Added OpenGl_Context::GetBufferSubData() implementing getBufferSubData() based on capabilities of various APIs.
Added OpenGl_VertexBuffer::GetSubData() similar to OpenGl_VertexBuffer::SubData().
Graphic3d_TextureRoot::GetCompressedImage() - added new interface for fetching compressed texture image.
Default implementation detects DDS image files using Image_DDSParser parser.
Graphic3d_TextureRoot::GetImage() has been extended with new parameter
- the list of image formats supported by OpenGL driver.
Graphic3d_TextureRoot::convertToCompatible() implicitly converts
BGRA image to RGBA on OpenGL ES, which normally does not support BGR formats.
OpenGl_Caps::isTopDownTextureUV - new property defines how application defines
UV texture coordinates in primitive arrays.
OpenGl_Context::SetTextureMatrix() compares this flag with OpenGl_Texture::IsTopDown()
and automatically flips V coordinate in case of mismatch.
OpenGl_Texture now holds exact number of mipmap levels
instead of Boolean flag indicating that they are defined.
This allows loading DDS files with incomplete mipmap level set
by setting GL_TEXTURE_MAX_LEVEL to appropriate value instead of default 1000
(causing black textures in case if mipmap levels are not defined till 1x1).
Fixed order of texture coordinates transformation within GLSL program to match FFP matrix:
Rotate -> Translate -> Scale (previously Rotation was applied afterwards).
V3d_View::AutoZFit() is now called only before redraw
within methods V3d_View::Redraw() and V3d_View::Update().
Graphic3d_CView now holds Aspect_ExtendedRealitySession object.
Aspect_OpenVRSession implements new interface via optional OpenVR library.
Graphic3d_CView::ProcessInput() - added new interface method
which should be called for processing positional input (head tracking).
Graphic3d_Camera now allows setting custom stereoscopic Projection matrices.
OpenGl_Context::Camera() - context now holds Camera object
in addition to active camera matrices.
genproj.tcl has been extended to handle optional CSF_OpenVR dependency.
OpenGl_Sampler::applySamplerParams() has been corrected to check for OpenGL ES 3.0
when applying GL_TEXTURE_BASE_LEVEL/GL_TEXTURE_MAX_LEVEL parameters.
- Provide DumpJson for geometrical, ocaf and visualization classes;
- Change depth parameter of DumpJson (constant is not obligate here)
- Introduce a new macro for transient objects to be called as the first row in DumpJson: OCCT_DUMP_TRANSIENT_CLASS_BEGIN. We need not put the class name in the macro, using get_type_name of Standard_Transient for it.
- change implementation of OCCT_DUMP_CLASS_BEGIN and OCCT_DUMP_TRANSIENT_CLASS_BEGIN. It is not an sentry more and it does not create a new hierarchy level. It appends a new row into the output stream: "className": <className>
- OCCT_DUMP_* does not require semicolon
- class header is included first in source files of TDataStd, TDocStd, TCAFDoc
OpenGl_ShaderManager - metallic-roughness, emissive, occlusion
and normal texture maps are now supported by PBR.
Emissive, occlusion and normal texture maps are now supported by Phong shading model.
Path-Tracing now handles metallic-roughness and emissive texture maps.
Graphic3d_TextureUnit enumeration has been extended by
new values corresponding to supported texture maps.
OpenGl_TextureSet and OpenGl_ShaderProgram have been extended with
bitmask Graphic3d_TextureSetBits identifying texture slots read from GLSL Program
and slots defined within Texture Set to avoid undefined behavior by binding mock textures.
OpenGl_TextureSet now duplicates texture unit information to handle
textures shared across multiple slots (like Occlusion [R] + Metallic-Roughness [GB]).
OpenGl_Context::BindTextures() has been extended with active GLSL program paramter
to set mock textures to texture units used by program but undefined by texture set.
OpenGl_Workspace::ApplyAspects() has been extended with parameter to avoid bining texture set.
Metallic-Roughness shading model Graphic3d_TOSM_PBR has been implemented.
New materials descriptors Graphic3d_PBRMaterial have been added to Graphic3d_MaterialAspect.
PBR shading model requires OpenGL 3.0+ or OpenGL ES 3.0+ hardware.
Environment cubemap is expected to be provided for realistic look of metallic materials.
occLight_IsHeadlight() now returns bool instead of int.
