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magnum/src/Magnum/GL/Mesh.cpp

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/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
2020, 2021 Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "Mesh.h"
#include <vector>
#include <Corrade/Utility/Debug.h>
#include "Magnum/Mesh.h"
#include "Magnum/GL/Buffer.h"
#include "Magnum/GL/Context.h"
#include "Magnum/GL/Extensions.h"
#ifndef MAGNUM_TARGET_GLES
#include "Magnum/GL/TransformFeedback.h"
#endif
#include "Magnum/GL/Implementation/BufferState.h"
#ifndef MAGNUM_TARGET_WEBGL
#include "Magnum/GL/Implementation/DebugState.h"
#endif
#include "Magnum/GL/Implementation/MeshState.h"
#include "Magnum/GL/Implementation/State.h"
#ifdef MAGNUM_BUILD_DEPRECATED
#include "Magnum/GL/AbstractShaderProgram.h"
#endif
namespace Magnum { namespace GL {
namespace {
constexpr MeshPrimitive PrimitiveMapping[]{
MeshPrimitive::Points,
MeshPrimitive::Lines,
MeshPrimitive::LineLoop,
MeshPrimitive::LineStrip,
MeshPrimitive::Triangles,
MeshPrimitive::TriangleStrip,
MeshPrimitive::TriangleFan,
MeshPrimitive(~UnsignedInt{}), /* Instances */
MeshPrimitive(~UnsignedInt{}), /* Faces */
MeshPrimitive(~UnsignedInt{}) /* Edges */
};
constexpr MeshIndexType IndexTypeMapping[]{
MeshIndexType::UnsignedByte,
MeshIndexType::UnsignedShort,
MeshIndexType::UnsignedInt
};
}
bool hasMeshPrimitive(const Magnum::MeshPrimitive primitive) {
if(isMeshPrimitiveImplementationSpecific(primitive))
return true;
CORRADE_ASSERT(UnsignedInt(primitive) - 1 < Containers::arraySize(PrimitiveMapping),
"GL::hasPrimitive(): invalid primitive" << primitive, {});
return UnsignedInt(PrimitiveMapping[UnsignedInt(primitive) - 1]) != ~UnsignedInt{};
}
MeshPrimitive meshPrimitive(const Magnum::MeshPrimitive primitive) {
if(isMeshPrimitiveImplementationSpecific(primitive))
return meshPrimitiveUnwrap<GL::MeshPrimitive>(primitive);
CORRADE_ASSERT(UnsignedInt(primitive) - 1 < Containers::arraySize(PrimitiveMapping),
"GL::meshPrimitive(): invalid primitive" << primitive, {});
const MeshPrimitive out = PrimitiveMapping[UnsignedInt(primitive) - 1];
CORRADE_ASSERT(out != MeshPrimitive(~UnsignedInt{}),
"GL::meshPrimitive(): unsupported primitive" << primitive, {});
return out;
}
MeshIndexType meshIndexType(const Magnum::MeshIndexType type) {
CORRADE_ASSERT(UnsignedInt(type) - 1 < Containers::arraySize(IndexTypeMapping),
"GL::meshIndexType(): invalid type" << type, {});
return IndexTypeMapping[UnsignedInt(type) - 1];
}
#ifndef DOXYGEN_GENERATING_OUTPUT
Debug& operator<<(Debug& debug, const MeshPrimitive value) {
debug << "GL::MeshPrimitive" << Debug::nospace;
switch(value) {
/* LCOV_EXCL_START */
#define _c(value) case MeshPrimitive::value: return debug << "::" #value;
_c(Points)
_c(Lines)
_c(LineLoop)
_c(LineStrip)
#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
_c(LineStripAdjacency)
_c(LinesAdjacency)
#endif
_c(Triangles)
_c(TriangleStrip)
_c(TriangleFan)
#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
_c(TrianglesAdjacency)
_c(TriangleStripAdjacency)
_c(Patches)
#endif
#undef _c
/* LCOV_EXCL_STOP */
}
return debug << "(" << Debug::nospace << reinterpret_cast<void*>(GLenum(value)) << Debug::nospace << ")";
}
Debug& operator<<(Debug& debug, const MeshIndexType value) {
debug << "GL::MeshIndexType" << Debug::nospace;
switch(value) {
/* LCOV_EXCL_START */
#define _c(value) case MeshIndexType::value: return debug << "::" #value;
_c(UnsignedByte)
_c(UnsignedShort)
_c(UnsignedInt)
#undef _c
/* LCOV_EXCL_STOP */
}
return debug << "(" << Debug::nospace << reinterpret_cast<void*>(GLenum(value)) << Debug::nospace << ")";
}
#endif
struct Mesh::AttributeLayout {
explicit AttributeLayout(const Buffer& buffer, GLuint location, GLint size, GLenum type, DynamicAttribute::Kind kind, GLintptr offset, GLsizei stride, GLuint divisor) noexcept: buffer{Buffer::wrap(buffer.id())}, location{location}, size{size}, type{type}, kind{kind}, offset{offset}, stride{stride}, divisor{divisor} {}
