gl_rasterizer: implement mipmap

src/video_core/regs_texturing.h

@@ -59,11 +59,16 @@ struct TexturingRegs {
             BitField<2, 1, TextureFilter> min_filter;
             BitField<8, 3, WrapMode> wrap_t;
             BitField<12, 3, WrapMode> wrap_s;
+            BitField<24, 1, TextureFilter> mip_filter;
             /// @note Only valid for texture 0 according to 3DBrew.
             BitField<28, 3, TextureType> type;
         };
 
-        INSERT_PADDING_WORDS(0x1);
+        union {
+            BitField<0, 13, s32> bias; // fixed1.4.8
+            BitField<16, 4, u32> max_level;
+            BitField<24, 4, u32> min_level;
+        } lod;
 
         BitField<0, 28, u32> address;
 

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1555,13 +1555,16 @@ bool RasterizerOpenGL::AccelerateDisplay(const GPU::Regs::FramebufferConfig& con
 
 void RasterizerOpenGL::SamplerInfo::Create() {
     sampler.Create();
-    mag_filter = min_filter = TextureConfig::Linear;
+    mag_filter = min_filter = mip_filter = TextureConfig::Linear;
     wrap_s = wrap_t = TextureConfig::Repeat;
     border_color = 0;
+    lod_min = lod_max = 0;
+    lod_bias = 0;
 
-    // default is GL_LINEAR_MIPMAP_LINEAR
+    // default is 1000 and -1000
-    glSamplerParameteri(sampler.handle, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     // Other attributes have correct defaults
+    glSamplerParameterf(sampler.handle, GL_TEXTURE_MAX_LOD, lod_max);
+    glSamplerParameterf(sampler.handle, GL_TEXTURE_MIN_LOD, lod_min);
 }
 
 void RasterizerOpenGL::SamplerInfo::SyncWithConfig(
@@ -1571,11 +1574,13 @@ void RasterizerOpenGL::SamplerInfo::SyncWithConfig(
 
     if (mag_filter != config.mag_filter) {
         mag_filter = config.mag_filter;
-        glSamplerParameteri(s, GL_TEXTURE_MAG_FILTER, PicaToGL::TextureFilterMode(mag_filter));
+        glSamplerParameteri(s, GL_TEXTURE_MAG_FILTER, PicaToGL::TextureMagFilterMode(mag_filter));
     }
-    if (min_filter != config.min_filter) {
+    if (min_filter != config.min_filter || mip_filter != config.mip_filter) {
         min_filter = config.min_filter;
-        glSamplerParameteri(s, GL_TEXTURE_MIN_FILTER, PicaToGL::TextureFilterMode(min_filter));
+        mip_filter = config.mip_filter;
+        glSamplerParameteri(s, GL_TEXTURE_MIN_FILTER,
+                            PicaToGL::TextureMinFilterMode(min_filter, mip_filter));
     }
 
     if (wrap_s != config.wrap_s) {
@@ -1594,6 +1599,21 @@ void RasterizerOpenGL::SamplerInfo::SyncWithConfig(
             glSamplerParameterfv(s, GL_TEXTURE_BORDER_COLOR, gl_color.data());
         }
     }
+
+    if (lod_min != config.lod.min_level) {
+        lod_min = config.lod.min_level;
+        glSamplerParameterf(s, GL_TEXTURE_MIN_LOD, lod_min);
+    }
+
+    if (lod_max != config.lod.max_level) {
+        lod_max = config.lod.max_level;
+        glSamplerParameterf(s, GL_TEXTURE_MAX_LOD, lod_max);
+    }
+
+    if (lod_bias != config.lod.bias) {
+        lod_bias = config.lod.bias;
+        glSamplerParameterf(s, GL_TEXTURE_LOD_BIAS, lod_bias / 256.0f);
+    }
 }
 
 void RasterizerOpenGL::SetShader() {

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -69,9 +69,13 @@ private:
     private:
         TextureConfig::TextureFilter mag_filter;
         TextureConfig::TextureFilter min_filter;
+        TextureConfig::TextureFilter mip_filter;
         TextureConfig::WrapMode wrap_s;
         TextureConfig::WrapMode wrap_t;
         u32 border_color;
+        u32 lod_min;
+        u32 lod_max;
+        s32 lod_bias;
     };
 
     /// Structure that the hardware rendered vertices are composed of

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -1326,10 +1326,11 @@ Surface RasterizerCacheOpenGL::GetTextureSurface(
     const Pica::TexturingRegs::FullTextureConfig& config) {
     Pica::Texture::TextureInfo info =
         Pica::Texture::TextureInfo::FromPicaRegister(config.config, config.format);
-    return GetTextureSurface(info);
+    return GetTextureSurface(info, config.config.lod.max_level);
 }
 