Avoid using lowp for enumerations to workaround occLight_IsHeadlight()
ignorance on Adreno 308 caused by some GLSL optimizator bugs.
OpenGl_Texture::EstimatedDataSize() - fixed estimation for Cubemap textures.
OpenGl_Sampler::applySamplerParams() - fixed uninitialized GL_TEXTURE_WRAP_R in case of GL_TEXTURE_CUBE_MAP target.
Handled __EMSCRIPTEN__ macros to:
- Workaround atomics (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 is undefined, but GCC atomics are provided).
- Suppress non-standard header <sys/signal.h> warning.
- Return OSD_LinuxREDHAT.
- Avoid inclusion of XLib headers.
- Skip fontconfig library.
- Enable EGL+GLES path (translated by Emscripten into WebGL).
- Skip eglCreatePbufferSurface() not implemented by Emscripten EGL.
Fixed Graphic3d_Vec4.hxx usage within Quantity_ColorRGBA.hxx.
OpenGl_ShaderManager::defaultGlslVersion() now prefers GLSL 300 es when WebGL 2.0 is available,
as there no any OpenGL ES greater than 3.0 emulation so far.
Shaders_Declarations.glsl - added workaround for GLSL compilation on WebGL 1.0
by defining Light properties accessors as macros instead of functions
('[]' : Index expression must be constant).
OpenGl_FrameBuffer::Init() - added workaround for initialization of GL_DEPTH24_STENCIL8
depth-stencil attachment on WebGL 1.0 + GL_WEBGL_depth_texture extension.
OpenGl_Context::Vec4FromQuantityColor() now considers myIsSRgbActive flag
to handle use case, when Immediate Layer is drawn directly into window buffer,
which is not sRGB-ready.
Added new sample - OCCT WebGL viewer.
OpenGL rendering is now done into sRGB framebuffer.
OpenGl_ShaderManager::prepareStdProgramFboBlit() has been extended
by programs resolving MSAA texture and applying gamma correction as fallbacks.
Quantity_Color definition has been modified to store RGB components
in linear color space within Quantity_TOC_RGB type.
Standard colors defined by Quantity_NameOfColor enumeration has been updated accordingly.
New Quantity_TOC_sRGB type has been introduced to handle RGB components in non-linear sRGB color space.
OpenGl_TextureFormat class definition has been moved to dedicated files.
New method OpenGl_TextureFormat::FindFormat() replaces OpenGl_Texture::GetDataFormat().
New method OpenGl_TextureFormat::FindSizedFormat() replaces OpenGl_FrameBuffer::getColorDataFormat()
and OpenGl_FrameBuffer::getDepthDataFormat().
Graphic3d_TextureRoot::IsColorMap() - introduced new property defining
if RGB(A)8 image formats should be loaded as sRGB(A) textures or as data RGB(A) textures.
OpenGl_Texture initialization methods have been extended with new theIsColorMap argument.
vreadpixel - added argument -sRGB printing color in sRGB color space.
Test cases have been updated to new sRGB rendered results.
OpenGl_ShaderManager now provides fallback stipple lines GLSL code for obsolete OpenGL ES 2.0 devices.
OpenGl_Caps has been extended by flags disallowing OpenGL extensions usage
and restricting upper OpenGL version to be used by OCCT for testing purposes.
OpenGl_AspectsTextureSet now appends Sprite texture to the end of texture set.
OpenGl_Context::init() - fixed usage of GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS on too old GL context.
Default sampler names occSampler0, occActiveSampler and occSamplerBaseColor
are now excluded from header with common declarations for build-in GLSL programs.
OpenGl_ShaderObject::LoadAndCompile() and OpenGl_ShaderProgram::Link()
now includes program Id within error log.
OpenGl_ShaderManager now supports mapping texture onto point primitive within built-in programs
(texture transformation is ignored).
Graphic3d_AspectFillArea3d, Graphic3d_AspectLine3d, Graphic3d_AspectMarker3d
and Graphic3d_AspectText3d have been merged into new class Graphic3d_Aspects.
The old classes are preserved as dummy sub-classes of Graphic3d_Aspects
preserving different per-aspect defaults.
Methods IsGroupPrimitivesAspectSet(), GroupPrimitivesAspect(), FillAreaAspect(),
LineAspect() and MarkerAspect() have been removed from Graphic3d_Group.
