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[Feat] (MG_Impl, MG_State, MG_Util): attach a buffer texture to a range of its buffer

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glTexBufferRange, glTextureBuffer and glTextureBufferRange were all stubs, so a
buffer texture could only ever be attached through glTexBuffer -- by binding, and
always to the whole buffer.

Give the buffer texture the window it is supposed to address. The non-range forms
record it as offset 0 with a whole-buffer sentinel rather than the size the buffer
happens to have, so a later respecify keeps being followed instead of freezing the
texture at yesterday's size. All four entry points now share one attach path,
differing only in how they name the texture: by binding for the target forms, by
name for the DSA ones.

Both backends honour the window: DirectVulkan offsets and clamps the buffer view,
DirectGLES uses glTexBufferRange when the texture names a sub-range and keeps
plain glTexBuffer for the whole-buffer case, which also works on a driver without
the range entry point.

GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT reported 0 with a comment explaining that the
range entry points were stubbed. It now reports what the device actually requires
-- minTexelBufferOffsetAlignment on Vulkan, the driver's own value on GLES -- and
the range entry points enforce it. Zero was never a legal answer; the minimum is
1, and an application that trusted it would have built unaligned offsets.
This commit is contained in:
BZLZHH
2026-08-04 20:53:53 -04:00
parent f39e6eb82d
commit bb582203d9
14 changed files with 155 additions and 7 deletions
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MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp
+1
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@@ -1112,6 +1112,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
m_dynamicParameters.MaxComputeWorkGroupInvocations = m_GLESCapabilities.MaxComputeWorkGroupInvocations;
m_dynamicParameters.MaxShaderStorageBufferBindings = m_GLESCapabilities.MaxShaderStorageBufferBindings;
m_dynamicParameters.MaxTextureBufferSize = m_GLESCapabilities.MaxTextureBufferSize;
m_dynamicParameters.TextureBufferOffsetAlignment = m_GLESCapabilities.TextureBufferOffsetAlignment;
m_dynamicParameters.MaxUniformBufferBindings = m_GLESCapabilities.MaxUniformBufferBindings;
m_dynamicParameters.MaxUniformBlockSize = m_GLESCapabilities.MaxUniformBlockSize;
const Int maxSupportedTextureUnits =
MobileGL/MG_Backend/DirectGLES/Managers.cpp
+18 -1
View File
@@ -2232,7 +2232,24 @@ namespace MobileGL::MG_Backend::DirectGLES {
"ID: %u, buffer ID: %u, buffer size: %zu, format: %s",
m_backendTextureId, backendId, buffer->GetSize(),
MG_Util::ConvertGLEnumToString(glInternalFormat).c_str());
g_GLESFuncs.glTexBuffer(GL_TEXTURE_BUFFER, glInternalFormat, backendId);
// A texture that names a window of the buffer needs the range form; the
// whole-buffer forms report offset 0 and the buffer's current size, which
// glTexBuffer expresses more directly (and works where the range entry point
// is absent).
const SizeT rangeOffset = textureBufferObject->GetBufferRangeOffset();
const SizeT rangeSize = textureBufferObject->GetBufferRangeSizeInBytes();
if (rangeOffset == 0 && rangeSize == buffer->GetSize()) {
g_GLESFuncs.glTexBuffer(GL_TEXTURE_BUFFER, glInternalFormat, backendId);
} else if (g_GLESFuncs.glTexBufferRange != nullptr) {
g_GLESFuncs.glTexBufferRange(GL_TEXTURE_BUFFER, glInternalFormat, backendId,
static_cast<GLintptr>(rangeOffset),
static_cast<GLsizeiptr>(rangeSize));
} else {
MGLOG_E("Texture buffer %u names a sub-range but the driver has no "
"glTexBufferRange; binding the whole buffer instead",
stateTextureObject->GetExternalIndex());
g_GLESFuncs.glTexBuffer(GL_TEXTURE_BUFFER, glInternalFormat, backendId);
}
DebugImpl::ErrorLopper::Loop(
[file = __FILE__, line = __LINE__, func = __func__, glInternalFormat, backendId](GLenum err) {
MGLOG_D("%s(%s:%d) glTexBuffer(format=%s, buffer=%u) ES error: %s",