func (s *openGLState) reset(context *opengl.Context) error {
if err := context.Reset(); err != nil {
return err
}
s.lastProgram = zeroProgram
s.lastProjectionMatrix = nil
s.lastColorMatrix = nil
s.lastColorMatrixTranslation = nil
if s.arrayBuffer != zeroBuffer {
context.DeleteBuffer(s.arrayBuffer)
}
if s.indexBufferQuads != zeroBuffer {
context.DeleteBuffer(s.indexBufferQuads)
}
if s.programTexture != zeroProgram {
context.DeleteProgram(s.programTexture)
}
shaderVertexModelviewNative, err := context.NewShader(opengl.VertexShader, shader(context, shaderVertexModelview))
if err != nil {
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
}
defer context.DeleteShader(shaderVertexModelviewNative)
shaderFragmentTextureNative, err := context.NewShader(opengl.FragmentShader, shader(context, shaderFragmentTexture))
if err != nil {
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
}
defer context.DeleteShader(shaderFragmentTextureNative)
s.programTexture, err = context.NewProgram([]opengl.Shader{
shaderVertexModelviewNative,
shaderFragmentTextureNative,
})
if err != nil {
return err
}
s.arrayBuffer = theArrayBufferLayout.newArrayBuffer(context)
indices := make([]uint16, 6*maxQuads)
for i := uint16(0); i < maxQuads; i++ {
indices[6*i+0] = 4*i + 0
indices[6*i+1] = 4*i + 1
indices[6*i+2] = 4*i + 2
indices[6*i+3] = 4*i + 1
indices[6*i+4] = 4*i + 2
indices[6*i+5] = 4*i + 3
}
s.indexBufferQuads = context.NewBuffer(opengl.ElementArrayBuffer, indices, opengl.StaticDraw)
return nil
}
func (a *arrayBufferLayout) newArrayBuffer(c *opengl.Context) opengl.Buffer {
return c.NewBuffer(opengl.ArrayBuffer, a.totalBytes()*4*maxQuads, opengl.DynamicDraw)
}