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[Feat] (MG_Backend/DirectVulkan): native GPU indirect draws + draw parameters

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- Enable multiDrawIndirect and shaderDrawParameters device features when
  supported (the latter via VkPhysicalDeviceShaderDrawParametersFeatures on
  Vulkan 1.1+), so DrawIndex/BaseInstance SPIR-V builtins are valid and
  vkCmdDrawIndexedIndirect(Count) may draw more than one command.
- Plain glMultiDrawElementsIndirect no longer requires a GL_PARAMETER_BUFFER
  (it previously drew nothing for the standard Flywheel call); it now issues
  a native vkCmdDrawIndexedIndirect, with a per-command loop fallback when
  the multiDrawIndirect feature is unavailable.
- glDrawElementsIndirect / glDrawArraysIndirect / glMultiDrawArraysIndirect
  read the live GPU buffer via native indirect draws instead of the CPU
  shadow (which cannot see compute-written commands); the CPU path remains
  only for client-memory commands.
- Advertise the same five extensions as DirectGLES for Flywheel's
  capability probe.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
swung0x48
2026-07-08 13:33:05 +00:00
co-authored by Claude Fable 5
parent 5ea49f3c50
commit 638999213e
4 changed files with 227 additions and 15 deletions
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MobileGL/MG_Backend/DirectVulkan/DirectVulkan.cpp
+29 -1
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@@ -409,7 +409,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
void MultiDrawElementsIndirect(GLenum mode, GLenum type, const void* indirect, GLsizei drawcount, GLsizei stride) {
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::MultiDrawElementsIndirect called with null VulkanRenderer");
MOBILEGL_ASSERT(MG_State::pGLContext, "DirectVulkan::MultiDrawElementsIndirect called with null GL context");
pVulkanRenderer->MultiDrawElementsIndirectCount(mode, type, indirect, 0, drawcount, stride);
pVulkanRenderer->MultiDrawElementsIndirect(mode, type, indirect, drawcount, stride);
}
void MultiDrawArraysIndirect(GLenum mode, const void* indirect, GLsizei drawcount, GLsizei stride) {
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::MultiDrawArraysIndirect called with null VulkanRenderer");
@@ -418,6 +418,15 @@ namespace MobileGL::MG_Backend::DirectVulkan {
if (drawcount <= 0) {
return;
}
// With a bound GL_DRAW_INDIRECT_BUFFER the command parameters may be GPU-written
// (e.g. by a compute shader), so consume them natively on the GPU.
auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
if (drawBuffer) {
pVulkanRenderer->MultiDrawArraysIndirect(mode, indirect, drawcount, stride);
return;
}
if (stride == 0) {
stride = sizeof(DrawArraysIndirectCommand);
}
@@ -427,6 +436,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
return;
}
// No indirect buffer bound: the pointer refers to client memory.
const auto* commandBytes = ResolveIndirectCommandBytes(
indirect,
static_cast<SizeT>(stride) * static_cast<SizeT>(drawcount - 1) + sizeof(DrawArraysIndirectCommand),
@@ -541,6 +551,15 @@ namespace MobileGL::MG_Backend::DirectVulkan {
return;
}
// With a bound GL_DRAW_INDIRECT_BUFFER the command parameters may be GPU-written
// (e.g. by a compute shader), so consume them natively on the GPU.
auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
if (drawBuffer) {
pVulkanRenderer->MultiDrawElementsIndirect(mode, type, indirect, 1, 0);
return;
}
// No indirect buffer bound: the pointer refers to client memory.
const auto* commandBytes =
ResolveIndirectCommandBytes(indirect, sizeof(DrawElementsIndirectCommand), "DrawElementsIndirect");
if (!commandBytes) {
@@ -585,6 +604,15 @@ namespace MobileGL::MG_Backend::DirectVulkan {
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::DrawArraysIndirect called with null VulkanRenderer");
MOBILEGL_ASSERT(MG_State::pGLContext, "DirectVulkan::DrawArraysIndirect called with null GL context");
// With a bound GL_DRAW_INDIRECT_BUFFER the command parameters may be GPU-written
// (e.g. by a compute shader), so consume them natively on the GPU.
auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
if (drawBuffer) {
pVulkanRenderer->MultiDrawArraysIndirect(mode, indirect, 1, 0);
return;
}
// No indirect buffer bound: the pointer refers to client memory.
const auto* commandBytes =
ResolveIndirectCommandBytes(indirect, sizeof(DrawArraysIndirectCommand), "DrawArraysIndirect");
if (!commandBytes) {