void Device::Clear(CLEAR_FLAG flags)
{
glShadeModel(GL_SMOOTH);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
GLfloat lightModelAmbient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lightModelAmbient);
GLfloat lightAmbient[] = { 0.25f, 0.25f, 0.25f, 1.0f };
glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient);
GLfloat lightDiffuse[] = { 0.75f, 0.75f, 0.75f, 1.0f };
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse);
GLfloat materialAmbient[] = { 1.0f, 1.0f, 1.0f, 1.0f };
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, materialAmbient);
GLfloat materialDiffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, materialDiffuse);
GLfloat lightPosition[] = { 0.0f, 0.0f, 2.5f, 1.0f };
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
glEnable(GL_COLOR_MATERIAL);
SetClearStencil(0);
SetClearDepth(1);
glClear((flags & CLEAR_FLAG::Color ? GL_COLOR_BUFFER_BIT : 0) | (flags & CLEAR_FLAG::Depth ? GL_DEPTH_BUFFER_BIT : 0) | (flags & CLEAR_FLAG::Stencil ? GL_STENCIL_BUFFER_BIT : 0));
}
void Graphics::ResetCachedState()
{
Program::Clear();
viewport_ = Recti(0);
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &systemFbo_); // On IOS default FBO is not zero
// Set up texture data read/write alignment
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
VertexArrayObj::Clear();
lastMesh_ = nullptr;
lastProgram_ = nullptr;
activeMesh_ = nullptr;
activeWindow_ = nullptr;
CHECK_GL_STATUS();
SetClearColor(Color(0, 0, 0, 1));
SetClearDepth(1);
SetClearStencil(0);
SetFrameBuffer(nullptr);
SetStencilTest(DEFAULT_STENCIL_ENABLE, DEFAULT_STENCIL_WRITEMASK, DEFAULT_STENCIL_SFAIL,
DEFAULT_STENCIL_DPFAIL, DEFAULT_STENCIL_DPPASS, DEFAULT_STENCIL_FUNC, DEFAULT_STENCIL_REF, DEFAULT_STENCIL_COMPAREMASK);
SetScissorTest();
CHECK_GL_STATUS();
SetColorMask(DEFAULT_COLOR_MASK);
SetDepthMask(DEFAULT_DEPTH_MASK);
SetDepthFunc(DepthFunc::LESS);
SetStencilMask(DEFAULT_STENCIL_MASK);
SetBlendModeTest(DEFAULT_BLEND_MODE);
EnableDepthTest(DEFAULT_DEPTH_TEST_ENABLE);
EnableCullFace(DEFAULT_CULL_FACE_ENABLE);
SetCullFace(CullFaceMode::DEFAULT);
SetFrontFace(FrontFaceMode::DEFAULT);
CHECK_GL_STATUS();
UnboundTextures();
SetVertexArrayObj(nullptr);
SetVertexBuffer(nullptr);
SetIndexBuffer(nullptr);
SetProgram(nullptr);
SetSlopeScaledBias(0);
CHECK_GL_STATUS();
}
void Graphics::ClearStencilBuffer(GLint value)
{
SetScissorTest();
SetClearStencil(value);
glClear(GL_STENCIL_BUFFER_BIT);
}