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14-shadowvolumes: Use transient instead of static buffers. (#3753)

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This commit is contained in:
Branimir Karadžić
2026-06-12 23:30:28 -07:00
committed by GitHub
parent 5abee1a283
commit e3bf3206b9
1 changed files with 37 additions and 32 deletions
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69
examples/14-shadowvolumes/shadowvolumes.cpp
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@@ -1111,10 +1111,10 @@ struct ShadowVolumeAlgorithm
struct ShadowVolume
{
bgfx::VertexBufferHandle m_vbSides;
bgfx::IndexBufferHandle m_ibSides;
bgfx::IndexBufferHandle m_ibFrontCap;
bgfx::IndexBufferHandle m_ibBackCap;
bgfx::TransientVertexBuffer m_vbSides;
bgfx::TransientIndexBuffer m_ibSides;
bgfx::TransientIndexBuffer m_ibFrontCap;
bgfx::TransientIndexBuffer m_ibBackCap;
uint32_t m_numVertices;
uint32_t m_numIndices;
@@ -1123,6 +1123,7 @@ struct ShadowVolume
const float* m_lightPos;
bool m_cap;
bool m_valid;
};
void shadowVolumeLightTransform(
@@ -1494,40 +1495,38 @@ void shadowVolumeCreate(
_outShadowVolume.m_lightPos = _light;
_outShadowVolume.m_cap = cap;
const bgfx::Memory* mem;
//sides
uint32_t vsize = vsideI * 5*sizeof(float);
uint32_t isize = sideI * sizeof(uint16_t);
mem = bgfx::makeRef(verticesSide, vsize);
_outShadowVolume.m_vbSides = bgfx::createVertexBuffer(mem, layout);
const uint32_t numIndices = sideI + (cap ? frontCapI + backCapI : 0);
_outShadowVolume.m_valid = true
&& vsideI == bgfx::getAvailTransientVertexBuffer(vsideI, layout)
&& numIndices == bgfx::getAvailTransientIndexBuffer(numIndices)
;
mem = bgfx::makeRef(indicesSide, isize);
_outShadowVolume.m_ibSides = bgfx::createIndexBuffer(mem);
if (!_outShadowVolume.m_valid)
{
return;
}
// bgfx::destroy*Buffer doesn't actually destroy buffers now.
// Instead, these bgfx::destroy*Buffer commands get queued to be executed after the end of the next frame.
bgfx::destroy(_outShadowVolume.m_vbSides);
bgfx::destroy(_outShadowVolume.m_ibSides);
bgfx::allocTransientVertexBuffer(&_outShadowVolume.m_vbSides, vsideI, layout);
bx::memCopy(_outShadowVolume.m_vbSides.data, verticesSide, vsize);
bgfx::allocTransientIndexBuffer(&_outShadowVolume.m_ibSides, sideI);
bx::memCopy(_outShadowVolume.m_ibSides.data, indicesSide, isize);
if (cap)
{
//front cap
isize = frontCapI * sizeof(uint16_t);
mem = bgfx::makeRef(indicesFrontCap, isize);
_outShadowVolume.m_ibFrontCap = bgfx::createIndexBuffer(mem);
//gets destroyed after the end of the next frame
bgfx::destroy(_outShadowVolume.m_ibFrontCap);
bgfx::allocTransientIndexBuffer(&_outShadowVolume.m_ibFrontCap, frontCapI);
bx::memCopy(_outShadowVolume.m_ibFrontCap.data, indicesFrontCap, isize);
//back cap
isize = backCapI * sizeof(uint16_t);
mem = bgfx::makeRef(indicesBackCap, isize);
_outShadowVolume.m_ibBackCap = bgfx::createIndexBuffer(mem);
//gets destroyed after the end of the next frame
bgfx::destroy(_outShadowVolume.m_ibBackCap);
bgfx::allocTransientIndexBuffer(&_outShadowVolume.m_ibBackCap, backCapI);
bx::memCopy(_outShadowVolume.m_ibBackCap.data, indicesBackCap, isize);
}
}
@@ -2554,6 +2553,12 @@ public:
m_numShadowVolumeVertices += shadowVolume.m_numVertices;
m_numShadowVolumeIndices += shadowVolume.m_numIndices;
if (!shadowVolume.m_valid)
{
// Geometry didn't fit the per-frame transient budget; skip it.
continue;
}
ShadowVolumeProgramType::Enum programIndex = ShadowVolumeProgramType::Blank;
RenderState::Enum renderStateIndex;
if (m_useStencilTexture)
@@ -2579,8 +2584,8 @@ public:
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, shadowVolume.m_vbSides);
bgfx::setIndexBuffer(shadowVolume.m_ibSides);
bgfx::setVertexBuffer(0, &shadowVolume.m_vbSides);
bgfx::setIndexBuffer(&shadowVolume.m_ibSides);
setRenderState(renderStateCraftStencil);
::submit(viewId, m_svProgs[programIndex][ShadowVolumePart::Side]);
@@ -2589,14 +2594,14 @@ public:
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, group.m_vbh);
bgfx::setIndexBuffer(shadowVolume.m_ibFrontCap);
bgfx::setIndexBuffer(&shadowVolume.m_ibFrontCap);
setRenderState(renderStateCraftStencil);
::submit(viewId, m_svProgs[programIndex][ShadowVolumePart::Front]);
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, group.m_vbh);
bgfx::setIndexBuffer(shadowVolume.m_ibBackCap);
bgfx::setIndexBuffer(&shadowVolume.m_ibBackCap);
::setRenderState(renderStateCraftStencil);
::submit(viewId, m_svProgs[programIndex][ShadowVolumePart::Back]);
}
@@ -2607,8 +2612,8 @@ public:
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, shadowVolume.m_vbSides);
bgfx::setIndexBuffer(shadowVolume.m_ibSides);
bgfx::setVertexBuffer(0, &shadowVolume.m_vbSides);
bgfx::setIndexBuffer(&shadowVolume.m_ibSides);
::setRenderState(renderState);
::submit(kRange1Pass3, m_svProgs[ShadowVolumeProgramType::Color][ShadowVolumePart::Side]);
@@ -2617,14 +2622,14 @@ public:
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, group.m_vbh);
bgfx::setIndexBuffer(shadowVolume.m_ibFrontCap);
bgfx::setIndexBuffer(&shadowVolume.m_ibFrontCap);
::setRenderState(renderState);
::submit(kRange1Pass3, m_svProgs[ShadowVolumeProgramType::Color][ShadowVolumePart::Front]);
s_uniforms.submitPerDrawUniforms();
bgfx::setTransform(shadowVolumeMtx);
bgfx::setVertexBuffer(0, group.m_vbh);
bgfx::setIndexBuffer(shadowVolume.m_ibBackCap);
bgfx::setIndexBuffer(&shadowVolume.m_ibBackCap);
::setRenderState(renderState);
::submit(kRange1Pass3, m_svProgs[ShadowVolumeProgramType::Color][ShadowVolumePart::Back]);
}