AttributeLayout(AttributeLayout&&) noexcept = default;
AttributeLayout(const AttributeLayout&) noexcept = delete;
AttributeLayout& operator=(AttributeLayout&&) noexcept = default;
AttributeLayout& operator=(const AttributeLayout&) noexcept = delete;
Buffer buffer;
GLuint location;
GLint size;
GLenum type;
DynamicAttribute::Kind kind;
GLintptr offset;
GLsizei stride;
GLuint divisor;
};
UnsignedInt Mesh::maxVertexAttributeStride() {
#ifdef MAGNUM_TARGET_WEBGL
/* Defined for WebGL 1 and for the new vertexAttribIPointer in WebGL 2 too:
https://www.khronos.org/registry/webgl/specs/latest/1.0/index.html#5.14.10
https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.8
*/
return 255;
#else
#ifndef MAGNUM_TARGET_GLES
if(!Context::current().isVersionSupported(Version::GL440))
#elif !defined(MAGNUM_TARGET_GLES2)
if(!Context::current().isVersionSupported(Version::GLES310))
#endif
{
return 0xffffffffu;
}
#ifndef MAGNUM_TARGET_GLES2
GLint& value = Context::current().state().mesh.maxVertexAttributeStride;
/* Get the value, if not already cached */
if(value == 0)
glGetIntegerv(GL_MAX_VERTEX_ATTRIB_STRIDE, &value);
return value;
#endif
#endif
}
#ifndef MAGNUM_TARGET_GLES2
#ifndef MAGNUM_TARGET_WEBGL
Long Mesh::maxElementIndex()
#else
Int Mesh::maxElementIndex()
#endif
{
#ifndef MAGNUM_TARGET_GLES
if(!Context::current().isExtensionSupported<Extensions::ARB::ES3_compatibility>())
return 0xFFFFFFFFl;
#endif
#ifndef MAGNUM_TARGET_WEBGL
GLint64& value =
#else
GLint& value =
#endif
Context::current().state().mesh.maxElementIndex;
/* Get the value, if not already cached */
if(value == 0) {
#ifndef MAGNUM_TARGET_WEBGL
glGetInteger64v(GL_MAX_ELEMENT_INDEX, &value);
#else
glGetIntegerv(GL_MAX_ELEMENT_INDEX, &value);
#endif
}
return value;
}
Int Mesh::maxElementsIndices() {
GLint& value = Context::current().state().mesh.maxElementsIndices;
/* Get the value, if not already cached */
if(value == 0)
glGetIntegerv(GL_MAX_ELEMENTS_INDICES, &value);
return value;
}
Int Mesh::maxElementsVertices() {
GLint& value = Context::current().state().mesh.maxElementsVertices;
/* Get the value, if not already cached */
if(value == 0)
glGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &value);
return value;
}
#endif
Mesh::Mesh(const MeshPrimitive primitive): _primitive{primitive}, _flags{ObjectFlag::DeleteOnDestruction} {
(this->*Context::current().state().mesh.createImplementation)(true);
}
Mesh::Mesh(NoCreateT) noexcept: _id{0}, _primitive{MeshPrimitive::Triangles}, _flags{ObjectFlag::DeleteOnDestruction} {}
Mesh::~Mesh() {
const bool deleteObject = _id && (_flags & ObjectFlag::DeleteOnDestruction);
/* Moved out or not deleting on destruction, nothing to do */
if(deleteObject) {
/* Remove current vao from the state */
GLuint& current = Context::current().state().mesh.currentVAO;
if(current == _id) current = 0;
}
if(_constructed) (this->*Context::current().state().mesh.destroyImplementation)(deleteObject);
}
Mesh::Mesh(Mesh&& other) noexcept: _id(other._id), _primitive(other._primitive), _flags{other._flags}, _countSet{other._countSet}, _count(other._count), _baseVertex{other._baseVertex}, _instanceCount{other._instanceCount},
#ifndef MAGNUM_TARGET_GLES
_baseInstance{other._baseInstance},
#endif
#ifndef MAGNUM_TARGET_GLES2
_indexStart(other._indexStart), _indexEnd(other._indexEnd),
#endif
_indexOffset(other._indexOffset), _indexType(other._indexType), _indexBuffer{std::move(other._indexBuffer)}
{
if(_constructed || other._constructed)
(this->*Context::current().state().mesh.moveConstructImplementation)(std::move(other));
other._id = 0;
}
Mesh& Mesh::operator=(Mesh&& other) noexcept {
using std::swap;
swap(_id, other._id);
swap(_flags, other._flags);
swap(_primitive, other._primitive);
swap(_countSet, other._countSet);
swap(_count, other._count);
swap(_baseVertex, other._baseVertex);
swap(_instanceCount, other._instanceCount);
#ifndef MAGNUM_TARGET_GLES
swap(_baseInstance, other._baseInstance);
#endif
#ifndef MAGNUM_TARGET_GLES2
