swung0x48/MobileGL
1
0
Fork 0
mirror of https://github.com/MobileGL-Dev/MobileGL synced 2026-09-09 12:48:32 +09:00
Code Issues Packages Projects Releases Wiki Activity

[Feat] (MG_Impl, MG_Backend, MG_State): implement glMultiDrawArrays and glGetBufferSubData

Browse Source 
Two previously-stubbed GL 3.3 Core entry points.

glMultiDrawArrays: mirrors the existing glMultiDrawElements(BaseVertex)
architecture end to end -- a new MultiDrawArrays backend function-table
slot dispatched from the frontend after program/primitive-mode validation
(plus a drawcount < 0 -> GL_INVALID_VALUE guard).
- DirectGLES: PrepareForDraw once, then loop native glDrawArrays with the
  same per-range client-side array upload the single DrawArrays does.
- DirectVulkan: build a MultiDrawCmd payload and hand it to a new
  VulkanRenderer::MultiDrawArrays, which does one SetupDraw over the union
  of the sub-draw vertex ranges and then a vkCmdDraw per range (mirrors
  VulkanRenderer::MultiDrawElements).

glGetBufferSubData: reads a range of the bound buffer's CPU shadow into
client memory via a new BufferObject::DownloadSubData, with the same
validation shape as BufferSubData (INVALID_VALUE for negative/overflowing
range, INVALID_OPERATION for no bound buffer or a non-persistent mapped
buffer). The shadow reflects CPU writes and backend write-backs but not
arbitrary GPU-side writes, which is documented on the method.

Tests: 2 BufferTest cases for glGetBufferSubData (round-trip read of a
middle range and the whole buffer, plus out-of-range/negative/no-buffer
errors). BufferTest 32/32, SanityTest 30/30, VertexArrayTest 42/42;
library builds clean. (The glMultiDrawArrays draw paths are not
runtime-testable on this host and are compile-verified against the tested
MultiDrawElements pattern.)
This commit is contained in:
swung0x48
2026-07-10 23:46:14 -04:00
parent 4dd2b2216c
commit dc3c2cc5c7
17 changed files with 217 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
MobileGL/MG_Impl/GLImpl/Drawing/GL_Drawing.cpp
+19
View File
@@ -116,6 +116,13 @@ namespace MobileGL::MG_Impl::GLImpl {
MG_Backend::gBackendFunctionsTable.GL.DrawArrays(mode, first, count);
}
void MultiDrawArrays_Backend(GLenum mode, const GLint* first, const GLsizei* count, GLsizei drawcount) {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
#endif
MG_Backend::gBackendFunctionsTable.GL.MultiDrawArrays(mode, first, count, drawcount);
}
void DrawElementsBaseVertex_Backend(GLenum mode, GLsizei count, GLenum type, const void* indices,
GLint basevertex) {
#ifdef TRACY_ENABLE
@@ -426,6 +433,18 @@ namespace MobileGL::MG_Impl::GLImpl {
DrawArrays_Backend(mode, first, count);
}
void MultiDrawArrays(GLenum mode, const GLint* first, const GLsizei* count, GLsizei drawcount) {
if (!ValidateCurrentProgramForExecution(__func__)) return;
if (!ValidatePrimitiveModeForBackend(__func__, mode)) return;
if (drawcount < 0) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidValue,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "drawcount must be non-negative."));
return;
}
MultiDrawArrays_Backend(mode, first, count, drawcount);
}
void MultiDrawElements(GLenum mode, const GLsizei* count, GLenum type, const void* const* indices,
GLsizei drawcount) {
if (!ValidateCurrentProgramForExecution(__func__)) return;