void GSRendererHW::SetScaling()
{
GSVector2i crtc_size(GetDisplayRect().width(), GetDisplayRect().height());
// Framebuffer width is always a multiple of 64 so at certain cases it can't cover some weird width values.
// 480P , 576P use width as 720 which is not referencable by FBW * 64. so it produces 704 ( the closest value multiple by 64).
// In such cases, let's just use the CRTC width.
int fb_width = max({ (int)m_context->FRAME.FBW * 64, crtc_size.x , 512 });
// GS doesn't have a specific register for the FrameBuffer height. so we get the height
// from physical units of the display rectangle in case the game uses a heigher value of height.
int fb_height = (fb_width < 1024) ? max(512, crtc_size.y) : 1024;
int upscaled_fb_w = fb_width * m_upscale_multiplier;
int upscaled_fb_h = fb_height * m_upscale_multiplier;
bool good_rt_size = m_width >= upscaled_fb_w && m_height >= upscaled_fb_h;
// No need to resize for native/custom resolutions as default size will be enough for native and we manually get RT Buffer size for custom.
// don't resize until the display rectangle and register states are stabilized.
if ( m_upscale_multiplier <= 1 || good_rt_size)
return;
m_tc->RemovePartial();
m_width = upscaled_fb_w;
m_height = upscaled_fb_h;
printf("Frame buffer size set to %dx%d (%dx%d)\n", fb_width, fb_height , m_width, m_height);
}
void GSRendererHW::SetScaling()
{
GSVector2i crtc_size(GetDisplayRect().width(), GetDisplayRect().height());
// Details of (potential) perf impact of a big framebuffer
// 1/ extra memory
// 2/ texture cache framebuffer rescaling/copy
// 3/ upload of framebuffer (preload hack)
// 4/ framebuffer clear (color/depth/stencil)
// 5/ read back of the frambuffer
// 6/ MSAA
//
// With the solution
// 1/ Nothing to do.Except the texture cache bug (channel shuffle effect)
// most of the market is 1GB of VRAM (and soon 2GB)
// 2/ limit rescaling/copy to the valid data of the framebuffer
// 3/ ??? no solution so far
// 4a/ stencil can be limited to valid data.
// 4b/ is it useful to clear color? depth? (in any case, it ought to be few operation)
// 5/ limit the read to the valid data
// 6/ not support on openGL
// Framebuffer width is always a multiple of 64 so at certain cases it can't cover some weird width values.
// 480P , 576P use width as 720 which is not referencable by FBW * 64. so it produces 704 ( the closest value multiple by 64).
// In such cases, let's just use the CRTC width.
int fb_width = max({ (int)m_context->FRAME.FBW * 64, crtc_size.x , 512 });
// GS doesn't have a specific register for the FrameBuffer height. so we get the height
// from physical units of the display rectangle in case the game uses a heigher value of height.
//
// Gregory: the framebuffer must have enough room to draw
// * at least 2 frames such as FMV (see OI_BlitFMV)
// * high resolution game such as snowblind engine game
//
// Autodetection isn't a good idea because it will create flickering
// If memory consumption is an issue, there are 2 possibilities
// * 1/ Avoid to create hundreds of RT
// * 2/ Use sparse texture (requires recent HW)
//
// Avoid to alternate between 640x1280 and 1280x1024 on snow blind engine game
// int fb_height = (fb_width < 1024) ? 1280 : 1024;
//
// Until performance issue is properly fixed, let's keep an option to reduce the framebuffer size.
int fb_height = m_large_framebuffer ? 1280 :
(fb_width < 1024) ? max(512, crtc_size.y) : 1024;
int upscaled_fb_w = fb_width * m_upscale_multiplier;
int upscaled_fb_h = fb_height * m_upscale_multiplier;
bool good_rt_size = m_width >= upscaled_fb_w && m_height >= upscaled_fb_h;
bool initialized_register_state = (m_context->FRAME.FBW > 1) && (crtc_size.y > 1);
if (!m_upscale_multiplier && initialized_register_state)
{
if (m_height == m_custom_height)
{
float ratio = ceil(static_cast<float>(m_height) / crtc_size.y);
float buffer_scale_offset = (m_large_framebuffer) ? ratio : 0.5f;
ratio = round(ratio + buffer_scale_offset);
m_tc->RemovePartial();
m_width = max(m_width, 1280);
m_height = max(static_cast<int>(crtc_size.y * ratio) , 1024);
}
}
// No need to resize for native/custom resolutions as default size will be enough for native and we manually get RT Buffer size for custom.
// don't resize until the display rectangle and register states are stabilized.
if ( m_upscale_multiplier <= 1 || good_rt_size)
return;
m_tc->RemovePartial();
m_width = upscaled_fb_w;
m_height = upscaled_fb_h;
printf("Frame buffer size set to %dx%d (%dx%d)\n", fb_width, fb_height , m_width, m_height);
}