-Surface RasterizerCacheOpenGL::GetTextureSurface(const Pica::Texture::TextureInfo& info) {
+Surface RasterizerCacheOpenGL::GetTextureSurface(const Pica::Texture::TextureInfo& info,
+                                                 u32 max_level) {
     SurfaceParams params;
     params.addr = info.physical_address;
     params.width = info.width;
@@ -1338,23 +1339,97 @@ Surface RasterizerCacheOpenGL::GetTextureSurface(const Pica::Texture::TextureInf
     params.pixel_format = SurfaceParams::PixelFormatFromTextureFormat(info.format);
     params.UpdateParams();
 
-    if (info.width % 8 != 0 || info.height % 8 != 0) {
+    u32 min_width = info.width >> max_level;
-        Surface src_surface;
+    u32 min_height = info.height >> max_level;
-        Common::Rectangle<u32> rect;
+    if (min_width % 8 != 0 || min_height % 8 != 0) {
-        std::tie(src_surface, rect) = GetSurfaceSubRect(params, ScaleMatch::Ignore, true);
+        LOG_CRITICAL(Render_OpenGL, "Texture size ({}x{}) is not multiple of 8", min_width,
-
+                     min_height);
-        params.res_scale = src_surface->res_scale;
+        return nullptr;
-        Surface tmp_surface = CreateSurface(params);
+    }
-        BlitTextures(src_surface->texture.handle, rect, tmp_surface->texture.handle,
+    if (info.width != (min_width << max_level) || info.height != (min_height << max_level)) {
-                     tmp_surface->GetScaledRect(),
+        LOG_CRITICAL(Render_OpenGL,
-                     SurfaceParams::GetFormatType(params.pixel_format), read_framebuffer.handle,
+                     "Texture size ({}x{}) does not support required mipmap level ({})",
-                     draw_framebuffer.handle);
+                     params.width, params.height, max_level);
-
+        return nullptr;
-        remove_surfaces.emplace(tmp_surface);
-        return tmp_surface;
     }
 
-    return GetSurface(params, ScaleMatch::Ignore, true);
+    auto surface = GetSurface(params, ScaleMatch::Ignore, true);
+
+    // Update mipmap if necessary
+    if (max_level != 0) {
+        if (max_level >= 8) {
+            // since PICA only supports texture size between 8 and 1024, there are at most eight
+            // possible mipmap levels including the base.
+            LOG_CRITICAL(Render_OpenGL, "Unsupported mipmap level {}", max_level);
+            return nullptr;
+        }
+        OpenGLState prev_state = OpenGLState::GetCurState();
+        OpenGLState state;
+        SCOPE_EXIT({ prev_state.Apply(); });
+        auto format_tuple = GetFormatTuple(params.pixel_format);
+
+        // Allocate more mipmap level if necessary
+        if (surface->max_level < max_level) {
+            state.texture_units[0].texture_2d = surface->texture.handle;
+            state.Apply();
+            glActiveTexture(GL_TEXTURE0);
+            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, max_level);
+            u32 width = surface->width * surface->res_scale;
+            u32 height = surface->height * surface->res_scale;
+            for (u32 level = surface->max_level + 1; level <= max_level; ++level) {
+                glTexImage2D(GL_TEXTURE_2D, level, format_tuple.internal_format, width >> level,
+                             height >> level, 0, format_tuple.format, format_tuple.type, nullptr);
+            }
+            surface->max_level = max_level;
+        }
+
+        // Blit mipmaps that have been invalidated
+        state.draw.read_framebuffer = read_framebuffer.handle;
+        state.draw.draw_framebuffer = draw_framebuffer.handle;
+        state.ResetTexture(surface->texture.handle);
+        SurfaceParams params = *surface;
+        for (u32 level = 1; level <= max_level; ++level) {
+            // In PICA all mipmap levels are stored next to each other
+            params.addr += params.width * params.height * params.GetFormatBpp() / 8;
+            params.width /= 2;
+            params.height /= 2;
+            params.stride = 0; // reset stride and let UpdateParams re-initialize it
+            params.UpdateParams();
+            auto& watcher = surface->level_watchers[level - 1];
+            if (!watcher || !watcher->Get()) {
+                auto level_surface = GetSurface(params, ScaleMatch::Ignore, true);
+                if (level_surface) {
+                    watcher = level_surface->CreateWatcher();
+                } else {
+                    watcher = nullptr;
+                }
+            }
+
+            if (watcher && !watcher->IsValid()) {
+                auto level_surface = watcher->Get();
+                state.ResetTexture(level_surface->texture.handle);
+                state.Apply();
+                glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                                       level_surface->texture.handle, 0);
+                glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
+                                       GL_TEXTURE_2D, 0, 0);
+
+                glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                                       surface->texture.handle, level);
+                glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
+                                       GL_TEXTURE_2D, 0, 0);
+
+                auto src_rect = level_surface->GetScaledRect();
+                auto dst_rect = params.GetScaledRect();
+                glBlitFramebuffer(src_rect.left, src_rect.bottom, src_rect.right, src_rect.top,
+                                  dst_rect.left, dst_rect.bottom, dst_rect.right, dst_rect.top,
+                                  GL_COLOR_BUFFER_BIT, GL_LINEAR);
+                watcher->Validate();
+            }
+        }
+    }
+
+    return surface;
 }
 
