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[Fix, Test] (MG_State, MG_Impl): ARB_vertex_attrib_binding state model - spec stride default, legacy stride/pointer shadows, divisor re-binds, core-profile VAO-0 rejection

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swung0x48
2026-08-11 08:49:37 -04:00
parent 964a7fcc92
commit d83b4dbbb5
5 changed files with 562 additions and 37 deletions
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MobileGL/MG_Impl/GLImpl/VertexArray/GL_VertexArray.cpp
+37 -12
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@@ -179,6 +179,28 @@ namespace MobileGL::MG_Impl::GLImpl {
return vao;
}
// The ARB_vertex_attrib_binding entry points that take no vertex array name modify the
// *bound* vertex array, and in a core profile the default vertex array (name 0) is not
// one: every one of them is INVALID_OPERATION there (GL 4.6 core 10.3.1, and the tail of
// each KHR-GL4x.vertex_attrib_binding.negative-* case checks exactly this). MobileGL
// keeps a real object at name 0 for the compatibility paths, so GetBoundVertexArray
// never returns null and the rule has to be spelled out - behind the same gate the VAO-0
// draw rule already uses (MOBILEGL_RELAXED_SEMANTICS, plus "the context never asked for
// a core profile"), so applications that legitimately run relaxed keep working.
static SharedPtr<MG_State::GLState::VertexArrayObject> GetBoundVertexArrayForBindingApi(const char* funcName) {
auto vao = GetBoundVertexArrayOrError(funcName);
if (!vao) return nullptr;
if (vao->GetExternalIndex() == 0 && !MG_State::IsRelaxedSemanticsActive()) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidOperation,
MakeUnique<GenericErrorInfo>(
"MG_Impl/GLImpl", funcName,
"The default vertex array object cannot be modified in a core profile."));
return nullptr;
}
return vao;
}
static bool ValidateVertexAttribPname(GLenum pname) {
switch (pname) {
case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
@@ -944,7 +966,7 @@ namespace MobileGL::MG_Impl::GLImpl {
params[0] = static_cast<GLfloat>(attr->Size);
return;
case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
params[0] = static_cast<GLfloat>(attr->Stride);
params[0] = static_cast<GLfloat>(attr->LegacyStride);
return;
case GL_VERTEX_ATTRIB_ARRAY_TYPE:
params[0] = static_cast<GLfloat>(MG_Util::ConvertDataTypeToGLEnum(attr->Type));
@@ -1014,7 +1036,7 @@ namespace MobileGL::MG_Impl::GLImpl {
params[0] = static_cast<GLdouble>(attr->Size);
return;
case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
params[0] = static_cast<GLdouble>(attr->Stride);
params[0] = static_cast<GLdouble>(attr->LegacyStride);
return;
case GL_VERTEX_ATTRIB_ARRAY_TYPE:
params[0] = static_cast<GLdouble>(MG_Util::ConvertDataTypeToGLEnum(attr->Type));
@@ -1079,8 +1101,11 @@ namespace MobileGL::MG_Impl::GLImpl {
case GL_VERTEX_ATTRIB_ARRAY_SIZE:
params[0] = attr->Size;
return;
// The legacy shadow, not the resolved draw stride: GL 4.6 core table 23.3 defines this
// as the last glVertexAttrib*Pointer argument, which glBindVertexBuffer must not
// overwrite even though it does overwrite what the backend actually reads.
