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rhi: gl: Switch GetBufferSubData emulation to MapBufferRange

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Use only APIs that are in GLES 3.0.

glMapBuffer() is an old OES extension, stop bothering with that.
Not the least because ANGLE claims supporting it and then fails the
map. (not that we care much about ANGLE, but, for instance, the qrhi
autotest is run with ANGLE configurations as well in the CI, so have
to still take care of it for the duration of Qt 5.x)

Change-Id: I29140402cedffe0430f920ee0c061673257c3aa1
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
This commit is contained in:
Laszlo Agocs 2019-10-05 15:31:12 +02:00
parent 9c466946d0
commit 32924110ce
3 changed files with 19 additions and 13 deletions
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7
src/gui/rhi/qrhi.cpp
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@ -568,11 +568,10 @@ Q_LOGGING_CATEGORY(QRHI_LOG_INFO, "qt.rhi.general")
supports QRhiGraphicsPipeline::TriangleFan.
\value ReadBackNonUniformBuffer Indicates that
{QRhiResourceUpdateBatch::readBackBuffer()}{reading buffer contents} is
\l{QRhiResourceUpdateBatch::readBackBuffer()}{reading buffer contents} is
supported for QRhiBuffer instances with a usage different than
UniformBuffer. While this is supported in the majority of cases, it can be
unsupported, for example, on OpenGL ES 2.0 implementations without the
MapBuffer extension.
UniformBuffer. While this is supported in the majority of cases, it will be
unsupported with OpenGL ES older than 3.0.
*/
/*!

21
src/gui/rhi/qrhigles2.cpp
View File

@ -276,6 +276,10 @@ QT_BEGIN_NAMESPACE
#define GL_POINT_SPRITE 0x8861
#endif
#ifndef GL_MAP_READ_BIT
#define GL_MAP_READ_BIT 0x0001
#endif
Q_DECLARE_LOGGING_CATEGORY(lcOpenGLProgramDiskCache)
/*!
@ -492,7 +496,9 @@ bool QRhiGles2::create(QRhi::Flags flags)
else
caps.textureCompareMode = true;
caps.mapBuffer = f->hasOpenGLExtension(QOpenGLExtensions::MapBuffer);
// proper as in ES 3.0 (glMapBufferRange), not the old glMapBuffer
// extension(s) (which is not in ES 3.0...messy)
caps.properMapBuffer = f->hasOpenGLExtension(QOpenGLExtensions::MapBufferRange);
if (!caps.gles) {
f->glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
@ -737,7 +743,7 @@ bool QRhiGles2::isFeatureSupported(QRhi::Feature feature) const
case QRhi::TriangleFanTopology:
return true;
case QRhi::ReadBackNonUniformBuffer:
return !caps.gles || caps.mapBuffer;
return !caps.gles || caps.properMapBuffer;
default:
Q_UNREACHABLE();
return false;
@ -2107,13 +2113,14 @@ void QRhiGles2::executeCommandBuffer(QRhiCommandBuffer *cb)
QRhiBufferReadbackResult *result = cmd.args.getBufferSubData.result;
f->glBindBuffer(cmd.args.getBufferSubData.target, cmd.args.getBufferSubData.buffer);
if (caps.gles) {
if (caps.mapBuffer) {
void *p = f->glMapBuffer(cmd.args.getBufferSubData.target, GL_READ_ONLY);
if (caps.properMapBuffer) {
void *p = f->glMapBufferRange(cmd.args.getBufferSubData.target,
cmd.args.getBufferSubData.offset,
cmd.args.getBufferSubData.size,
GL_MAP_READ_BIT);
if (p) {
result->data.resize(cmd.args.getBufferSubData.size);
memcpy(result->data.data(),
reinterpret_cast<char *>(p) + cmd.args.getBufferSubData.offset,
size_t(cmd.args.getBufferSubData.size));
memcpy(result->data.data(), p, size_t(cmd.args.getBufferSubData.size));
f->glUnmapBuffer(cmd.args.getBufferSubData.target);
}
}

4
src/gui/rhi/qrhigles2_p_p.h
View File

@ -753,7 +753,7 @@ public:
baseVertex(false),
compute(false),
textureCompareMode(false),
mapBuffer(false)
properMapBuffer(false)
{ }
int ctxMajor;
int ctxMinor;
@ -784,7 +784,7 @@ public:
uint baseVertex : 1;
uint compute : 1;
uint textureCompareMode : 1;
uint mapBuffer : 1;
uint properMapBuffer : 1;
} caps;
QGles2SwapChain *currentSwapChain = nullptr;
QVector<GLint> supportedCompressedFormats;