 const CachedTextureCube& RasterizerCacheOpenGL::GetTextureCube(const TextureCubeConfig& config) {

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -356,6 +356,11 @@ struct CachedSurface : SurfaceParams, std::enable_shared_from_this<CachedSurface
 
     OGLTexture texture;
 
+    /// max mipmap level that has been attached to the texture
+    u32 max_level = 0;
+    /// level_watchers[i] watches the (i+1)-th level mipmap source surface
+    std::array<std::shared_ptr<SurfaceWatcher>, 7> level_watchers;
+
     static constexpr unsigned int GetGLBytesPerPixel(PixelFormat format) {
         // OpenGL needs 4 bpp alignment for D24 since using GL_UNSIGNED_INT as type
         return format == PixelFormat::Invalid
@@ -434,7 +439,7 @@ public:
 
     /// Get a surface based on the texture configuration
     Surface GetTextureSurface(const Pica::TexturingRegs::FullTextureConfig& config);
-    Surface GetTextureSurface(const Pica::Texture::TextureInfo& info);
+    Surface GetTextureSurface(const Pica::Texture::TextureInfo& info, u32 max_level = 0);
 
     /// Get a texture cube based on the texture configuration
     const CachedTextureCube& GetTextureCube(const TextureCubeConfig& config);

src/video_core/renderer_opengl/pica_to_gl.h

@@ -29,33 +29,40 @@ using GLivec4 = std::array<GLint, 4>;
 
 namespace PicaToGL {
 
-inline GLenum TextureFilterMode(Pica::TexturingRegs::TextureConfig::TextureFilter mode) {
+using TextureFilter = Pica::TexturingRegs::TextureConfig::TextureFilter;
-    static constexpr std::array<GLenum, 2> filter_mode_table{{
-        GL_NEAREST, // TextureFilter::Nearest
-        GL_LINEAR,  // TextureFilter::Linear
-    }};
-
-    const auto index = static_cast<std::size_t>(mode);
-
-    // Range check table for input
-    if (index >= filter_mode_table.size()) {
-        LOG_CRITICAL(Render_OpenGL, "Unknown texture filtering mode {}", index);
-        UNREACHABLE();
 
+inline GLenum TextureMagFilterMode(TextureFilter mode) {
+    if (mode == TextureFilter::Linear) {
         return GL_LINEAR;
     }
-
+    if (mode == TextureFilter::Nearest) {
-    GLenum gl_mode = filter_mode_table[index];
+        return GL_NEAREST;
-
-    // Check for dummy values indicating an unknown mode
-    if (gl_mode == 0) {
-        LOG_CRITICAL(Render_OpenGL, "Unknown texture filtering mode {}", index);
-        UNIMPLEMENTED();
-
-        return GL_LINEAR;
     }
+    LOG_CRITICAL(Render_OpenGL, "Unknown texture filtering mode {}", static_cast<u32>(mode));
+    UNIMPLEMENTED();
+    return GL_LINEAR;
+}
 
-    return gl_mode;
+inline GLenum TextureMinFilterMode(TextureFilter min, TextureFilter mip) {
+    if (min == TextureFilter::Linear) {
+        if (mip == TextureFilter::Linear) {
+            return GL_LINEAR_MIPMAP_LINEAR;
+        }
+        if (mip == TextureFilter::Nearest) {
+            return GL_LINEAR_MIPMAP_NEAREST;
+        }
+    } else if (min == TextureFilter::Nearest) {
+        if (mip == TextureFilter::Linear) {
+            return GL_NEAREST_MIPMAP_LINEAR;
+        }
+        if (mip == TextureFilter::Nearest) {
+            return GL_NEAREST_MIPMAP_NEAREST;
+        }
+    }
+    LOG_CRITICAL(Render_OpenGL, "Unknown texture filtering mode {} and {}", static_cast<u32>(min),
+                 static_cast<u32>(mip));
+    UNIMPLEMENTED();
+    return GL_LINEAR_MIPMAP_LINEAR;
 }
 
 inline GLenum WrapMode(Pica::TexturingRegs::TextureConfig::WrapMode mode) {