swap(_indexStart, other._indexStart);
swap(_indexEnd, other._indexEnd);
#endif
swap(_indexOffset, other._indexOffset);
swap(_indexType, other._indexType);
swap(_indexBuffer, other._indexBuffer);
if(_constructed || other._constructed)
(this->*Context::current().state().mesh.moveAssignImplementation)(std::move(other));
return *this;
}
Mesh::Mesh(const GLuint id, const MeshPrimitive primitive, const ObjectFlags flags): _id{id}, _primitive{primitive}, _flags{flags} {
(this->*Context::current().state().mesh.createImplementation)(false);
}
inline void Mesh::createIfNotAlready() {
/* If VAO extension is not available, the following is always true */
if(_flags & ObjectFlag::Created) return;
/* glGen*() does not create the object, just reserves the name. Some
commands (such as glObjectLabel()) operate with IDs directly and they
require the object to be created. Binding the VAO finally creates it.
Also all EXT DSA functions implicitly create it. */
bindVAO();
CORRADE_INTERNAL_ASSERT(_flags & ObjectFlag::Created);
}
#ifndef MAGNUM_TARGET_WEBGL
std::string Mesh::label() {
createIfNotAlready();
#ifndef MAGNUM_TARGET_GLES2
return Context::current().state().debug.getLabelImplementation(GL_VERTEX_ARRAY, _id);
#else
return Context::current().state().debug.getLabelImplementation(GL_VERTEX_ARRAY_KHR, _id);
#endif
}
Mesh& Mesh::setLabelInternal(const Containers::ArrayView<const char> label) {
createIfNotAlready();
#ifndef MAGNUM_TARGET_GLES2
Context::current().state().debug.labelImplementation(GL_VERTEX_ARRAY, _id, label);
#else
Context::current().state().debug.labelImplementation(GL_VERTEX_ARRAY_KHR, _id, label);
#endif
return *this;
}
#endif
MeshIndexType Mesh::indexType() const {
CORRADE_ASSERT(_indexBuffer.id(), "Mesh::indexType(): mesh is not indexed", {});
return _indexType;
}
UnsignedInt Mesh::indexTypeSize() const {
CORRADE_ASSERT(_indexBuffer.id(), "Mesh::indexTypeSize(): mesh is not indexed", {});
switch(_indexType) {
case MeshIndexType::UnsignedByte: return 1;
case MeshIndexType::UnsignedShort: return 2;
case MeshIndexType::UnsignedInt: return 4;
}
CORRADE_INTERNAL_ASSERT_UNREACHABLE(); /* LCOV_EXCL_LINE */
}
Mesh& Mesh::addVertexBufferInstanced(Buffer& buffer, const UnsignedInt divisor, const GLintptr offset, const GLsizei stride, const DynamicAttribute& attribute) {
for(UnsignedInt i = 0; i != attribute.vectors(); ++i)
attributePointerInternal(AttributeLayout{buffer,
attribute.location() + i,
GLint(attribute.components()),
GLenum(attribute.dataType()),
attribute.kind(),
GLintptr(offset + i*attribute.vectorStride()),
stride,
divisor});
return *this;
}
Mesh& Mesh::setIndexBuffer(Buffer&& buffer, GLintptr offset, MeshIndexType type, UnsignedInt start, UnsignedInt end) {
CORRADE_ASSERT(buffer.id(),
"GL::Mesh::setIndexBuffer(): empty or moved-out Buffer instance was passed", *this);
#ifdef MAGNUM_TARGET_WEBGL
CORRADE_ASSERT(buffer.targetHint() == Buffer::TargetHint::ElementArray,
"GL::Mesh::setIndexBuffer(): the buffer has unexpected target hint, expected" << Buffer::TargetHint::ElementArray << "but got" << buffer.targetHint(), *this);
#endif
/* It's IMPORTANT to do this *before* the _indexBuffer is set, since the
bindVAO() function called from here is resetting element buffer state
tracker to _indexBuffer.id(). */
(this->*Context::current().state().mesh.bindIndexBufferImplementation)(buffer);
_indexBuffer = std::move(buffer);
_indexOffset = offset;
_indexType = type;
#ifndef MAGNUM_TARGET_GLES2
_indexStart = start;
_indexEnd = end;
#else
static_cast<void>(start);
static_cast<void>(end);
#endif
return *this;
}
Mesh& Mesh::setIndexBuffer(Buffer& buffer, const GLintptr offset, const MeshIndexType type, const UnsignedInt start, const UnsignedInt end) {
setIndexBuffer(Buffer::wrap(buffer.id(), buffer.targetHint()), offset, type, start, end);
return *this;
}
#ifndef MAGNUM_TARGET_GLES2
void Mesh::drawInternal(Int count, Int baseVertex, Int instanceCount, UnsignedInt baseInstance, GLintptr indexOffset, Int indexStart, Int indexEnd)
