From 7956599fa5f666016f71870d9889748c97839041 Mon Sep 17 00:00:00 2001
From: notaz
Date: Mon, 22 Oct 2012 01:42:56 +0300
Subject: psx_gpu: select buffers differently

this handles weird drawing areas better
---
 plugins/gpu_neon/psx_gpu/psx_gpu.h       |  3 ++-
 plugins/gpu_neon/psx_gpu/psx_gpu_4x.c    |  6 +++++
 plugins/gpu_neon/psx_gpu/psx_gpu_parse.c | 40 ++++++++++++++++++++++++--------
 3 files changed, 38 insertions(+), 11 deletions(-)

(limited to 'plugins/gpu_neon/psx_gpu')

diff --git a/plugins/gpu_neon/psx_gpu/psx_gpu.h b/plugins/gpu_neon/psx_gpu/psx_gpu.h
index f8547f3..846658c 100644
--- a/plugins/gpu_neon/psx_gpu/psx_gpu.h
+++ b/plugins/gpu_neon/psx_gpu/psx_gpu.h
@@ -188,10 +188,11 @@ typedef struct
   s16 saved_viewport_start_y;
   s16 saved_viewport_end_x;
   s16 saved_viewport_end_y;
+  u8 enhancement_buf_by_x16[64];
 
   // Align up to 64 byte boundary to keep the upcoming buffers cache line
   // aligned, also make reachable with single immediate addition
-  u8 reserved_a[228];
+  u8 reserved_a[164];
 
   // 8KB
   block_struct blocks[MAX_BLOCKS_PER_ROW];
diff --git a/plugins/gpu_neon/psx_gpu/psx_gpu_4x.c b/plugins/gpu_neon/psx_gpu/psx_gpu_4x.c
index 19c4a9e..83c6680 100644
--- a/plugins/gpu_neon/psx_gpu/psx_gpu_4x.c
+++ b/plugins/gpu_neon/psx_gpu/psx_gpu_4x.c
@@ -1,3 +1,7 @@
+#define select_enhancement_buf_ptr(psx_gpu, x) \
+  ((psx_gpu)->enhancement_buf_ptr + \
+   ((psx_gpu)->enhancement_buf_by_x16[(x) / 16] << 20))
+
 #ifndef NEON_BUILD
 void setup_sprite_16bpp_4x(psx_gpu_struct *psx_gpu, s32 x, s32 y, s32 u,
  s32 v, s32 width, s32 height, u32 color)
@@ -331,6 +335,8 @@ void render_sprite_4x(psx_gpu_struct *psx_gpu, s32 x, s32 y, u32 u, u32 v,
   if((width <= 0) || (height <= 0))
     return;
 
+  psx_gpu->vram_out_ptr = select_enhancement_buf_ptr(psx_gpu, x);
+
   x *= 2;
   y *= 2;
 
diff --git a/plugins/gpu_neon/psx_gpu/psx_gpu_parse.c b/plugins/gpu_neon/psx_gpu/psx_gpu_parse.c
index 4260bc7..0536613 100644
--- a/plugins/gpu_neon/psx_gpu/psx_gpu_parse.c
+++ b/plugins/gpu_neon/psx_gpu/psx_gpu_parse.c
@@ -762,17 +762,26 @@ breakloop:
 
 #ifdef PCSX
 
-static void *select_enhancement_buf_ptr(psx_gpu_struct *psx_gpu, u32 x)
+static void update_enhancement_buf_table(psx_gpu_struct *psx_gpu)
 {
-  u32 b;
-  for (b = 0; x >= psx_gpu->enhancement_x_threshold; b++)
-    x -= psx_gpu->enhancement_x_threshold;
-  return psx_gpu->enhancement_buf_ptr + b * 1024 * 1024;
+  u32 b, x, s;
+
+  b = 0;
+  s = psx_gpu->enhancement_x_threshold;
+  for (x = 0; x < sizeof(psx_gpu->enhancement_buf_by_x16); x++)
+  {
+    if (x * 16 >= s - 15)
+    {
+      s += psx_gpu->enhancement_x_threshold;
+      b++;
+    }
+    psx_gpu->enhancement_buf_by_x16[x] = b;
+  }
 }
 
 #define select_enhancement_buf(psx_gpu) \
   psx_gpu->enhancement_current_buf_ptr = \
-    select_enhancement_buf_ptr(psx_gpu, psx_gpu->saved_viewport_start_x + 8)
+    select_enhancement_buf_ptr(psx_gpu, psx_gpu->saved_viewport_start_x)
 
 #define enhancement_disable() { \
   psx_gpu->vram_out_ptr = psx_gpu->vram_ptr; \
@@ -939,12 +948,12 @@ static void do_sprite_enhanced(psx_gpu_struct *psx_gpu, int x, int y,
   u32 flags = (cmd_rgb >> 24);
   u32 color = cmd_rgb & 0xffffff;
 
-  psx_gpu->vram_out_ptr = psx_gpu->enhancement_current_buf_ptr;
   render_sprite_4x(psx_gpu, x, y, u, v, w, h, flags, color);
 }
 #endif
 
-u32 gpu_parse_enhanced(psx_gpu_struct *psx_gpu, u32 *list, u32 size, u32 *last_command)
+u32 gpu_parse_enhanced(psx_gpu_struct *psx_gpu, u32 *list, u32 size,
+ u32 *last_command)
 {
   u32 current_command = 0, command_length;
 
@@ -987,7 +996,7 @@ u32 gpu_parse_enhanced(psx_gpu_struct *psx_gpu, u32 *list, u32 size, u32 *last_c
 
         do_fill(psx_gpu, x, y, width, height, color);
 
-        psx_gpu->vram_out_ptr = psx_gpu->enhancement_current_buf_ptr;
+        psx_gpu->vram_out_ptr = select_enhancement_buf_ptr(psx_gpu, x);
         x *= 2;
         y *= 2;
         width *= 2;
@@ -1403,10 +1412,20 @@ u32 gpu_parse_enhanced(psx_gpu_struct *psx_gpu, u32 *list, u32 size, u32 *last_c
       }
   
       case 0xE3:
+      {
+        u32 d;
         psx_gpu->viewport_start_x = list[0] & 0x3FF;
         psx_gpu->viewport_start_y = (list[0] >> 10) & 0x1FF;
         psx_gpu->saved_viewport_start_x = psx_gpu->viewport_start_x;
         psx_gpu->saved_viewport_start_y = psx_gpu->viewport_start_y;
+
+        d = psx_gpu->enhancement_x_threshold - psx_gpu->viewport_start_x;
+        if(unlikely(0 < d && d <= 8))
+        {
+          // Grandia hack..
+          psx_gpu->enhancement_x_threshold = psx_gpu->viewport_start_x;
+          update_enhancement_buf_table(psx_gpu);
+        }
         select_enhancement_buf(psx_gpu);
 
 #ifdef TEXTURE_CACHE_4BPP
@@ -1417,7 +1436,8 @@ u32 gpu_parse_enhanced(psx_gpu_struct *psx_gpu, u32 *list, u32 size, u32 *last_c
 #endif
         SET_Ex(3, list[0]);
         break;
-  
+      }
+
       case 0xE4:
         psx_gpu->viewport_end_x = list[0] & 0x3FF;
         psx_gpu->viewport_end_y = (list[0] >> 10) & 0x1FF;
-- 
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