From fb6cf12a17daf1f452d9c542e22c9252bbfb5c76 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Thu, 28 Nov 2019 22:59:09 -0300
Subject: [PATCH] gl_framebuffer_cache: Optimize framebuffer key
Pack color attachment enumerations into a single u32. To determine the
number of buffers, the highest color attachment with a shared pointer
that doesn't point to null is used.
---
.../renderer_opengl/gl_framebuffer_cache.cpp | 63 ++++++++++++-------
.../renderer_opengl/gl_framebuffer_cache.h | 19 +++---
.../renderer_opengl/gl_rasterizer.cpp | 30 ++++-----
3 files changed, 63 insertions(+), 49 deletions(-)
diff --git a/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp b/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp
index a5d69d78df..874ed3c6e7 100644
--- a/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_framebuffer_cache.cpp
@@ -3,9 +3,12 @@
// Refer to the license.txt file included.
#include <tuple>
+#include <unordered_map>
+#include <utility>
-#include "common/cityhash.h"
-#include "common/scope_exit.h"
+#include <glad/glad.h>
+
+#include "common/common_types.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/renderer_opengl/gl_framebuffer_cache.h"
#include "video_core/renderer_opengl/gl_state.h"
@@ -13,6 +16,7 @@
namespace OpenGL {
using Maxwell = Tegra::Engines::Maxwell3D::Regs;
+using VideoCore::Surface::SurfaceType;
FramebufferCacheOpenGL::FramebufferCacheOpenGL() = default;
@@ -35,36 +39,49 @@ OGLFramebuffer FramebufferCacheOpenGL::CreateFramebuffer(const FramebufferCacheK
local_state.draw.draw_framebuffer = framebuffer.handle;
local_state.ApplyFramebufferState();
- for (std::size_t index = 0; index < Maxwell::NumRenderTargets; ++index) {
- if (key.colors[index]) {
- key.colors[index]->Attach(GL_COLOR_ATTACHMENT0 + static_cast<GLenum>(index),
- GL_DRAW_FRAMEBUFFER);
- }
- }
- if (key.colors_count) {
- glDrawBuffers(key.colors_count, key.color_attachments.data());
- } else {
- glDrawBuffer(GL_NONE);
+ if (key.zeta) {
+ const bool stencil = key.zeta->GetSurfaceParams().type == SurfaceType::DepthStencil;
+ const GLenum attach_target = stencil ? GL_DEPTH_STENCIL_ATTACHMENT : GL_DEPTH_ATTACHMENT;
+ key.zeta->Attach(attach_target, GL_DRAW_FRAMEBUFFER);
}
- if (key.zeta) {
- key.zeta->Attach(key.stencil_enable ? GL_DEPTH_STENCIL_ATTACHMENT : GL_DEPTH_ATTACHMENT,
- GL_DRAW_FRAMEBUFFER);
+ std::size_t num_buffers = 0;
+ std::array<GLenum, Maxwell::NumRenderTargets> targets;
+
+ for (std::size_t index = 0; index < Maxwell::NumRenderTargets; ++index) {
+ if (!key.colors[index]) {
+ targets[index] = GL_NONE;
+ continue;
+ }
+ const GLenum attach_target = GL_COLOR_ATTACHMENT0 + static_cast<GLenum>(index);
+ key.colors[index]->Attach(attach_target, GL_DRAW_FRAMEBUFFER);
+
+ const u32 attachment = (key.color_attachments >> (BitsPerAttachment * index)) & 0b1111;
+ targets[index] = GL_COLOR_ATTACHMENT0 + attachment;
+ num_buffers = index + 1;
+ }
+
+ if (num_buffers > 0) {
+ glDrawBuffers(static_cast<GLsizei>(num_buffers), std::data(targets));
+ } else {
+ glDrawBuffer(GL_NONE);
}
return framebuffer;
}
-std::size_t FramebufferCacheKey::Hash() const {
- static_assert(sizeof(*this) % sizeof(u64) == 0, "Unaligned struct");
- return static_cast<std::size_t>(
- Common::CityHash64(reinterpret_cast<const char*>(this), sizeof(*this)));
+std::size_t FramebufferCacheKey::Hash() const noexcept {
+ std::size_t hash = std::hash<View>{}(zeta);
+ for (const auto& color : colors) {
+ hash ^= std::hash<View>{}(color);
+ }
+ hash ^= static_cast<std::size_t>(color_attachments) << 16;
+ return hash;
}
-bool FramebufferCacheKey::operator==(const FramebufferCacheKey& rhs) const {
- return std::tie(stencil_enable, colors_count, color_attachments, colors, zeta) ==
- std::tie(rhs.stencil_enable, rhs.colors_count, rhs.color_attachments, rhs.colors,
- rhs.zeta);
+bool FramebufferCacheKey::operator==(const FramebufferCacheKey& rhs) const noexcept {
