func shinit() gl.Int {
vs := loadShader(gl.VERTEX_SHADER, vss)
var sfs string
if *blend {
sfs = bfss
} else {
sfs = fss
}
fs := loadShader(gl.FRAGMENT_SHADER, sfs)
prg := gl.CreateProgram()
gl.AttachShader(prg, vs)
gl.AttachShader(prg, fs)
gl.LinkProgram(prg)
var l int
if *blend {
l = 6
} else {
l = 3
}
gl.UseProgram(prg)
names := []string{"yt1", "cbt1", "crt1", "yt0", "cbt0", "crt0"}
for i := 0; i < l; i++ {
loc := gl.GetUniformLocation(prg, gl.GLString(names[i]))
gl.Uniform1i(loc, gl.Int(i))
}
return gl.GetUniformLocation(prg, gl.GLString("factor"))
}
func SetUniformI(shader, variable string, n int) error {
prog, ok := shader_progs[shader]
if !ok {
return shaderError(fmt.Sprintf("Tried to set a uniform in an unknown shader '%s'", shader))
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
gl.Uniform1i(loc, gl.Int(n))
return nil
}
func (m *Model) draw() {
m.shader.use()
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, m.texture_id)
gl.Uniform1i(m.shader.uniform_texture, 0)
//texcoord
if m.has_uv {
gl.BindBuffer(gl.ARRAY_BUFFER, m.texcoord)
gl.EnableVertexAttribArray(m.shader.attribute_texcoord)
gl.VertexAttribPointer(
m.shader.attribute_texcoord,
2,
gl.FLOAT,
gl.FALSE,
0,
gl.Pointer(nil))
}
gl.BindBuffer(gl.ARRAY_BUFFER, m.buffer)
gl.EnableVertexAttribArray(m.shader.attribute_vertex)
gl.VertexAttribPointer(
m.shader.attribute_vertex,
3,
gl.FLOAT,
gl.FALSE,
0,
gl.Pointer(nil))
gl.BindBuffer(gl.ARRAY_BUFFER, m.normal_buf)
gl.EnableVertexAttribArray(m.shader.attribute_normal)
gl.VertexAttribPointer(
m.shader.attribute_normal,
3,
gl.FLOAT,
gl.FALSE,
0,
gl.Pointer(nil))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, m.index)
gl.DrawElements(gl.TRIANGLES, gl.Sizei(len(m.indices)), gl.UNSIGNED_INT, gl.Pointer(nil))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)
gl.DisableVertexAttribArray(m.shader.attribute_vertex)
gl.DisableVertexAttribArray(m.shader.attribute_normal)
if m.has_uv {
gl.DisableVertexAttribArray(m.shader.attribute_texcoord)
}
}
func SetUniformI(shader, variable string, n int) {
prog, ok := shader_progs[shader]
if !ok {
if !warned_names[shader] {
Warn().Printf("Tried to set a uniform in an unknown shader '%s'", shader)
warned_names[shader] = true
}
return
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*gl.Char)(unsafe.Pointer(&bvariable[0])))
gl.Uniform1i(loc, int32(n))
}
// SetVariablei sets a specified variable to the supplied integer to be passed
// into an effect.
func (effect *Effect) SetVariablei(variable string, val int) error {
var currEffect gl.Int
gl.GetIntegerv(gl.CURRENT_PROGRAM, &currEffect)
if gl.Uint(currEffect) != effect.program {
return errors.New("effect is not currently in use")
}
effect.checkUniformVariable(variable)
gl.Uniform1i(effect.uniforms[variable], gl.Int(val))
return nil
}