Instead, a new method Graphic3d_Group::ReplaceAspects() has been introduced
for replacing existing group aspects.
AIS_Shape now uses new method AIS_InteractiveObject::replaceAspects()
for updating computed groups with new aspects without presentation recomputation
in places where SynchronizeAspects() is not applicable.
OpenGl_AspectFace, OpenGl_AspectLine, OpenGl_AspectMarker
and OpenGl_AspectText have been merged into new class OpenGl_Aspects.
ViewerTest::parseColor() - fix uninitialized alpha component.
Graphic3d_AspectText3d/Prs3d_TextAspect - removed unused properties Space, ExpansionFactor, Angle.
Remove getters Values() deprecated since OCCT 7.1.0.
Aspect_IS_HOLLOW now an alias to Aspect_IS_EMPTY and Aspect_IS_HIDDENLINE does not implicitly enables mesh edges,
so that Graphic3d_AspectFillArea3d::SetDrawEdges() should be set independently.
OpenGl_ShaderManager now provides built-in GLSL programs for drawing mesh edges
in single pass (and on OpenGL ES which does not provide glPolygonMode()).
Graphic3d_RenderingParams::ToEnableAlphaToCoverage is now enabled by default
and properly handled at TKOpenGl level - enables coverage for Graphic3d_AlphaMode_Mask primitives.
OpenGl_PrimitiveArray now uses GLSL programs instead of glPolygonMode() by default,
which can be managed by OpenGl_Caps::usePolygonMode flag (desktop OpenGL only).
glPolygonMode() is also used as fallback regardless OpenGl_Caps::usePolygonMode flag
when GLSL programs are not supported (Geometry Shaders are required)
or stipple line style is required (not implemented within Face GLSL).
vaspects command has been extended by -setInterior -setDrawEdges -setEdgeColor -setEdgeType -setEdgeWidth
arguments replacing vsetinteriorstyle/vsetedgetype/vunsetedgetype commands.
vaspects now accepts arguments without "set" prefix.
ViewerTest::ParseColor() now parses RGBA color.
Redundant command BUC60738 has been removed.
AIS_ColorScale - fixed usage of uninitialized FillArea aspects.
OpenGl_View::runPathtrace() has been extended with alternative multi-pass
Adaptive Screen Sampling mode, not relying on atomic floating point operations.
Although atomic operations on floats allows single-pass rendering,
such operations leads to instability in case of different calculation order.
Atomic float operations are also currently supported only by single GPU vendor.
Fixed GLSL compilation on Intel drivers (follow ARB_shader_image_load_store
specs rather than EXT_shader_image_load_store).
Graphic3d_RenderingParams::AdaptiveScreenSamplingAtomic option has been added
to activate 1-pass Adaptive Screen Sampling mode when supported by hardware.
vfps command has been extended with -duration argument allowing to limit command execution time.
vactivate command has been extended with -noUpdate argument.
Implemented workaround for dump images with width >= 5462 pix on Intel OpenGl driver.
Changes according to OpenGl_Context::myVendor field in lowercase.
Added new type of graphic3d limit Graphic3d_TypeOfLimit_HasFlatShading.
Added workaround for unexpected behaviour of mobile devices with Adreno GPU.
Added new complex flag hasFlatShading to OpenGl_Context for indicating support of flat shading.
OpenGl_Text now applies Polygon Offset instead of Z-shift in world coordinates for drawing background.
OpenGl_Context::SetPolygonOffset() - polygon offset state has been moved from OpenGl_Workspace to OpenGl_Context.
Graphic3d_RenderingParams::ToShowStats - new option displaying rendering statistics.
OpenGl_FrameStats - new class for accumulating frame statistics.
OpenGl_Context::FrameStats() provides an access to the frame stats
used for currently rendered context.
OpenGl_View::Redraw() and OpenGl_View::RedrawImmediate()
resets counters within OpenGl_Context::FrameStats().
OpenGl_Layer::UpdateCulling() - simplified resetting of culling state for cullable structures.
OpenGl_LayerList::Render() now handles new option Graphic3d_RenderingParams::ToEnableDepthPrepass
which prepends additional pass to rendering pipeline filling Depth Buffer in advance.
Graphic3d_AspectFillArea3d now stores array of textures.
Graphic3d_TextureParams stores texture unit for mapping texture.
OpenGl_Context::BindTextures() - context now manages the set of active textures.