#else
void Mesh::drawInternal(Int count, Int baseVertex, Int instanceCount, GLintptr indexOffset)
#endif
{
const Implementation::MeshState& state = Context::current().state().mesh;
(this->*state.bindImplementation)();
/* Non-instanced mesh */
if(instanceCount == 1) {
/* Non-indexed mesh */
if(!_indexBuffer.id()) {
glDrawArrays(GLenum(_primitive), baseVertex, count);
/* Indexed mesh with base vertex */
} else if(baseVertex) {
#if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
#ifndef MAGNUM_TARGET_GLES2
/* Indexed mesh with specified range */
if(indexEnd) {
#ifndef MAGNUM_TARGET_GLES
glDrawRangeElementsBaseVertex
#else
state.drawRangeElementsBaseVertexImplementation
#endif
(GLenum(_primitive), indexStart, indexEnd, count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), baseVertex);
/* Indexed mesh */
} else
#endif
{
#ifndef MAGNUM_TARGET_GLES
glDrawElementsBaseVertex
#else
state.drawElementsBaseVertexImplementation
#endif
(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), baseVertex);
}
#else
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): indexed mesh draw with base vertex specification possible only since WebGL 2.0", );
#endif
/* Indexed mesh */
} else {
/** @todo re-enable once https://github.com/kripken/emscripten/pull/7112
is merged and Emscripten versions with this change are
widespread enough */
#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
/* Indexed mesh with specified range */
if(indexEnd) {
glDrawRangeElements(GLenum(_primitive), indexStart, indexEnd, count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset));
/* Indexed mesh */
} else
#elif !defined(MAGNUM_TARGET_GLES2)
static_cast<void>(indexStart);
static_cast<void>(indexEnd);
#endif
{
glDrawElements(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset));
}
}
/* Instanced mesh */
} else {
/* Non-indexed mesh */
if(!_indexBuffer.id()) {
#ifndef MAGNUM_TARGET_GLES2
/* Non-indexed mesh with base instance */
if(baseInstance) {
#ifndef MAGNUM_TARGET_GLES
glDrawArraysInstancedBaseInstance
#else
state.drawArraysInstancedBaseInstanceImplementation
#endif
(GLenum(_primitive), baseVertex, count, instanceCount, baseInstance);
/* Non-indexed mesh */
} else
#endif
{
#ifndef MAGNUM_TARGET_GLES2
glDrawArraysInstanced
#else
state.drawArraysInstancedImplementation
#endif
(GLenum(_primitive), baseVertex, count, instanceCount);
}
/* Indexed mesh with base vertex */
} else if(baseVertex) {
#ifndef MAGNUM_TARGET_GLES2
/* Indexed mesh with base vertex and base instance */
if(baseInstance) {
#ifndef MAGNUM_TARGET_GLES
glDrawElementsInstancedBaseVertexBaseInstance
#else
state.drawElementsInstancedBaseVertexBaseInstanceImplementation
#endif
(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), instanceCount, baseVertex, baseInstance);
/* Indexed mesh with base vertex */
} else {
#ifndef MAGNUM_TARGET_GLES
glDrawElementsInstancedBaseVertex
#else
state.drawElementsInstancedBaseVertexImplementation
#endif
(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), instanceCount, baseVertex);
}
#else
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): instanced indexed mesh draw with base vertex specification possible only since OpenGL ES 3.0", );
#endif
/* Indexed mesh */
} else {
#ifndef MAGNUM_TARGET_GLES2
/* Indexed mesh with base instance */
if(baseInstance) {
#ifndef MAGNUM_TARGET_GLES
glDrawElementsInstancedBaseInstance
#else
state.drawElementsInstancedBaseInstanceImplementation
#endif
(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), instanceCount, baseInstance);
/* Instanced mesh */
} else
#endif
{
#ifndef MAGNUM_TARGET_GLES2
glDrawElementsInstanced
#else
state.drawElementsInstancedImplementation
#endif
(GLenum(_primitive), count, GLenum(_indexType), reinterpret_cast<GLvoid*>(indexOffset), instanceCount);
}
}
}
(this->*state.unbindImplementation)();
}
#ifndef MAGNUM_TARGET_GLES
void Mesh::drawInternal(TransformFeedback& xfb, const UnsignedInt stream, const Int instanceCount) {
