShaderSource(newShader, source)
gl.CompileShader(newShader)
fmt.Println(gl.GetShaderInfoLog(newShader))
return newShader
}
func (s *Shader) link(gl *webgl.Context) {
s.program = gl.CreateProgram()
gl.AttachShader(s.program, s.vs)
gl.AttachShader(s.program, s.fs)
gl.LinkProgram(s.program)
}
func readFile(p string) string {
var returns string
var client http.Client
resp, err := client.Get(p)
if err != nil {
// err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
bodyBytes, _ := ioutil.ReadAll(resp.Body)
returns = string(bodyBytes)
}
return returns
}
func (s *Shader) loadShader(gl *webgl.Context, vsPath string, fsPath string) {
s.vs_source = readFile(vsPath)
s.fs_source = readFile(fsPath)
s.vs = s.compile(gl, gl.VERTEX_SHADER, s.vs_source)
s.fs = s.compile(gl, gl.FRAGMENT_SHADER, s.fs_source)
s.link(gl)
}