Related code has been removed from OpenGl_Workspace.
OpenGl_Sampler has been extended to hold texture parameters structure.
OpenGl_Texture now holds OpenGl_Sampler instance as class field.
OpenGl_Texture inherits new class OpenGl_NamedResource and holds
texture identifier used for sharing resource in OpenGl_Context.
OpenGl_RaytraceGeometry now creates bindless textures taking
Sampler object directly from OpenGl_Texture.
OpenGl_Context::BindTextures() automatically recreates immutable
Sampler Object on texture parameters change.
Declared new structure OpenGl_ArbSamplerObject for platform-neutral
usage of related functionality.
Related functions are now loaded within OpenGL ES 3.0+.
Declarations.glsl - occActiveSampler has been renamed to occSampler0
with aliases occSamplerBaseColor (main) and occActiveSampler (for compatibility).
Additional texture samplers should be declared explicitly
within specific GLSL program as occSampler1, occSampler2, etc.
AIS_Shape and AIS_ColoredShape now computes Shaded presentation
with UV coordinates if texture mapping is enabled in Drawer.
vshaderprog now accepts Shader source code as parameter.
Weighted, Blended Order-Independent Transparency algorithm has been added rasterization pipeline.
In contrast to classical blending transparency it makes transparent objects look independent
from point of view. It also gives better depth occlusion when being used together with a weight factor
based on value of a GL depth buffer. The feature supports desktop OpenGL, OpenGL ES 3.0, ANGLE
and can be used together with MSAA on desktop GL.
To be used it require availability of:
1) Shaders pipeline.
2) Floating point color format for framebuffer (GL_ARB_color_buffer_float).
3) Multiple render targets (GL_ARB_draw_buffers).
Patch does not modify API and does not require application porting.
It adds new rendering options to Graphic3d_RenderingParams structure:
a) Transparency method from enumeration.
b) Scalar factor [0-1] controlling influence of a fragment's depth to its visibility.
Patch also simplifies processing of transparent objects for standard method:
rendering priority of transparent graphical structures is managed automatically,
therefore there is no need to care about it at application's side.
Graphic3d_RenderingParams::RenderResolutionScale - added new option
defining scale factor for allocating off-screen rendering buffers
relative to native resolution of window buffer.
Scale factor can be below 1.0 (lower resolution) or higher (as analog of super sampling),
but can not be combined with MSAA settings.
Draw Harness command vrenderparams has been extended with option -rendScale
managing introduced option Graphic3d_RenderingParams::RenderResolutionScale.
vcaps has been extended with option -useWindowBuffer for managing
OpenGl_Caps::useSystemBuffer option.
vrepaint has been extended with option -immediate
for testing immediate layer redraw
OpenGl_View::blitBuffers() - eliminate compiler warning on Android
FFP state management (light sources, matrices, clipping planes) has been
moved to OpenGl_ShaderManager for consistency with Programmable Pipeline.
OpenGl_Context::BindProgram() does not re-bind already active Program.
OpenGl_PrimitiveArray::Render() does not reset active Program at the end.
OpenGl_Context::ApplyModelViewMatrix() now checks if matrix differs
from already set one before modifying state in Shader Manager.
This allows avoing redundant state changes, matrix uploads onto GPU
and re-computation of inversed matrices.
NCollection_Mat4 has been extended with equality check operators for proper comparison.
OpenGl_ShaderManager - the tracking Material state has been added.
Removed unreachable states OPENGL_NS_RESMAT, OPENGL_NS_TEXTURE and OPENGL_NS_WHITEBACK.
Fixed resetting FFP material state after displaying GL_COLOR_ARRAY vertices;
the Material state within Shader Manager is now
invalidated within OpenGl_VertexBuffer::unbindFixedColor().
OpenGl_Workspace::ApplyAspectFace() - fixed invalidating Material State
when only Highlighting style is changing.
AIS_InteractiveContext - removed the following unused properties:
- PreSelectionColor(), DefaultColor(), WasCurrentTouched(), ZDetection().
AIS_InteractiveObject - removed unused property SelectionPriority().
Prs3d_Drawer - removed properties HighlightStyle() and SelectionStyle().
Graphic3d_HighlightStyle has been superseded by Prs3d_Drawer
inheriting from new class Graphic3d_PresentationAttributes.
