diff options
Diffstat (limited to '')
| -rw-r--r-- | src/core/hw/gpu.cpp | 63 | ||||
| -rw-r--r-- | src/core/hw/gpu.h | 1 | ||||
| -rw-r--r-- | src/core/settings.h | 1 |
3 files changed, 38 insertions, 27 deletions
diff --git a/src/core/hw/gpu.cpp b/src/core/hw/gpu.cpp index 7e70b34c1..dd619cb16 100644 --- a/src/core/hw/gpu.cpp +++ b/src/core/hw/gpu.cpp @@ -21,10 +21,14 @@ namespace GPU { Regs g_regs; -static u64 frame_ticks = 0; ///< 268MHz / 60 frames per second -static u32 cur_line = 0; ///< Current vertical screen line -static u64 last_frame_ticks = 0; ///< CPU tick count from last frame -static u64 last_update_tick = 0; ///< CPU ticl count from last GPU update +bool g_skip_frame = false; ///< True if the current frame was skipped + +static u64 frame_ticks = 0; ///< 268MHz / gpu_refresh_rate frames per second +static u64 line_ticks = 0; ///< Number of ticks for a screen line +static u32 cur_line = 0; ///< Current screen line +static u64 last_update_tick = 0; ///< CPU ticl count from last GPU update +static u64 frame_count = 0; ///< Number of frames drawn +static bool last_skip_frame = false; ///< True if the last frame was skipped template <typename T> inline void Read(T &var, const u32 raw_addr) { @@ -178,38 +182,40 @@ template void Write<u8>(u32 addr, const u8 data); void Update() { auto& framebuffer_top = g_regs.framebuffer_config[0]; - // Update the frame after a certain number of CPU ticks have elapsed. This assumes that the - // active frame in memory is always complete to render. There also may be issues with this - // becoming out-of-synch with GSP synchrinization code (as follows). At this time, this seems to - // be the most effective solution for both homebrew and retail applications. With retail, this - // could be moved below (and probably would guarantee more accurate synchronization). However, - // primitive homebrew relies on a vertical blank interrupt to happen inevitably (regardless of a - // threading reschedule). - - if ((Core::g_app_core->GetTicks() - last_frame_ticks) > (GPU::frame_ticks)) { - VideoCore::g_renderer->SwapBuffers(); - last_frame_ticks = Core::g_app_core->GetTicks(); - } - // Synchronize GPU on a thread reschedule: Because we cannot accurately predict a vertical // blank, we need to simulate it. Based on testing, it seems that retail applications work more // accurately when this is signalled between thread switches. if (HLE::g_reschedule) { u64 current_ticks = Core::g_app_core->GetTicks(); - u64 line_ticks = (GPU::frame_ticks / framebuffer_top.height) * 16; + u32 num_lines = static_cast<u32>((current_ticks - last_update_tick) / line_ticks); - //// Synchronize line... - if ((current_ticks - last_update_tick) >= line_ticks) { + // Synchronize line... + if (num_lines > 0) { GSP_GPU::SignalInterrupt(GSP_GPU::InterruptId::PDC0); - cur_line++; - last_update_tick += line_ticks; + cur_line += num_lines; + last_update_tick += (num_lines * line_ticks); } // Synchronize frame... if (cur_line >= framebuffer_top.height) { cur_line = 0; - VideoCore::g_renderer->SwapBuffers(); + frame_count++; + last_skip_frame = g_skip_frame; + g_skip_frame = (frame_count & Settings::values.frame_skip) != 0; + + // Swap buffers based on the frameskip mode, which is a little bit tricky. When + // a frame is being skipped, nothing is being rendered to the internal framebuffer(s). + // So, we should only swap frames if the last frame was rendered. The rules are: + // - If frameskip == 0 (disabled), always swap buffers + // - If frameskip == 1, swap buffers every other frame (starting from the first frame) + // - If frameskip > 1, swap buffers every frameskip^n frames (starting from the second frame) + + if ((((Settings::values.frame_skip != 1) ^ last_skip_frame) && last_skip_frame != g_skip_frame) || + Settings::values.frame_skip == 0) { + VideoCore::g_renderer->SwapBuffers(); + } + GSP_GPU::SignalInterrupt(GSP_GPU::InterruptId::PDC1); } } @@ -217,10 +223,6 @@ void Update() { /// Initialize hardware void Init() { - frame_ticks = 268123480 / Settings::values.gpu_refresh_rate; - cur_line = 0; - last_update_tick = last_frame_ticks = Core::g_app_core->GetTicks(); - auto& framebuffer_top = g_regs.framebuffer_config[0]; auto& framebuffer_sub = g_regs.framebuffer_config[1]; @@ -249,6 +251,13 @@ void Init() { framebuffer_sub.color_format = Regs::PixelFormat::RGB8; framebuffer_sub.active_fb = 0; + frame_ticks = 268123480 / Settings::values.gpu_refresh_rate; + line_ticks = (GPU::frame_ticks / framebuffer_top.height); + cur_line = 0; + last_update_tick = Core::g_app_core->GetTicks(); + last_skip_frame = false; + g_skip_frame = false; + LOG_DEBUG(HW_GPU, "initialized OK"); } diff --git a/src/core/hw/gpu.h b/src/core/hw/gpu.h index 68f11bfcb..292f496c1 100644 --- a/src/core/hw/gpu.h +++ b/src/core/hw/gpu.h @@ -241,6 +241,7 @@ ASSERT_REG_POSITION(command_processor_config, 0x00638); static_assert(sizeof(Regs) == 0x1000 * sizeof(u32), "Invalid total size of register set"); extern Regs g_regs; +extern bool g_skip_frame; template <typename T> void Read(T &var, const u32 addr); diff --git a/src/core/settings.h b/src/core/settings.h index 4808872ae..4b8928847 100644 --- a/src/core/settings.h +++ b/src/core/settings.h @@ -31,6 +31,7 @@ struct Values { // Core int cpu_core; int gpu_refresh_rate; + int frame_skip; // Data Storage bool use_virtual_sd; |