case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
params[0] = attr->Stride;
params[0] = attr->LegacyStride;
return;
case GL_VERTEX_ATTRIB_ARRAY_TYPE:
params[0] = static_cast<GLint>(MG_Util::ConvertDataTypeToGLEnum(attr->Type));
@@ -1138,7 +1163,7 @@ namespace MobileGL::MG_Impl::GLImpl {
}
const auto& attr = vao->GetAttribute(index);
*pointer = reinterpret_cast<void*>(attr.Offset);
*pointer = reinterpret_cast<void*>(attr.LegacyPointer);
}
void GetVertexAttribIiv(GLuint index, GLenum pname, GLint* params) {
@@ -1222,7 +1247,7 @@ namespace MobileGL::MG_Impl::GLImpl {
*param = static_cast<GLint>(attr.Size);
return;
case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
*param = static_cast<GLint>(attr.Stride);
*param = static_cast<GLint>(attr.LegacyStride);
return;
case GL_VERTEX_ATTRIB_ARRAY_TYPE:
*param = static_cast<GLint>(MG_Util::ConvertDataTypeToGLEnum(attr.Type));
@@ -1294,14 +1319,14 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void BindVertexBuffer(GLuint bindingindex, GLuint buffer, GLintptr offset, GLsizei stride) {
auto vao = GetBoundVertexArrayOrError("BindVertexBuffer");
auto vao = GetBoundVertexArrayForBindingApi("BindVertexBuffer");
if (!vao) return;
VertexBufferBinding_State(vao, bindingindex, buffer, offset, stride, "BindVertexBuffer");
}
void BindVertexBuffers(GLuint first, GLsizei count, const GLuint* buffers, const GLintptr* offsets,
const GLsizei* strides) {
auto vao = GetBoundVertexArrayOrError("BindVertexBuffers");
auto vao = GetBoundVertexArrayForBindingApi("BindVertexBuffers");
if (!vao) return;
if (!ValidateVertexBindingRange(first, count, "BindVertexBuffers")) return;
for (GLsizei i = 0; i < count; ++i) {
@@ -1315,21 +1340,21 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void VertexAttribFormat(GLuint attribindex, GLint size, GLenum type, GLboolean normalized, GLuint relativeoffset) {
auto vao = GetBoundVertexArrayOrError("VertexAttribFormat");
auto vao = GetBoundVertexArrayForBindingApi("VertexAttribFormat");
if (!vao) return;
VertexAttribFormatSeparate_State(vao, attribindex, size, type, normalized, relativeoffset, false,
"VertexAttribFormat");
}
void VertexAttribIFormat(GLuint attribindex, GLint size, GLenum type, GLuint relativeoffset) {
auto vao = GetBoundVertexArrayOrError("VertexAttribIFormat");
auto vao = GetBoundVertexArrayForBindingApi("VertexAttribIFormat");
if (!vao) return;
VertexAttribFormatSeparate_State(vao, attribindex, size, type, GL_FALSE, relativeoffset, true,
"VertexAttribIFormat");
}
void VertexAttribLFormat(GLuint attribindex, GLint size, GLenum type, GLuint relativeoffset) {
auto vao = GetBoundVertexArrayOrError("VertexAttribLFormat");
auto vao = GetBoundVertexArrayForBindingApi("VertexAttribLFormat");
if (!vao) return;
VertexAttribLFormatSeparate_State(vao, attribindex, size, type, relativeoffset);
}
@@ -1341,7 +1366,7 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void VertexAttribBinding(GLuint attribindex, GLuint bindingindex) {
auto vao = GetBoundVertexArrayOrError("VertexAttribBinding");
auto vao = GetBoundVertexArrayForBindingApi("VertexAttribBinding");
if (!vao) return;
if (!VertexArrayImpl::ValidateVertexAttributeIndex(attribindex)) return;
if (!ValidateVertexBindingIndex(bindingindex, "VertexAttribBinding")) return;
@@ -1349,7 +1374,7 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void VertexBindingDivisor(GLuint bindingindex, GLuint divisor) {
auto vao = GetBoundVertexArrayOrError("VertexBindingDivisor");
auto vao = GetBoundVertexArrayForBindingApi("VertexBindingDivisor");
if (!vao) return;
if (!ValidateVertexBindingIndex(bindingindex, "VertexBindingDivisor")) return;
vao->SetBindingDivisor(bindingindex, divisor);