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0031477: Visualization, TKOpenGl - fetch/wrap getBufferSubData() function from WebGL 2.0

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Added OpenGl_Context::GetBufferSubData() implementing getBufferSubData() based on capabilities of various APIs.
Added OpenGl_VertexBuffer::GetSubData() similar to OpenGl_VertexBuffer::SubData().
This commit is contained in:
kgv
2020-05-28 19:42:13 +03:00
committed by bugmaster
parent 872f98d9ef
commit d4cefcc0da
7 changed files with 179 additions and 0 deletions
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12
src/OpenGl/OpenGl_Context.hxx
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@@ -987,6 +987,17 @@ public: //! @name methods to alter or retrieve current state
//! Set line feater width.
void SetLineFeather(Standard_ShortReal theValue) { myLineFeather = theValue; }
//! Wrapper over glGetBufferSubData(), implemented as:
//! - OpenGL 1.5+ (desktop) via glGetBufferSubData();
//! - OpenGL ES 3.0+ via glMapBufferRange();
//! - WebGL 2.0+ via gl.getBufferSubData().
//! @param theTarget [in] target buffer to map
//! @param theOffset [in] offset to the beginning of sub-data
//! @param theSize [in] number of bytes to read
//! @param theData [out] destination pointer to fill
//! @return FALSE if functionality is unavailable
Standard_EXPORT bool GetBufferSubData (GLenum theTarget, GLintptr theOffset, GLsizeiptr theSize, void* theData);
//! Return Graphics Driver's vendor.
const TCollection_AsciiString& Vendor() const { return myVendor; }
@@ -1044,6 +1055,7 @@ public: //! @name core profiles
public: //! @name extensions
Standard_Boolean hasGetBufferData; //!< flag indicating if GetBufferSubData() is supported
Standard_Boolean hasHighp; //!< highp in GLSL ES fragment shader is supported
Standard_Boolean hasUintIndex; //!< GLuint for index buffer is supported (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_element_index_uint)
Standard_Boolean hasTexRGBA8; //!< always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8