Graphic3d_PresentationAttributes (as Graphic3d_HighlightStyle replacement)
has been extended with new properties:
- ZLayer() defining Z-Layer for highlighting presentation.
- DisplayMode() defining display mode for highlighting.
StdSelect_BRepSelectionTool methods have been corrected to take
SelectMgr_EntityOwner instead of StdSelect_BRepOwner.
StdSelect_Shape - duplicated field myDrawer has been dropped.
AIS_InteractiveObject - myDrawer->Color() is now used instead of myOwnColor,
myDrawer->Transparency() instead of myTransparency
and myDrawer->ZLayer() instead of myZLayer.
PrsMgr_PresentationManager::Unhighlight() now unhighlight all modes.
The method taking Mode as argument has been marked deprecated.
New enumeration Prs3d_TypeOfHighlight has been introduced
defining different highlight types.
AIS_InteractiveObject::HighlightStyle() now takes enumeration argument
and defines different styles for Global and Local selection.
ComesFromDecomposition() property has been moved
from StdSelect_BRepOwner to SelectMgr_EntityOwner.
- class Graphic3d_HatchStyle is added to provide a possibility to set up custom and predefined hatching;
- added the ability to set custom hatch patterns through bitmaps;
- test case for issue #28107
OpenGl_Workspace::BufferDump() now implicitly converts RGBA dump
into requested BGR, BGRA and RGB image.
DRAW command dversion is improved to report OpenGL variant used (desktop or ES); reporting of version of MSVC is corrected for VC14 and above; reporting of HAVE_OPENCL option is removed.
Usage of command vdump is corrected in some tests to specify extension .png for an image file.
Compiler warning is eliminated in OpenGl_Text.cxx (OpenGL ES mode only).
This commit provides useful functionality for path tracing rendering core.
1) Graphic3d_RenderingParams class was extended with additional AdaptiveScreenSampling option (disabled by default).
If this option is enabled, path tracing tries to adjust the number of samples for different screen areas.
In this way, the more complex areas (from the point of light conditions) are sampled more intensively,
while the simple areas are sampled very rarely.
For example, caustics and glossy reflections are typical candidates for more precise sampling.
In general, this allows to equalize image convergence and not to waste resources for already converged areas.
It is also possible to visualize sampling densities by enabling ShowSamplingTiles option
(activating and deactivating this option does not affect on the accumulated image).
2) Mixing OpenGL and ray-tracing output has been changed.
Now blending is performed using OpenGL functionality, while ray-tracing shaders only output correct Z-value.
Test case bugs vis bug27083 has been updated,
since the alpha value is now correctly set by Ray-Tracing to 1, opaque.
OpenGl_ShaderManager::prepareStdProgramFboBlit() now tries using extension
GL_EXT_frag_depth within OpenGL ES 2.0 when OpenGL ES 3.0 is not available.
OpenGl_View::blitBuffers() now disables Depth test
when copying depth values is not supported by OpenGL ES 2.0 hardware.
Fixed building for UWP with SDK 10.0.10240.0
Fixed building TKService, TKV3d and TKOpenGl for UWP.
OSD_Environment now defines global environment map
for emulating desktop behavior on UWP.
New method V3d_View::DiagnosticInformation() has been introduced
providing the access to low-level OpenGL context information
for diagnostic automated reports or displaying in application About System.
Graphic3d_Camera definition has been exended by optional Tile property (Graphic3d_CameraTile structure).
V3d_View::ToPixMap() now performs tiled dump when image size exceeds hardware limits.
OpenGl_View::Redraw() - fixed dump of immediate Z layers in no stereo and no MSAA case.
OpenGl_Context now tracks viewport values.
Draw Harness command vdump has been extended with new argument -tileSize.
Patch extends GL-state caching mechanism of OpenGl_Context by new methods.
The methods allow setting/inquiring polygon rasterization and hatching modes:
- OpenGl_Context::SetPolygonMode
- OpenGl_Context::SetPolygonHatchEnabled
- OpenGl_Context::SetPolygonHatchStyle
With these methods OpenGl_Text is able to configure shading as necessary.
And this configuration is done irrespectively of currently defined face aspect.
Code of OpenGl_Workspace is also modified to use these methods as well.
Porting notes:
- OpenGl_LineAttributes now require OpenGl_Context instance for calling GL API.
- OpenGl_LineAttributes has new flag IsEnabled, it turns on/off hatching without changing the hatch type.