+ return std::tie(colors, zeta, color_attachments) ==
+ std::tie(rhs.colors, rhs.zeta, rhs.color_attachments);
}
} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_framebuffer_cache.h b/src/video_core/renderer_opengl/gl_framebuffer_cache.h
index 3b5ff2149c..02ec80ae9a 100644
--- a/src/video_core/renderer_opengl/gl_framebuffer_cache.h
+++ b/src/video_core/renderer_opengl/gl_framebuffer_cache.h
@@ -18,21 +18,24 @@
namespace OpenGL {
-struct alignas(sizeof(u64)) FramebufferCacheKey {
- bool stencil_enable;
- u16 colors_count;
+constexpr std::size_t BitsPerAttachment = 4;
- std::array<GLenum, Tegra::Engines::Maxwell3D::Regs::NumRenderTargets> color_attachments{};
- std::array<View, Tegra::Engines::Maxwell3D::Regs::NumRenderTargets> colors;
+struct FramebufferCacheKey {
View zeta;
+ std::array<View, Tegra::Engines::Maxwell3D::Regs::NumRenderTargets> colors;
+ u32 color_attachments = 0;
- std::size_t Hash() const;
+ std::size_t Hash() const noexcept;
- bool operator==(const FramebufferCacheKey& rhs) const;
+ bool operator==(const FramebufferCacheKey& rhs) const noexcept;
- bool operator!=(const FramebufferCacheKey& rhs) const {
+ bool operator!=(const FramebufferCacheKey& rhs) const noexcept {
return !operator==(rhs);
}
+
+ void SetAttachment(std::size_t index, u32 attachment) {
+ color_attachments |= attachment << (BitsPerAttachment * index);
+ }
};
} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 18c1222289..9eef7fcd28 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -372,33 +372,31 @@ void RasterizerOpenGL::ConfigureFramebuffers() {
UNIMPLEMENTED_IF(regs.rt_separate_frag_data == 0);
// Bind the framebuffer surfaces
- FramebufferCacheKey fbkey;
- for (std::size_t index = 0; index < Maxwell::NumRenderTargets; ++index) {
+ FramebufferCacheKey key;
+ const auto colors_count = static_cast<std::size_t>(regs.rt_control.count);
+ for (std::size_t index = 0; index < colors_count; ++index) {
View color_surface{texture_cache.GetColorBufferSurface(index, true)};
-
- if (color_surface) {
- // Assume that a surface will be written to if it is used as a framebuffer, even
- // if the shader doesn't actually write to it.
- texture_cache.MarkColorBufferInUse(index);
+ if (!color_surface) {
+ continue;
}
+ // Assume that a surface will be written to if it is used as a framebuffer, even
+ // if the shader doesn't actually write to it.
+ texture_cache.MarkColorBufferInUse(index);
- fbkey.color_attachments[index] = GL_COLOR_ATTACHMENT0 + regs.rt_control.GetMap(index);
- fbkey.colors[index] = std::move(color_surface);
+ key.SetAttachment(index, regs.rt_control.GetMap(index));
+ key.colors[index] = std::move(color_surface);
}
- fbkey.colors_count = static_cast<u16>(regs.rt_control.count);
if (depth_surface) {
// Assume that a surface will be written to if it is used as a framebuffer, even if
// the shader doesn't actually write to it.
texture_cache.MarkDepthBufferInUse();
-
- fbkey.stencil_enable = depth_surface->GetSurfaceParams().type == SurfaceType::DepthStencil;
- fbkey.zeta = std::move(depth_surface);
+ key.zeta = std::move(depth_surface);
}
texture_cache.GuardRenderTargets(false);
- state.draw.draw_framebuffer = framebuffer_cache.GetFramebuffer(fbkey);
+ state.draw.draw_framebuffer = framebuffer_cache.GetFramebuffer(key);
SyncViewport(state);
}
@@ -421,12 +419,8 @@ void RasterizerOpenGL::ConfigureClearFramebuffer(OpenGLState& current_state, boo
texture_cache.GuardRenderTargets(false);
FramebufferCacheKey key;
- key.colors_count = color_surface ? 1 : 0;
key.colors[0] = color_surface;
- key.color_attachments[0] = GL_COLOR_ATTACHMENT0;
key.zeta = depth_surface;
- key.stencil_enable = depth_surface && depth_surface->GetSurfaceParams().type ==
- VideoCore::Surface::SurfaceType::DepthStencil;
current_state.draw.draw_framebuffer = framebuffer_cache.GetFramebuffer(key);
current_state.ApplyFramebufferState();