func (shader *Shader) loadVolatile() bool {
vert := compileCode(gl.VERTEX_SHADER, shader.vertex_code)
frag := compileCode(gl.FRAGMENT_SHADER, shader.pixel_code)
shader.program = gl.CreateProgram()
shader.texUnitPool = make(map[string]int)
shader.activeTexUnits = make([]gl.Texture, maxTextureUnits)
gl.AttachShader(shader.program, vert)
gl.AttachShader(shader.program, frag)
gl.BindAttribLocation(shader.program, attrib_pos, "VertexPosition")
gl.BindAttribLocation(shader.program, attrib_texcoord, "VertexTexCoord")
gl.BindAttribLocation(shader.program, attrib_color, "VertexColor")
gl.BindAttribLocation(shader.program, attrib_constantcolor, "ConstantColor")
gl.LinkProgram(shader.program)
gl.DeleteShader(vert)
gl.DeleteShader(frag)
if gl.GetProgrami(shader.program, gl.LINK_STATUS) == 0 {
gl.DeleteProgram(shader.program)
panic(fmt.Errorf("shader link error: %s", gl.GetProgramInfoLog(shader.program)))
}
shader.mapUniforms()
return true
}
func compileCode(shaderType gl.Enum, src string) gl.Shader {
shader := gl.CreateShader(shaderType)
if !shader.Valid() {
panic(fmt.Errorf("could not create shader (type %v)", shaderType))
}
gl.ShaderSource(shader, src)
gl.CompileShader(shader)
if gl.GetShaderi(shader, gl.COMPILE_STATUS) == 0 {
defer gl.DeleteShader(shader)
panic(fmt.Errorf("shader compile: %s", gl.GetShaderInfoLog(shader)))
}
return shader
}