void opengl_window::destroying()
{
activate_context();
if (iFrameBufferSize != size{})
{
glCheck(glDeleteRenderbuffers(1, &iDepthStencilBuffer));
glCheck(glDeleteTextures(1, &iFrameBufferTexture));
glCheck(glDeleteFramebuffers(1, &iFrameBuffer));
}
deactivate_context();
}
void sdl_window::destroyed()
{
if (!iDestroyed)
{
iDestroyed = true;
opengl_window::destroyed();
iNativeHandle = 0;
}
bool activateDefaultContext = true;
while (!context_activation_stack().empty() && context_activation_stack().back() == this)
{
activateDefaultContext = false;
deactivate_context();
}
if (activateDefaultContext)
do_activate_default_context();
}
void opengl_window::render()
{
if (iRendering || processing_event())
return;
uint64_t now = app::instance().program_elapsed_ms();
if (iFrameRate != boost::none && now - iLastFrameTime < 1000 / *iFrameRate)
return;
if (!iEventHandler.native_window_ready_to_render())
return;
rendering_check.trigger();
if (iInvalidatedRects.empty())
return;
++iFrameCounter;
iRendering = true;
iLastFrameTime = now;
rendering.trigger();
rect invalidatedRect = *iInvalidatedRects.begin();
for (const auto& ir : iInvalidatedRects)
{
invalidatedRect = invalidatedRect.combine(ir);
}
iInvalidatedRects.clear();
invalidatedRect.cx = std::min(invalidatedRect.cx, surface_size().cx - invalidatedRect.x);
invalidatedRect.cy = std::min(invalidatedRect.cy, surface_size().cy - invalidatedRect.y);
static bool initialized = false;
if (!initialized)
{
rendering_engine().initialize();
initialized = true;
}
activate_context();
glCheck(glViewport(0, 0, static_cast<GLsizei>(extents().cx), static_cast<GLsizei>(extents().cy)));
glCheck(glMatrixMode(GL_PROJECTION));
glCheck(glLoadIdentity());
glCheck(glScalef(1.0, 1.0, 1.0));
glCheck(glMatrixMode(GL_MODELVIEW));
glCheck(glLoadIdentity());
const auto& logicalCoordinates = logical_coordinates();
glCheck(glOrtho(logicalCoordinates[0], logicalCoordinates[2], logicalCoordinates[1], logicalCoordinates[3], -1.0, 1.0));
glCheck(glEnableClientState(GL_VERTEX_ARRAY));
glCheck(glEnableClientState(GL_COLOR_ARRAY));
glCheck(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
glCheck(glEnable(GL_TEXTURE_2D));
glCheck(glEnable(GL_MULTISAMPLE));
glCheck(glEnable(GL_BLEND));
if (iFrameBufferSize.cx < static_cast<double>(extents().cx) || iFrameBufferSize.cy < static_cast<double>(extents().cy))
{
if (iFrameBufferSize != size{})
{
glCheck(glDeleteRenderbuffers(1, &iDepthStencilBuffer));
glCheck(glDeleteTextures(1, &iFrameBufferTexture));
glCheck(glDeleteFramebuffers(1, &iFrameBuffer));
}
iFrameBufferSize = size(
iFrameBufferSize.cx < extents().cx ? extents().cx * 1.5f : iFrameBufferSize.cx,
iFrameBufferSize.cy < extents().cy ? extents().cy * 1.5f : iFrameBufferSize.cy);
glCheck(glGenFramebuffers(1, &iFrameBuffer));
glCheck(glBindFramebuffer(GL_FRAMEBUFFER, iFrameBuffer));
glCheck(glGenTextures(1, &iFrameBufferTexture));
glCheck(glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, iFrameBufferTexture));
glCheck(glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, static_cast<GLsizei>(iFrameBufferSize.cx), static_cast<GLsizei>(iFrameBufferSize.cy), true));
glCheck(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, iFrameBufferTexture, 0));
glCheck(glGenRenderbuffers(1, &iDepthStencilBuffer));
glCheck(glBindRenderbuffer(GL_RENDERBUFFER, iDepthStencilBuffer));
glCheck(glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_DEPTH24_STENCIL8, static_cast<GLsizei>(iFrameBufferSize.cx), static_cast<GLsizei>(iFrameBufferSize.cy)));
glCheck(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, iDepthStencilBuffer));
glCheck(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, iDepthStencilBuffer));
}
else
{
glCheck(glBindFramebuffer(GL_FRAMEBUFFER, iFrameBuffer));
glCheck(glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, iFrameBufferTexture));
glCheck(glBindRenderbuffer(GL_RENDERBUFFER, iDepthStencilBuffer));
}
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_NO_ERROR && status != GL_FRAMEBUFFER_COMPLETE)
throw failed_to_create_framebuffer(status);
glCheck(glBindFramebuffer(GL_FRAMEBUFFER, iFrameBuffer));
GLenum drawBuffers[] = { GL_COLOR_ATTACHMENT0 };
glCheck(glDrawBuffers(sizeof(drawBuffers) / sizeof(drawBuffers[0]), drawBuffers));
glCheck(iEventHandler.native_window_render(invalidatedRect));
glCheck(glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0));
glCheck(glBindFramebuffer(GL_READ_FRAMEBUFFER, iFrameBuffer));
glCheck(glBlitFramebuffer(0, 0, static_cast<GLint>(extents().cx), static_cast<GLint>(extents().cy), 0, 0, static_cast<GLint>(extents().cx), static_cast<GLint>(extents().cy), GL_COLOR_BUFFER_BIT, GL_NEAREST));
display();
deactivate_context();
iRendering = false;
rendering_finished.trigger();
}
