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[Feat] (Diligent/Drawing): Implement glMultiDrawElements.

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This commit is contained in:
BZLZHH
2025-06-21 04:11:40 +08:00
parent 6992c541af
commit 61ae5e2e34
1 changed files with 60 additions and 3 deletions
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MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp
+60 -3
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@@ -29,7 +29,7 @@ namespace MG_GL::GL {
case GL_FLOAT: return sizeof(float);
case GL_FLOAT_VEC2: return 2 * sizeof(float);
case GL_FLOAT_VEC3: return 3 * sizeof(float);
case GL_FLOAT_VEC4: return 4 * sizeof(float);
case GL_FLOAT_VEC4:
case GL_FLOAT_MAT2: return 4 * sizeof(float);
case GL_FLOAT_MAT3: return 9 * sizeof(float);
case GL_FLOAT_MAT4: return 16 * sizeof(float);
@@ -685,7 +685,64 @@ namespace MG_GL::GL {
}
void MultiDrawElements(GLenum mode, const GLsizei *count, GLenum type, const GLvoid *const *indices, GLsizei drawcount) {
// TODO
PrepareForDraw();
auto* pVAO = MG_State_T::vertexArrayState->GetCurrentVAO();
Diligent::IBuffer* pIndexBuffer = nullptr;
if (pVAO->elementBuffer != 0) {
auto it = MG_Diligent::g_BufferMap.find(pVAO->elementBuffer);
if (it != MG_Diligent::g_BufferMap.end() && it->second) {
pIndexBuffer = it->second;
}
}
if (!pIndexBuffer) {
MG_Util::Debug::LogE("No valid index buffer bound for multi-draw");
return;
}
std::vector<Diligent::MultiDrawIndexedItem> drawItems;
drawItems.reserve(drawcount);
Diligent::VALUE_TYPE indexType = ConvertGLTypeToDiligent(type);
Diligent::Uint32 indexSize = 0;
switch (indexType) {
case Diligent::VT_UINT8: indexSize = 1; break;
case Diligent::VT_UINT16: indexSize = 2; break;
case Diligent::VT_UINT32: indexSize = 4; break;
default:
MG_Util::Debug::LogE("Unsupported index type for multi-draw: %d", type);
return;
}
for (GLsizei i = 0; i < drawcount; i++) {
if (count[i] <= 0) continue;
Diligent::MultiDrawIndexedItem item;
item.NumIndices = static_cast<Diligent::Uint32>(count[i]);
auto byteOffset = reinterpret_cast<Diligent::Uint64>(indices[i]);
item.FirstIndexLocation = static_cast<Diligent::Uint32>(byteOffset / indexSize);
item.BaseVertex = 0; // No base vertex
drawItems.push_back(item);
}
if (drawItems.empty()) {
MG_Util::Debug::LogW("No valid draw items in multi-draw");
return;
}
Diligent::MultiDrawIndexedAttribs drawAttrs;
drawAttrs.DrawCount = static_cast<Diligent::Uint32>(drawItems.size());
drawAttrs.pDrawItems = drawItems.data();
drawAttrs.IndexType = indexType;
drawAttrs.Flags = Diligent::DRAW_FLAG_VERIFY_ALL;
drawAttrs.NumInstances = 1;
drawAttrs.FirstInstanceLocation = 0;
EnsureRenderPassActive();
MG_Diligent::g_pContext->MultiDrawIndexed(drawAttrs);
MG_Diligent::g_pContext->EndRenderPass();
MG_Diligent::IsInRenderPass = false;
MG_Util::Debug::LogD("MultiDrawElements completed.");
}
void MultiDrawElementsBaseVertex(GLenum mode, const GLsizei *count, GLenum type, const GLvoid *const *indices, GLsizei drawcount, const GLint *basevertex) {
@@ -723,7 +780,7 @@ namespace MG_GL::GL {
if (count[i] <= 0) continue;
Diligent::MultiDrawIndexedItem item;
item.NumIndices = static_cast<Diligent::Uint32>(count[i]);
Diligent::Uint64 byteOffset = reinterpret_cast<Diligent::Uint64>(indices[i]);
auto byteOffset = reinterpret_cast<Diligent::Uint64>(indices[i]);
item.FirstIndexLocation = static_cast<Diligent::Uint32>(byteOffset / indexSize);
item.BaseVertex = static_cast<Diligent::Int32>(basevertex[i]);
drawItems.push_back(item);