const Implementation::MeshState& state = Context::current().state().mesh;
(this->*state.bindImplementation)();
/* Default stream */
if(stream == 0) {
/* Non-instanced mesh */
if(instanceCount == 1) glDrawTransformFeedback(GLenum(_primitive), xfb.id());
/* Instanced mesh */
else glDrawTransformFeedbackInstanced(GLenum(_primitive), xfb.id(), instanceCount);
/* Specific stream */
} else {
/* Non-instanced mesh */
if(instanceCount == 1) glDrawTransformFeedbackStream(GLenum(_primitive), xfb.id(), stream);
/* Instanced mesh */
else glDrawTransformFeedbackStreamInstanced(GLenum(_primitive), xfb.id(), stream, instanceCount);
}
(this->*state.unbindImplementation)();
}
#endif
#ifdef MAGNUM_BUILD_DEPRECATED
Mesh& Mesh::draw(AbstractShaderProgram& shader) {
shader.draw(*this);
return *this;
}
Mesh& Mesh::draw(AbstractShaderProgram&& shader) {
shader.draw(*this);
return *this;
}
#ifndef MAGNUM_TARGET_GLES
Mesh& Mesh::draw(AbstractShaderProgram& shader, TransformFeedback& xfb, UnsignedInt stream) {
shader.drawTransformFeedback(*this, xfb, stream);
return *this;
}
Mesh& Mesh::draw(AbstractShaderProgram&& shader, TransformFeedback& xfb, UnsignedInt stream) {
shader.drawTransformFeedback(*this, xfb, stream);
return *this;
}
#endif
#endif
void Mesh::bindVAOImplementationDefault(GLuint) {}
void Mesh::bindVAOImplementationVAO(const GLuint id) {
#ifndef MAGNUM_TARGET_GLES2
glBindVertexArray
#else
glBindVertexArrayOES
#endif
(Context::current().state().mesh.currentVAO = id);
}
void Mesh::bindVAO() {
GLuint& current = Context::current().state().mesh.currentVAO;
if(current != _id) {
/* Binding the VAO finally creates it */
_flags |= ObjectFlag::Created;
bindVAOImplementationVAO(_id);
/* Reset element buffer binding, because binding a different VAO with a
different index buffer will change that binding as well. (GL state,
what the hell.). The _indexBuffer.id() is the index buffer that's
already attached to this particular VAO (or 0, if there's none). In
particular, the setIndexBuffer() buffers call this function *and
then* sets the _indexBuffer, which means at this point the ID will
be still 0. */
Context::current().state().buffer.bindings[Implementation::BufferState::indexForTarget(Buffer::TargetHint::ElementArray)] = _indexBuffer.id();
}
}
void Mesh::createImplementationDefault(bool) {
_id = 0;
_flags |= ObjectFlag::Created;
static_assert(sizeof(_attributes) >= sizeof(std::vector<AttributeLayout>),
"attribute storage buffer size too small");
new(&_attributes) std::vector<AttributeLayout>;
_constructed = true;
}
void Mesh::createImplementationVAO(const bool createObject) {
if(createObject) {
#ifndef MAGNUM_TARGET_GLES2
glGenVertexArrays(1, &_id);
#else
glGenVertexArraysOES(1, &_id);
#endif
CORRADE_INTERNAL_ASSERT(_id != Implementation::State::DisengagedBinding);
}
static_assert(sizeof(_attributes) >= sizeof(std::vector<Buffer>),
"attribute storage buffer size too small");
new(&_attributes) std::vector<Buffer>;
_constructed = true;
}
#ifndef MAGNUM_TARGET_GLES
void Mesh::createImplementationVAODSA(const bool createObject) {
if(createObject) {
glCreateVertexArrays(1, &_id);
_flags |= ObjectFlag::Created;
}
static_assert(sizeof(_attributes) >= sizeof(std::vector<Buffer>),
"attribute storage buffer size too small");
new(&_attributes) std::vector<Buffer>;
_constructed = true;
}
#endif
void Mesh::moveConstructImplementationDefault(Mesh&& other) {
new(&_attributes) std::vector<AttributeLayout>{std::move(*reinterpret_cast<std::vector<AttributeLayout>*>(&other._attributes))};
_constructed = true;
}
void Mesh::moveConstructImplementationVAO(Mesh&& other) {
new(&_attributes) std::vector<Buffer>{std::move(*reinterpret_cast<std::vector<Buffer>*>(&other._attributes))};
_constructed = true;
}
/* In the move construction / assignment we need to stay noexcept, which means
it's only possible to swap or move-construct the vector, can't delete or
allocate. So, in the particular case where `this` is constructed and `other`
is not, we do a "partial swap" -- `other` gets our data and our data gets
