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) unloadVolatile() {
// active texture list is probably invalid, clear it
gl.DeleteProgram(shader.program)
// decrement global texture id counters for texture units which had textures bound from this shader
for i := 0; i < len(shader.activeTexUnits); i++ {
if shader.activeTexUnits[i].Valid() {
gl_state.textureCounters[i] = gl_state.textureCounters[i] - 1
}
}
}