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 (shader *Shader) mapUniforms() {
// Built-in uniform locations default to -1 (nonexistent.)
shader.uniforms = map[string]uniform{}
for i := 0; i < gl.GetProgrami(shader.program, gl.ACTIVE_UNIFORMS); i++ {
u := uniform{}
u.Name, u.Count, u.Type = gl.GetActiveUniform(shader.program, uint32(i))
u.Location = gl.GetUniformLocation(shader.program, u.Name)
u.CalculateTypeInfo()
// glGetActiveUniform appends "[0]" to the end of array uniform names...
if len(u.Name) > 3 {
if strings.Contains(u.Name, "[0]") {
u.Name = u.Name[:len(u.Name)-3]
}
}
if u.Location.Value != -1 {
shader.uniforms[u.Name] = u
}
}
}