emptied. */
void Mesh::moveAssignImplementationDefault(Mesh&& other) {
if(_constructed && other._constructed)
std::swap(*reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes),
*reinterpret_cast<std::vector<AttributeLayout>*>(&other._attributes));
else if(_constructed && !other._constructed) {
other._constructed = true;
new(&other._attributes) std::vector<AttributeLayout>{std::move(*reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes))};
} else if(!_constructed && other._constructed) {
_constructed = true;
new(&_attributes) std::vector<AttributeLayout>{std::move(*reinterpret_cast<std::vector<AttributeLayout>*>(&other._attributes))};
}
}
void Mesh::moveAssignImplementationVAO(Mesh&& other) {
if(_constructed && other._constructed)
std::swap(*reinterpret_cast<std::vector<Buffer>*>(&_attributes),
*reinterpret_cast<std::vector<Buffer>*>(&other._attributes));
else if(_constructed && !other._constructed) {
other._constructed = true;
new(&other._attributes) std::vector<Buffer>{std::move(*reinterpret_cast<std::vector<Buffer>*>(&_attributes))};
} else if(!_constructed && other._constructed) {
_constructed = true;
new(&_attributes) std::vector<Buffer>{std::move(*reinterpret_cast<std::vector<Buffer>*>(&other._attributes))};
}
}
void Mesh::destroyImplementationDefault(bool) {
reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes)->~vector();
}
void Mesh::destroyImplementationVAO(const bool deleteObject) {
if(deleteObject) {
#ifndef MAGNUM_TARGET_GLES2
glDeleteVertexArrays(1, &_id);
#else
glDeleteVertexArraysOES(1, &_id);
#endif
}
reinterpret_cast<std::vector<Buffer>*>(&_attributes)->~vector();
}
void Mesh::attributePointerInternal(const Buffer& buffer, const GLuint location, const GLint size, const GLenum type, const DynamicAttribute::Kind kind, const GLintptr offset, const GLsizei stride, const GLuint divisor) {
attributePointerInternal(AttributeLayout{buffer, location, size, type, kind, offset, stride, divisor});
}
void Mesh::attributePointerInternal(AttributeLayout&& attribute) {
CORRADE_ASSERT(attribute.buffer.id(),
"GL::Mesh::addVertexBuffer(): empty or moved-out Buffer instance was passed", );
(this->*Context::current().state().mesh.attributePointerImplementation)(std::move(attribute));
}
void Mesh::attributePointerImplementationDefault(AttributeLayout&& attribute) {
#ifdef MAGNUM_TARGET_WEBGL
CORRADE_ASSERT(attribute.buffer.targetHint() == Buffer::TargetHint::Array,
"GL::Mesh::addVertexBuffer(): the buffer has unexpected target hint, expected" << Buffer::TargetHint::Array << "but got" << attribute.buffer.targetHint(), );
#endif
reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes)->push_back(std::move(attribute));
}
void Mesh::attributePointerImplementationVAO(AttributeLayout&& attribute) {
#ifdef MAGNUM_TARGET_WEBGL
CORRADE_ASSERT(attribute.buffer.targetHint() == Buffer::TargetHint::Array,
"GL::Mesh::addVertexBuffer(): the buffer has unexpected target hint, expected" << Buffer::TargetHint::Array << "but got" << attribute.buffer.targetHint(), );
#endif
bindVAO();
vertexAttribPointer(attribute);
}
#ifndef MAGNUM_TARGET_GLES
void Mesh::attributePointerImplementationVAODSA(AttributeLayout&& attribute) {
glEnableVertexArrayAttrib(_id, attribute.location);
#ifndef MAGNUM_TARGET_GLES2
if(attribute.kind == DynamicAttribute::Kind::Integral)
glVertexArrayAttribIFormat(_id, attribute.location, attribute.size, attribute.type, 0);
#ifndef MAGNUM_TARGET_GLES
else if(attribute.kind == DynamicAttribute::Kind::Long)
glVertexArrayAttribLFormat(_id, attribute.location, attribute.size, attribute.type, 0);
#endif
else
#endif
{
glVertexArrayAttribFormat(_id, attribute.location, attribute.size, attribute.type, attribute.kind == DynamicAttribute::Kind::GenericNormalized, 0);
}
glVertexArrayAttribBinding(_id, attribute.location, attribute.location);
CORRADE_INTERNAL_ASSERT(attribute.stride != 0);
glVertexArrayVertexBuffer(_id, attribute.location, attribute.buffer.id(), attribute.offset, attribute.stride);
