From f4432b5d0cb0cb89ff4af8172720f7457514d981 Mon Sep 17 00:00:00 2001
From: FernandoS27 <fsahmkow27@gmail.com>
Date: Thu, 25 Oct 2018 12:24:10 -0400
Subject: [PATCH] Fixed Block Resizing algorithm and Clang Format

---
 .../renderer_opengl/gl_rasterizer_cache.cpp   |  7 +++---
 .../renderer_opengl/gl_rasterizer_cache.h     | 23 ++++++++++++-------
 .../renderer_opengl/maxwell_to_gl.h           |  1 -
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
index 28f17bc75..cbe5bf664 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
@@ -100,7 +100,7 @@ std::size_t SurfaceParams::InnerMipmapMemorySize(u32 mip_level, bool force_gl, b
     m_width = std::max(1U, m_width >> mip_level);
     m_height = std::max(1U, m_height >> mip_level);
     m_depth = std::max(1U, m_depth >> mip_level);
-    u32 m_block_height = MipBlockHeight(mip_level);
+    u32 m_block_height = MipBlockHeight(mip_level, m_height);
     u32 m_block_depth = MipBlockDepth(mip_level);
     return Tegra::Texture::CalculateSize(force_gl ? false : is_tiled, bytes_per_pixel, m_width,
                                          m_height, m_depth, m_block_height, m_block_depth);
@@ -875,6 +875,9 @@ CachedSurface::CachedSurface(const SurfaceParams& params)
     glTexParameteri(SurfaceTargetToGL(params.target), GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(SurfaceTargetToGL(params.target), GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(SurfaceTargetToGL(params.target), GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    if (params.max_mip_level == 1) {
+        glTexParameterf(SurfaceTargetToGL(params.target), GL_TEXTURE_LOD_BIAS, 1000.0);
+    }
 
     VideoCore::LabelGLObject(GL_TEXTURE, texture.handle, params.addr,
                              SurfaceParams::SurfaceTargetName(params.target));
@@ -1325,8 +1328,6 @@ void RasterizerCacheOpenGL::AccurateCopySurface(const Surface& src_surface,
                                                 const Surface& dst_surface) {
     const auto& src_params{src_surface->GetSurfaceParams()};
     const auto& dst_params{dst_surface->GetSurfaceParams()};
-    auto* start = Memory::GetPointer(src_params.addr);
-    std::fill(start, start + dst_params.MemorySize(), 0);
     FlushRegion(src_params.addr, dst_params.MemorySize());
     LoadSurface(dst_surface);
 }
diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.h b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
index 68479d55a..951e03ba6 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
@@ -915,21 +915,28 @@ struct SurfaceParams {
         return std::max(1U, depth >> mip_level);
     }
 
-    u32 MipBlockHeight(u32 mip_level) const {
-        u32 height = MipHeight(mip_level);
-        u32 bh = block_height;
-        // Magical block resizing algorithm, needs more testing.
-        while (bh > 1 && (height +  bh - 1) / bh <= 16) {
-            bh = bh >> 1;
+    // Auto block resizing algorithm from:
+    // https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/nouveau/nv50/nv50_miptree.c
+    u32 MipBlockHeight(u32 mip_level, u32 alt_height = 0) const {
+        if (mip_level == 0)
+            return block_height;
+        if (alt_height == 0)
+            alt_height = MipHeight(mip_level);
+        u32 blocks_in_y = (alt_height + 7) / 8;
+        u32 bh = 32;
+        while (bh > 1 && blocks_in_y <= bh * 2) {
+            bh >>= 1;
         }
         return bh;
     }
 
     u32 MipBlockDepth(u32 mip_level) const {
+        if (mip_level == 0)
+            return block_depth;
         u32 depth = MipDepth(mip_level);
-        u32 bd = block_depth;
+        u32 bd = 32;
         // Magical block resizing algorithm, needs more testing.
-        while (bd > 1 && depth / bd <= 16) {
+        while (bd > 1 && depth / depth <= bd) {
             bd = bd >> 1;
         }
         return bd;
diff --git a/src/video_core/renderer_opengl/maxwell_to_gl.h b/src/video_core/renderer_opengl/maxwell_to_gl.h
index 76c3b65bd..87d511c38 100644
--- a/src/video_core/renderer_opengl/maxwell_to_gl.h
+++ b/src/video_core/renderer_opengl/maxwell_to_gl.h
@@ -165,7 +165,6 @@ inline GLenum TextureFilterMode(Tegra::Texture::TextureFilter filter_mode,
     return {};
 }
 
-
 inline GLenum WrapMode(Tegra::Texture::WrapMode wrap_mode) {
     switch (wrap_mode) {
     case Tegra::Texture::WrapMode::Wrap: