From c765eb86debdc06fe304511bc2edbb6f3e3d7813 Mon Sep 17 00:00:00 2001
From: Justin Weiss
Date: Sun, 13 Sep 2020 20:06:57 -0700
Subject: Add a threaded renderer

This change adds a gpulib implementation that accepts GPU commands and
runs them through a real gpulib implementation on a thread. Depending
on a setting, it can either force a sync every frame, or continue to
work until the next frame arrives.
---
 frontend/libretro.c              | 17 ++++++++++++++++-
 frontend/libretro_core_options.h | 14 ++++++++++++++
 frontend/main.c                  |  2 ++
 frontend/menu.c                  |  1 +
 frontend/plugin_lib.h            |  5 +++++
 5 files changed, 38 insertions(+), 1 deletion(-)

(limited to 'frontend')

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 93bfc28..323932a 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -1818,6 +1818,21 @@ static void update_variables(bool in_flight)
          Config.SpuIrq = 1;
    }
 
+#ifdef THREAD_RENDERING
+   var.key = "pcsx_rearmed_gpu_thread_rendering";
+   var.value = NULL;
+
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+   {
+      if (strcmp(var.value, "disabled") == 0)
+         pl_rearmed_cbs.thread_rendering = THREAD_RENDERING_OFF;
+      else if (strcmp(var.value, "sync") == 0)
+         pl_rearmed_cbs.thread_rendering = THREAD_RENDERING_SYNC;
+      else if (strcmp(var.value, "async") == 0)
+         pl_rearmed_cbs.thread_rendering = THREAD_RENDERING_ASYNC;
+   }
+#endif
+
 #ifdef GPU_PEOPS
    var.value = NULL;
    var.key = "pcsx_rearmed_gpu_peops_odd_even_bit";
@@ -2031,7 +2046,7 @@ static void update_variables(bool in_flight)
             "pcsx_rearmed_gpu_unai_fast_lighting",
             "pcsx_rearmed_gpu_unai_ilace_force",
             "pcsx_rearmed_gpu_unai_pixel_skip",
-            "pcsx_rearmed_gpu_unai_scale_hires"
+            "pcsx_rearmed_gpu_unai_scale_hires",
          };
 
          option_display.visible = show_advanced_gpu_unai_settings;
diff --git a/frontend/libretro_core_options.h b/frontend/libretro_core_options.h
index 941bd81..1075e8f 100644
--- a/frontend/libretro_core_options.h
+++ b/frontend/libretro_core_options.h
@@ -972,6 +972,20 @@ struct retro_core_option_definition option_defs_us[] = {
       },
       "disabled",
    },
+#ifdef THREAD_RENDERING
+   {
+      "pcsx_rearmed_gpu_thread_rendering",
+      "Threaded Rendering",
+      "When enabled, runs GPU commands in a thread. Sync waits for drawing to finish before vsync. Async will not wait unless there's another frame behind it.",
+      {
+         { "disabled", NULL },
+         { "sync",  NULL },
+         { "async",  NULL },
+         { NULL, NULL},
+      },
+      "disabled",
+   },
+#endif
 #endif /* GPU UNAI Advanced Settings */
 
    {
diff --git a/frontend/main.c b/frontend/main.c
index 51cb7bf..d3c7d40 100644
--- a/frontend/main.c
+++ b/frontend/main.c
@@ -125,6 +125,8 @@ void emu_set_default_config(void)
 	Config.SpuIrq = Config.RCntFix = Config.VSyncWA = 0;
 	Config.PsxAuto = 1;
 
+	pl_rearmed_cbs.thread_rendering = 0;
+
 	pl_rearmed_cbs.gpu_neon.allow_interlace = 2; // auto
 	pl_rearmed_cbs.gpu_neon.enhancement_enable =
 	pl_rearmed_cbs.gpu_neon.enhancement_no_main = 0;
diff --git a/frontend/menu.c b/frontend/menu.c
index e5c2738..bd56cf4 100644
--- a/frontend/menu.c
+++ b/frontend/menu.c
@@ -420,6 +420,7 @@ static const struct {
 	CE_INTVAL_N("adev0_is_nublike", in_adev_is_nublike[0]),
 	CE_INTVAL_N("adev1_is_nublike", in_adev_is_nublike[1]),
 	CE_INTVAL_V(frameskip, 3),
+	CE_INTVAL_P(thread_rendering),
 	CE_INTVAL_P(gpu_peops.iUseDither),
 	CE_INTVAL_P(gpu_peops.dwActFixes),
 	CE_INTVAL_P(gpu_unai.ilace_force),
diff --git a/frontend/plugin_lib.h b/frontend/plugin_lib.h
index 114aaad..71dfcb5 100644
--- a/frontend/plugin_lib.h
+++ b/frontend/plugin_lib.h
@@ -1,6 +1,10 @@
 #ifndef __PLUGIN_LIB_H__
 #define __PLUGIN_LIB_H__
 
+#define THREAD_RENDERING_OFF   0
+#define THREAD_RENDERING_SYNC  1
+#define THREAD_RENDERING_ASYNC 2
+
 enum {
 	DKEY_SELECT = 0,
 	DKEY_L3,
@@ -70,6 +74,7 @@ struct rearmed_cbs {
 	unsigned int *gpu_hcnt;
 	unsigned int flip_cnt; // increment manually if not using pl_vout_flip
 	unsigned int only_16bpp; // platform is 16bpp-only
+	unsigned int thread_rendering;
 	struct {
 		int   allow_interlace; // 0 off, 1 on, 2 guess
 		int   enhancement_enable;
-- 
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