if(attribute.divisor)
(this->*Context::current().state().mesh.vertexAttribDivisorImplementation)(attribute.location, attribute.divisor);
}
#ifdef CORRADE_TARGET_WINDOWS
void Mesh::attributePointerImplementationVAODSAIntelWindows(AttributeLayout&& attribute) {
/* See the "intel-windows-broken-dsa-integer-vertex-attributes" workaround
for more information. */
if(attribute.kind == DynamicAttribute::Kind::Integral)
return attributePointerImplementationVAO(std::move(attribute));
else
return attributePointerImplementationVAODSA(std::move(attribute));
}
#endif
#endif
void Mesh::vertexAttribPointer(AttributeLayout& attribute) {
glEnableVertexAttribArray(attribute.location);
attribute.buffer.bindInternal(Buffer::TargetHint::Array);
#ifndef MAGNUM_TARGET_GLES2
if(attribute.kind == DynamicAttribute::Kind::Integral)
glVertexAttribIPointer(attribute.location, attribute.size, attribute.type, attribute.stride, reinterpret_cast<const GLvoid*>(attribute.offset));
#ifndef MAGNUM_TARGET_GLES
else if(attribute.kind == DynamicAttribute::Kind::Long)
glVertexAttribLPointer(attribute.location, attribute.size, attribute.type, attribute.stride, reinterpret_cast<const GLvoid*>(attribute.offset));
#endif
else
#endif
{
glVertexAttribPointer(attribute.location, attribute.size, attribute.type, attribute.kind == DynamicAttribute::Kind::GenericNormalized, attribute.stride, reinterpret_cast<const GLvoid*>(attribute.offset));
}
if(attribute.divisor) {
#ifndef MAGNUM_TARGET_GLES2
glVertexAttribDivisor(attribute.location, attribute.divisor);
#else
(this->*Context::current().state().mesh.vertexAttribDivisorImplementation)(attribute.location, attribute.divisor);
#endif
}
}
#ifndef MAGNUM_TARGET_GLES
void Mesh::vertexAttribDivisorImplementationVAO(const GLuint index, const GLuint divisor) {
bindVAO();
glVertexAttribDivisor(index, divisor);
}
void Mesh::vertexAttribDivisorImplementationVAODSA(const GLuint index, const GLuint divisor) {
glVertexArrayBindingDivisor(_id, index, divisor);
}
#elif defined(MAGNUM_TARGET_GLES2)
void Mesh::vertexAttribDivisorImplementationANGLE(const GLuint index, const GLuint divisor) {
glVertexAttribDivisorANGLE(index, divisor);
}
#ifndef MAGNUM_TARGET_WEBGL
void Mesh::vertexAttribDivisorImplementationEXT(const GLuint index, const GLuint divisor) {
glVertexAttribDivisorEXT(index, divisor);
}
void Mesh::vertexAttribDivisorImplementationNV(const GLuint index, const GLuint divisor) {
glVertexAttribDivisorNV(index, divisor);
}
#endif
#endif
void Mesh::acquireVertexBuffer(Buffer&& buffer) {
(this->*Context::current().state().mesh.acquireVertexBufferImplementation)(std::move(buffer));
}
void Mesh::acquireVertexBufferImplementationDefault(Buffer&& buffer) {
/* The last added buffer should be this one, replace it with a owning one */
auto& attributes = *reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes);
CORRADE_INTERNAL_ASSERT(!attributes.empty() && attributes.back().buffer.id() == buffer.id() && buffer.id());
attributes.back().buffer.release(); /* so we swap back a zero ID */
attributes.back().buffer = std::move(buffer);
}
void Mesh::acquireVertexBufferImplementationVAO(Buffer&& buffer) {
CORRADE_INTERNAL_ASSERT(buffer.id());
/* With VAOs we are not maintaining the attribute list, so just store the
buffer directly */
reinterpret_cast<std::vector<Buffer>*>(&_attributes)->emplace_back(std::move(buffer));
}
void Mesh::bindIndexBufferImplementationDefault(Buffer&) {}
void Mesh::bindIndexBufferImplementationVAO(Buffer& buffer) {
bindVAO();
/* Binding the VAO in the above function resets element buffer binding,
meaning the following will always cause the glBindBuffer() to be called */
buffer.bindInternal(Buffer::TargetHint::ElementArray);
}
#ifndef MAGNUM_TARGET_GLES
void Mesh::bindIndexBufferImplementationVAODSA(Buffer& buffer) {
glVertexArrayElementBuffer(_id, buffer.id());
}
#endif
void Mesh::bindImplementationDefault() {
/* Specify vertex attributes */
