From 4d959c6bdca6a5545a6d757485ed3824dcb6660b Mon Sep 17 00:00:00 2001
From: FernandoS27 <fsahmkow27@gmail.com>
Date: Thu, 11 Oct 2018 14:33:50 -0400
Subject: Implement Precise 3D Swizzle

---
 src/video_core/textures/decoders.cpp | 74 ++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 3 deletions(-)

(limited to 'src/video_core')

diff --git a/src/video_core/textures/decoders.cpp b/src/video_core/textures/decoders.cpp
index 8ae6dcf9a..d6750b174 100644
--- a/src/video_core/textures/decoders.cpp
+++ b/src/video_core/textures/decoders.cpp
@@ -98,6 +98,74 @@ static void FastSwizzleData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_
     }
 }
 
+void Precise3DProcessGobs(u8* swizzled_data, u8* unswizzled_data, bool unswizzle, const u32 x_start,
+                       const u32 y_start, const u32 z_start, const u32 x_end, const u32 y_end,
+                       const u32 z_end, const u32 tile_offset, const u32 xy_block_size,
+                       const u32 layer_z, const u32 stride_x, const u32 bytes_per_pixel,
+                       const u32 out_bytes_per_pixel) {
+    std::array<u8*, 2> data_ptrs;
+    u32 z_adress = tile_offset;
+    const u32 gob_size = 64 * 8 * 1;
+    for (u32 z = z_start; z < z_end; z++) {
+        u32 y_adress = z_adress;
+        u32 pixel_base = layer_z * z + y_start * stride_x;
+        for (u32 y = y_start; y < y_end; y++) {
+            const auto& table = legacy_swizzle_table[y % 8];
+            for (u32 x = x_start; x < x_end; x++) {
+                const u32 swizzle_offset{y_adress + table[x * bytes_per_pixel % 64]};
+                const u32 pixel_index{x * out_bytes_per_pixel + pixel_base};
+                data_ptrs[unswizzle] = swizzled_data + swizzle_offset;
+                data_ptrs[!unswizzle] = unswizzled_data + pixel_index;
+                std::memcpy(data_ptrs[0], data_ptrs[1], bytes_per_pixel);
+            }
+            pixel_base += stride_x;
+            if ((y + 1) % 8 == 0)
+                y_adress += gob_size;
+        }
+        z_adress += xy_block_size;
+    }
+}
+
+void Precise3DSwizzledData(u8* swizzled_data, u8* unswizzled_data, bool unswizzle, u32 width,
+                        u32 height, u32 depth, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
+                        u32 block_height, u32 block_depth) {
+    auto div_ceil = [](u32 x, u32 y) { return ((x + y - 1) / y); };
+
+    const u32 stride_x = width * out_bytes_per_pixel;
+    const u32 layer_z = height * stride_x;
+    const u32 gob_x_bytes = 64;
+    const u32 gob_elements_x = gob_x_bytes / bytes_per_pixel;
+    const u32 gob_elements_y = 8;
+    const u32 gob_elements_z = 1;
+    const u32 block_x_elements = gob_elements_x;
+    const u32 block_y_elements = gob_elements_y * block_height;
+    const u32 block_z_elements = gob_elements_z * block_depth;
+    const u32 blocks_on_x = div_ceil(width, block_x_elements);
+    const u32 blocks_on_y = div_ceil(height, block_y_elements);
+    const u32 blocks_on_z = div_ceil(depth, block_z_elements);
+    const u32 blocks = blocks_on_x * blocks_on_y * blocks_on_z;
+    const u32 gob_size = gob_x_bytes * gob_elements_y * gob_elements_z;
+    const u32 xy_block_size = gob_size * block_height;
+    const u32 block_size = xy_block_size * block_depth;
+    u32 tile_offset = 0;
+    for (u32 zb = 0; zb < blocks_on_z; zb++) {
+        const u32 z_start = zb * block_z_elements;
+        const u32 z_end = std::min(depth, z_start + block_z_elements);
+        for (u32 yb = 0; yb < blocks_on_y; yb++) {
+            const u32 y_start = yb * block_y_elements;
+            const u32 y_end = std::min(height, y_start + block_y_elements);
+            for (u32 xb = 0; xb < blocks_on_x; xb++) {
+                const u32 x_start = xb * block_x_elements;
+                const u32 x_end = std::min(width, x_start + block_x_elements);
+                Precise3DProcessGobs(swizzled_data, unswizzled_data, unswizzle, x_start, y_start,
+                                  z_start, x_end, y_end, z_end, tile_offset, xy_block_size, layer_z,
+                                  stride_x, bytes_per_pixel, out_bytes_per_pixel);
+                tile_offset += block_size;
+            }
+        }
+    }
+}
+
 void Fast3DProcessGobs(u8* swizzled_data, u8* unswizzled_data, bool unswizzle, const u32 x_start,
                        const u32 y_start, const u32 z_start, const u32 x_end, const u32 y_end,
                        const u32 z_end, const u32 tile_offset, const u32 xy_block_size,
@@ -148,7 +216,7 @@ void Fast3DSwizzledData(u8* swizzled_data, u8* unswizzled_data, bool unswizzle,
     const u32 blocks_on_y = div_ceil(height, block_y_elements);
     const u32 blocks_on_z = div_ceil(depth, block_z_elements);
     const u32 blocks = blocks_on_x * blocks_on_y * blocks_on_z;
-    const u32 gob_size = 64 * 8 * 1;
+    const u32 gob_size = gob_x_bytes * gob_elements_y * gob_elements_z;
     const u32 xy_block_size = gob_size * block_height;
     const u32 block_size = xy_block_size * block_depth;
     u32 tile_offset = 0;
@@ -176,8 +244,8 @@ void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_
         Fast3DSwizzledData(swizzled_data, unswizzled_data, unswizzle, width, height, 1U,
                            bytes_per_pixel, out_bytes_per_pixel, block_height, 1U);
     } else {
-        LegacySwizzleData(width, height, bytes_per_pixel, out_bytes_per_pixel, swizzled_data,
-                          unswizzled_data, unswizzle, block_height);
+        Precise3DSwizzledData(swizzled_data, unswizzled_data, unswizzle, width, height, 1U,
+                           bytes_per_pixel, out_bytes_per_pixel, block_height, 1U);
     }
 }
 
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