By default this flag is turned on and can be never modified for compatibility with old code.
- OpenGl_LineAttributes is not anymore a field of OpenGl_Workspace::myLineAttrib.
This resource is directly created by an OpenGl_Context instance on demand.
If you use custom implementation of hatch patterns please create and share custom resource
under resource-key "OpenGl_LineAttributes" in corresponding OpenGl_Context before using
methods SetPolygonHatchEnabled, SetPolygonHatchStyle.
Quantity_ColorRGBA has been introduced as convenient structure holding Vec4 for OpenGL.
Graphic3d_PolygonOffset has been added as replacement for TEL_POFFSET_PARAM.
Duplicating definition of Hatch Styles TEL_HS_*** has been removed;
Aspect_HatchStyle enum now follows values of TEL_HS_*** for compatibility.
TelCullMode enum has been removed.
Aspect_AspectLine has been merged into Graphic3d_AspectLine3d.
Aspect_AspectMarker has been merged into Graphic3d_AspectMarker3d.
Aspect_AspectFillArea has been merged into Graphic3d_AspectFillArea3d.
Graphic3d_CAspectFillArea have been removed.
OpenGl_AspectLine now stores Graphic3d_AspectLine3d as class field.
OpenGl_AspectMarker now stores Graphic3d_AspectMarker3d as class field.
OpenGl_AspectText now stores Graphic3d_AspectText3d as class field.
OpenGl_AspectFace now stores Graphic3d_AspectFillArea3d as class field.
Graphic3d_AspectFillArea3d - back face culling is now enabled by default.
TKOpenGl now relies on Graphic3d_Group::IsClosed() flag to disable face culling.
StdPrs_ShadedShape now does not modify aspect for different culling modes.
Headers InterfaceGraphic_Graphic3d.hxx, InterfaceGraphic_telem.hxx, InterfaceGraphic_tgl_all.hxx
defining obsolete structures CALL_DEF_COLOR, CALL_DEF_POINT,
CALL_DEF_MATERIAL, CALL_DEF_TRANSFORM_PERSISTENCE, TEL_POINT, TEL_COLOUR
have been removed.
Useless and broken test case bugs/vis/buc60821 has been removed.
OpenGl_Workspace::myAspectFaceApplied and myAspectMarkerApplied have been replaced
from OpenGl_AspectFace*/OpenGl_AspectMarker*
to Handle(Graphic3d_AspectFillArea3d)/Handle(Graphic3d_AspectMarker3d).
This eliminates reading from freed memory
(e.g. when OpenGl_AspectFace is allocated on stack like in OpenGl_Trihedron).
OpenGl_PrimitiveArray::drawEdges() - fix drawing non-indexed array from VBO (access violation due to NULL handle).
AIS_Dimension::DrawArrow() - added missing initialization of 3D arrow aspect.
AIS_Manipulator::Compute() now creates dedicated Face Aspect for each axis.
V3d_CircularGrid, V3d_RectangularGrid now create dedicated line aspects with different color.
AIS_InteractiveObject::SetMaterial() - do not modify global ShadingAspect.
OpenGl_ShaderManager::pointSpriteAlphaSrc() now does not return alpha from Red channel
for RGBA marker texture in Core profile.
OpenGl_ShaderManager::prepareStdProgramFlat() - restored code for drawing points without texture.
Built-in GLSL programs now flip .y in shaders instead of
relying on GL_POINT_SPRITE_COORD_ORIGIN unavailable on OpenGL ES.
Added sample markers.tcl (moved from test cases).
Sample now includes marker_kr.png for testing marker orientation.
Shader rendering of point sprites with per-vertex colors and shading have been fixed.
Material state was removed from OpenGl_ShaderManager.
Material properties now should be modified trough OpenGl_Context::SetShadingMaterial().
Operator of cast to non-const reference is declared deprecated to produce compiler warning if used (usually implicitly).
OCCT code is updated to avoid that cast, occurring when function accepting non-const reference to handle is called with handle to derived type.
For that, local variable of argument type is passed instead, and down-cast is used to get it to desired type after the call.
A few occurrences of use of uninitialized variable are corrected.
Add a new arbTexFloat extension in OpenGl_Context.
Add a new prototype glTexImage in OpenGl_GlFunctions.
Push error message if glTexImage3D is unavailable.