for(AttributeLayout& attribute: *reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes))
vertexAttribPointer(attribute);
/* Bind index buffer, if the mesh is indexed */
if(_indexBuffer.id()) _indexBuffer.bindInternal(Buffer::TargetHint::ElementArray);
}
void Mesh::bindImplementationVAO() {
bindVAO();
}
void Mesh::unbindImplementationDefault() {
for(const AttributeLayout& attribute: *reinterpret_cast<std::vector<AttributeLayout>*>(&_attributes)) {
glDisableVertexAttribArray(attribute.location);
/* Reset also the divisor back so it doesn't affect */
if(attribute.divisor) {
#ifndef MAGNUM_TARGET_GLES2
glVertexAttribDivisor(attribute.location, 0);
#else
(this->*Context::current().state().mesh.vertexAttribDivisorImplementation)(attribute.location, 0);
#endif
}
}
}
void Mesh::unbindImplementationVAO() {}
#ifdef MAGNUM_TARGET_GLES
#if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
#if defined(MAGNUM_TARGET_WEBGL) && __EMSCRIPTEN_major__*10000 + __EMSCRIPTEN_minor__*100 + __EMSCRIPTEN_patch__ >= 13915
void Mesh::drawElementsBaseVertexImplementationANGLE(GLenum mode, GLsizei count, GLenum type, const void* indices, GLint baseVertex) {
glDrawElementsInstancedBaseVertexBaseInstanceANGLE(mode, count, type, indices, 1, baseVertex, 0);
}
#endif
void Mesh::drawElementsBaseVertexImplementationAssert(GLenum, GLsizei, GLenum, const void*, GLint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for indexed mesh draw with base vertex specification", );
}
#endif
#ifndef MAGNUM_TARGET_GLES2
#if defined(MAGNUM_TARGET_WEBGL) && __EMSCRIPTEN_major__*10000 + __EMSCRIPTEN_minor__*100 + __EMSCRIPTEN_patch__ >= 13915
void Mesh::drawRangeElementsBaseVertexImplementationANGLE(const GLenum mode, GLuint, GLuint, GLsizei count, GLenum type, const void* indices, GLint baseVertex) {
glDrawElementsInstancedBaseVertexBaseInstanceANGLE(mode, count, type, indices, 1, baseVertex, 0);
}
#endif
void Mesh::drawRangeElementsBaseVertexImplementationAssert(GLenum, GLuint, GLuint, GLsizei, GLenum, const void*, GLint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for indexed mesh draw with base vertex specification", );
}
void Mesh::drawArraysInstancedBaseInstanceImplementationAssert(GLenum, GLint, GLsizei, GLsizei, GLuint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for instanced mesh draw with base instance specification", );
}
#if !defined(MAGNUM_TARGET_WEBGL) || __EMSCRIPTEN_major__*10000 + __EMSCRIPTEN_minor__*100 + __EMSCRIPTEN_patch__ >= 13915
void Mesh::drawElementsInstancedBaseInstanceImplementationANGLE(const GLenum mode, const GLsizei count, const GLenum type, const void* const indices, const GLsizei instanceCount, const GLuint baseInstance) {
glDrawElementsInstancedBaseVertexBaseInstanceANGLE(mode, count, type, indices, instanceCount, 0, baseInstance);
}
#endif
void Mesh::drawElementsInstancedBaseInstanceImplementationAssert(GLenum, GLsizei, GLenum, const void*, GLsizei, GLuint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for instanced indexed mesh draw with base instance specification", );
}
void Mesh::drawElementsInstancedBaseVertexBaseInstanceImplementationAssert(GLenum, GLsizei, GLenum, const void*, GLsizei, GLint, GLuint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for instanced indexed mesh draw with base vertex and base instance specification", );
}
#if defined(MAGNUM_TARGET_WEBGL) && __EMSCRIPTEN_major__*10000 + __EMSCRIPTEN_minor__*100 + __EMSCRIPTEN_patch__ >= 13915
void Mesh::drawElementsInstancedBaseVertexImplementationANGLE(GLenum mode, GLsizei count, GLenum type, const void* indices, GLsizei instanceCount, GLint baseVertex) {
glDrawElementsInstancedBaseVertexBaseInstanceANGLE(mode, count, type, indices, instanceCount, baseVertex, 0);
}
#endif
void Mesh::drawElementsInstancedBaseVertexImplementationAssert(GLenum, GLsizei, GLenum, const void*, GLsizei, GLint) {
CORRADE_ASSERT_UNREACHABLE("GL::AbstractShaderProgram::draw(): no extension available for instanced indexed mesh draw with base vertex specification", );
}
#endif
#endif
}}