3abfce6c04
For golang/go#9306 Change-Id: Ia8778f5b371371d103c55c12606257ee7ca45fd4 Reviewed-on: https://go-review.googlesource.com/17778 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build darwin linux windows
|
|
|
|
package glutil // import "golang.org/x/mobile/exp/gl/glutil"
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"golang.org/x/mobile/exp/f32"
|
|
"golang.org/x/mobile/gl"
|
|
)
|
|
|
|
// CreateProgram creates, compiles, and links a gl.Program.
|
|
func CreateProgram(glctx gl.Context, vertexSrc, fragmentSrc string) (gl.Program, error) {
|
|
program := glctx.CreateProgram()
|
|
if program.Value == 0 {
|
|
return gl.Program{}, fmt.Errorf("glutil: no programs available")
|
|
}
|
|
|
|
vertexShader, err := loadShader(glctx, gl.VERTEX_SHADER, vertexSrc)
|
|
if err != nil {
|
|
return gl.Program{}, err
|
|
}
|
|
fragmentShader, err := loadShader(glctx, gl.FRAGMENT_SHADER, fragmentSrc)
|
|
if err != nil {
|
|
glctx.DeleteShader(vertexShader)
|
|
return gl.Program{}, err
|
|
}
|
|
|
|
glctx.AttachShader(program, vertexShader)
|
|
glctx.AttachShader(program, fragmentShader)
|
|
glctx.LinkProgram(program)
|
|
|
|
// Flag shaders for deletion when program is unlinked.
|
|
glctx.DeleteShader(vertexShader)
|
|
glctx.DeleteShader(fragmentShader)
|
|
|
|
if glctx.GetProgrami(program, gl.LINK_STATUS) == 0 {
|
|
defer glctx.DeleteProgram(program)
|
|
return gl.Program{}, fmt.Errorf("glutil: %s", glctx.GetProgramInfoLog(program))
|
|
}
|
|
return program, nil
|
|
}
|
|
|
|
func loadShader(glctx gl.Context, shaderType gl.Enum, src string) (gl.Shader, error) {
|
|
shader := glctx.CreateShader(shaderType)
|
|
if shader.Value == 0 {
|
|
return gl.Shader{}, fmt.Errorf("glutil: could not create shader (type %v)", shaderType)
|
|
}
|
|
glctx.ShaderSource(shader, src)
|
|
glctx.CompileShader(shader)
|
|
if glctx.GetShaderi(shader, gl.COMPILE_STATUS) == 0 {
|
|
defer glctx.DeleteShader(shader)
|
|
return gl.Shader{}, fmt.Errorf("shader compile: %s", glctx.GetShaderInfoLog(shader))
|
|
}
|
|
return shader, nil
|
|
}
|
|
|
|
// writeAffine writes the contents of an Affine to a 3x3 matrix GL uniform.
|
|
func writeAffine(glctx gl.Context, u gl.Uniform, a *f32.Affine) {
|
|
var m [9]float32
|
|
m[0*3+0] = a[0][0]
|
|
m[0*3+1] = a[1][0]
|
|
m[0*3+2] = 0
|
|
m[1*3+0] = a[0][1]
|
|
m[1*3+1] = a[1][1]
|
|
m[1*3+2] = 0
|
|
m[2*3+0] = a[0][2]
|
|
m[2*3+1] = a[1][2]
|
|
m[2*3+2] = 1
|
|
glctx.UniformMatrix3fv(u, m[:])
|
|
}
|