-
Notifications
You must be signed in to change notification settings - Fork 12
Expand file tree
/
Copy pathTiledLighting.cpp
More file actions
186 lines (148 loc) · 6.2 KB
/
TiledLighting.cpp
File metadata and controls
186 lines (148 loc) · 6.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
#include "TiledLighting.hpp"
#include "fg/FrameGraph.hpp"
#include "fg/Blackboard.hpp"
#include "FrameGraphHelper.hpp"
#include "FrameGraphTexture.hpp"
#include "FrameGraphBuffer.hpp"
#include "FrameData.hpp"
#include "GBufferData.hpp"
#include "LightsData.hpp"
#include "LightCullingData.hpp"
#include "ShaderCodeBuilder.hpp"
#include "tracy/TracyOpenGL.hpp"
namespace {
constexpr auto kUseDebugOutput = true;
struct GPUFrustumTile {
glm::vec4 planes[4];
};
static_assert(sizeof(GPUFrustumTile) == 64);
} // namespace
//
// TiledLighting class:
//
TiledLighting::TiledLighting(RenderContext &rc, uint32_t tileSize)
: m_renderContext{rc}, m_tileSize{tileSize} {
_setupPipelines();
}
TiledLighting::~TiledLighting() {
glDeleteProgram(m_buildFrustumsProgram);
glDeleteProgram(m_cullLightsProgram);
}
void TiledLighting::cullLights(FrameGraph &fg,
FrameGraphBlackboard &blackboard) {
const auto &gBuffer = blackboard.get<GBufferData>();
const auto extent = fg.getDescriptor<FrameGraphTexture>(gBuffer.depth).extent;
const auto f = static_cast<float>(m_tileSize);
const auto numGroups = glm::ceil(glm::vec2{extent.width, extent.height} / f);
const auto numFrustums = static_cast<uint32_t>(numGroups.x * numGroups.y);
const auto gridFrustums =
_buildFrustums(fg, blackboard, numFrustums, glm::ceil(numGroups / f));
_cullLights(fg, blackboard, gridFrustums, numFrustums, numGroups);
}
void TiledLighting::_setupPipelines() {
ShaderCodeBuilder shaderCodeBuilder;
shaderCodeBuilder.addDefine("TILE_SIZE", m_tileSize);
m_buildFrustumsProgram = m_renderContext.createComputeProgram(
shaderCodeBuilder.build("LightCulling/BuildFrustums.comp"));
m_cullLightsProgram = m_renderContext.createComputeProgram(
shaderCodeBuilder
// 0 = Disabled, 1 = Heatmap, 2 = Depth
.addDefine("_DEBUG_OUTPUT", kUseDebugOutput ? 1 : 0)
.build("LightCulling/CullLights.comp"));
}
FrameGraphResource
TiledLighting::_buildFrustums(FrameGraph &fg, FrameGraphBlackboard &blackboard,
uint32_t numFrustums, glm::uvec2 numGroups) {
const auto [frameBlock] = blackboard.get<FrameData>();
struct FrustumsData {
FrameGraphResource gridFrustums;
};
auto &pass = fg.addCallbackPass<FrustumsData>(
"BuildFrustums",
[&](FrameGraph::Builder &builder, FrustumsData &data) {
builder.read(frameBlock);
const auto bufferSize =
static_cast<GLsizeiptr>(sizeof(GPUFrustumTile) * numFrustums);
data.gridFrustums =
builder.create<FrameGraphBuffer>("GridFrustums", {.size = bufferSize});
data.gridFrustums = builder.write(data.gridFrustums);
},
[=, this](const FrustumsData &data, FrameGraphPassResources &resources,
void *ctx) {
NAMED_DEBUG_MARKER("BuildFrustums");
TracyGpuZone("BuildFrustums");
static_cast<RenderContext *>(ctx)
->bindUniformBuffer(0, getBuffer(resources, frameBlock))
.bindStorageBuffer(0, getBuffer(resources, data.gridFrustums))
.dispatch(m_buildFrustumsProgram, {numGroups, 1u});
});
return pass.gridFrustums;
}
void TiledLighting::_cullLights(FrameGraph &fg,
FrameGraphBlackboard &blackboard,
FrameGraphResource gridFrustums,
uint32_t numFrustums, glm::uvec2 numThreads) {
const auto [frameBlock] = blackboard.get<FrameData>();
const auto &gBuffer = blackboard.get<GBufferData>();
const auto lightBuffer = blackboard.get<LightsData>().buffer;
struct Data {
FrameGraphResource lightsCounter;
FrameGraphResource lightIndices;
FrameGraphResource lightGrid;
std::optional<FrameGraphResource> debugMap;
};
auto &pass = fg.addCallbackPass<Data>(
"CullLights",
[&](FrameGraph::Builder &builder, Data &data) {
builder.read(frameBlock);
builder.read(gridFrustums);
builder.read(gBuffer.depth);
builder.read(lightBuffer);
data.lightsCounter = builder.create<FrameGraphBuffer>(
"LightsCounter", {.size = sizeof(glm::uvec2)});
data.lightsCounter = builder.write(data.lightsCounter);
data.lightGrid = builder.create<FrameGraphTexture>(
"LightGrid", {
.extent = {numThreads.x, numThreads.y},
.format = PixelFormat::RGBA32UI,
});
data.lightGrid = builder.write(data.lightGrid);
const auto averageOverlappingLightsPerTile = m_tileSize * m_tileSize;
const auto bufferSize = static_cast<GLsizeiptr>(
sizeof(glm::uvec2) * numFrustums * averageOverlappingLightsPerTile);
data.lightIndices =
builder.create<FrameGraphBuffer>("LightIndices", {.size = bufferSize});
data.lightIndices = builder.write(data.lightIndices);
if constexpr (kUseDebugOutput) {
const auto extent =
fg.getDescriptor<FrameGraphTexture>(gBuffer.depth).extent;
data.debugMap = builder.create<FrameGraphTexture>(
"DebugMap", {.extent = extent, .format = PixelFormat::RGBA8_UNorm});
data.debugMap = builder.write(*data.debugMap);
}
},
[=, this](const Data &data, FrameGraphPassResources &resources, void *ctx) {
NAMED_DEBUG_MARKER("CullLights");
TracyGpuZone("CullLights");
auto &lightsCounterSSBO = getBuffer(resources, data.lightsCounter);
auto &rc = *static_cast<RenderContext *>(ctx);
rc.bindUniformBuffer(0, getBuffer(resources, frameBlock))
.bindStorageBuffer(0, getBuffer(resources, lightBuffer))
.bindStorageBuffer(1, getBuffer(resources, gridFrustums))
//.clear(lightsCounterSSBO)
.bindStorageBuffer(2, lightsCounterSSBO)
.bindStorageBuffer(3, getBuffer(resources, data.lightIndices))
.bindTexture(0, getTexture(resources, gBuffer.depth))
.bindImage(0, getTexture(resources, data.lightGrid), 0, GL_WRITE_ONLY);
if constexpr (kUseDebugOutput) {
rc.bindImage(1, getTexture(resources, *data.debugMap), 0,
GL_WRITE_ONLY);
}
rc.dispatch(m_cullLightsProgram, {numThreads, 1u});
});
blackboard.add<LightCullingData>() = {
.lightIndices = pass.lightIndices,
.lightGrid = pass.lightGrid,
.debugMap = pass.debugMap,
};
}