This namespace contains underlying graphics library functions. More...

Namespaces
	TextureUnit

	UBOBindingPoint

Classes
class	FrameBuffer
	This is a frame buffer object that can be used for render to texture tasks. More...

class	QuadTextureCoords

class	QuadVertices

class	Shader

Functions
void	Clear ()
	Clears the window pointed by the active context. More...

void	CopyToTexture (Texture texture, const Containers::Image &data, Geometry::Bounds source, Geometry::Point target)
	Copies the data from the given image to the texture starting from specified boundary of the given target. More...

void	CopyToTexture (Texture texture, const Containers::Image &data, Geometry::Point target)
	Copies the data from the given image to the texture starting from the given target. More...

GLuint	CreateShader (GLenum type, const std::string &code, const std::string &name)

void	debug_proc (GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar message, const void )

void	DestroyTexture (Texture texture)
	Destroys the given texture. More...

Texture	GenerateEmptyTexture (const Geometry::Size &size, Graphics::ColorMode mode)
	This function generates a texture from the given image data. More...

Texture	GenerateTexture (const Containers::Image &data)
	This function generates a texture from the given image data. More...

GLenum	getGLColorMode (Graphics::ColorMode mode)

void	InsertDefines (std::string &code, const std::string &shader_defines)

void	LoadFunctions ()

QuadVertices	operator* (const Geometry::Transform3D &transform, const QuadVertices &quad)

void	RenderToScreen ()
	Stops rendering to a texture and start rendering to a buffer. More...

void	RenderToTexture (FrameBuffer &buffer)
	Begins using the given frame buffer. More...

void	Resize (const Geometry::Size &size)
	Resizes the active context. More...

void	ResizeTexture (Texture texture, const Geometry::Size &size, Graphics::ColorMode mode)
	Resizes the given texture to the specified size. More...

void	SetDefaultBlending ()
	Sets default blending parameters as current. More...

void	SetDefaultClear ()
	Sets default clear parameters as current. More...

void	settexturedata (Texture tex, const Containers::Image &data)

void	SetupContext (const Geometry::Size &size)
	Performs first time initialization on GL context. More...

unsigned int	SetupUBO (int size, int binding_point)

void	UpdateTexture (Texture texture, const Containers::Image &data)
	Updates the given texture to contain the given data. More...

void	UpdateUBO (unsigned int ubo, int size, void const *const data)

Variables
GLuint	activeprogram

Gorgon::Utils::Logger	log
	The logger that is used for GL operations. Default is unset and will not log anything. Use Initialize... to begin logging. More...

Detailed Description

This namespace contains underlying graphics library functions.

These functions are presented in a OS/Window manager generic way. However, direct access to GL functions might be necessary in many cases. In those cases you may include GL/OpenGL.h library header. This header might expose operating system dependent headers. In the future there might be more supported GL libraries. In that case, you should choose to include the library you wish to use.

Function Documentation

◆ Clear()

void Clear ( )

Clears the window pointed by the active context.

◆ CopyToTexture() [1/2]

void CopyToTexture	(	Texture	texture,
		const Containers::Image &	data,
		Geometry::Bounds	source,
		Geometry::Point	target
	)

Copies the data from the given image to the texture starting from specified boundary of the given target.

References getGLColorMode(), basic_Image< T_ >::GetMode(), basic_Image< T_ >::GetWidth(), basic_Bounds< T_ >::Height(), basic_Bounds< T_ >::Left, basic_Image< T_ >::RawData(), basic_Bounds< T_ >::Top, basic_Bounds< T_ >::Width(), basic_Point< T_ >::X, and basic_Point< T_ >::Y.

◆ CopyToTexture() [2/2]

void CopyToTexture	(	Texture	texture,
		const Containers::Image &	data,
		Geometry::Point	target
	)

Copies the data from the given image to the texture starting from the given target.

References getGLColorMode(), basic_Image< T_ >::GetHeight(), basic_Image< T_ >::GetMode(), basic_Image< T_ >::GetWidth(), basic_Image< T_ >::RawData(), basic_Point< T_ >::X, and basic_Point< T_ >::Y.

◆ CreateShader()

GLuint Gorgon::GL::CreateShader	(	GLenum	type,
		const std::string &	code,
		const std::string &	name
	)

◆ debug_proc()

void Gorgon::GL::debug_proc	(	GLenum	source,
		GLenum	type,
		GLuint	id,
		GLenum	severity,
		GLsizei	length,
		const GLchar *	message,
		const void *
	)

◆ DestroyTexture()

void DestroyTexture ( Texture texture )

Destroys the given texture.

◆ GenerateEmptyTexture()

Texture GenerateEmptyTexture	(	const Geometry::Size &	size,
		Graphics::ColorMode	mode
	)

This function generates a texture from the given image data.

References getGLColorMode(), basic_Size< T_ >::Height, and basic_Size< T_ >::Width.

◆ GenerateTexture()

Texture GenerateTexture ( const Containers::Image & data )

This function generates a texture from the given image data.

References settexturedata().

◆ getGLColorMode()

GLenum Gorgon::GL::getGLColorMode ( Graphics::ColorMode mode )

References Gorgon::Graphics::Alpha, GL_BGR, GL_BGRA, Gorgon::Graphics::Grayscale, Gorgon::Graphics::Invalid, Gorgon::Graphics::RGB, and Gorgon::Graphics::RGBA.

◆ InsertDefines()

void Gorgon::GL::InsertDefines	(	std::string &	code,
		const std::string &	shader_defines
	)

◆ LoadFunctions()

void Gorgon::GL::LoadFunctions ( )

References glActiveTexture, glAttachShader, glBindAttribLocation, glBindBuffer, glBindBufferBase, glBindFramebuffer, glBindRenderbuffer, glBindVertexArray, glBlendFuncSeparate, glBufferData, glBufferSubData, glCheckFramebufferStatus, glCompileShader, glCreateProgram, glCreateShader, glDebugMessageCallback, glDeleteBuffers, glDeleteFramebuffers, glDeleteProgram, glDeleteRenderbuffers, glDeleteShader, glDeleteVertexArrays, glDetachShader, glDrawBuffers, glEnableVertexAttribArray, glFramebufferRenderbuffer, glFramebufferTexture2D, glGenBuffers, glGenerateMipmap, glGenFramebuffers, glGenRenderbuffers, glGenVertexArrays, glGetAttribLocation, glGetProgramInfoLog, glGetProgramiv, glGetShaderInfoLog, glGetShaderiv, glGetUniformBlockIndex, glGetUniformLocation, glLinkProgram, glMapBuffer, glMapBufferRange, glRenderbufferStorage, glShaderSource, glUniform1f, glUniform1i, glUniform2fv, glUniform3fv, glUniform4fv, glUniformBlockBinding, glUniformMatrix3fv, glUniformMatrix3x2fv, glUniformMatrix4fv, glUniformMatrix4x2fv, glUniformMatrix4x3fv, glUnmapBuffer, glUseProgram, glVertexAttribIPointer, glVertexAttribPointer, and FrameBuffer::HardwareSupport.

◆ operator*()

QuadVertices Gorgon::GL::operator*	(	const Geometry::Transform3D &	transform,
		const QuadVertices &	quad
	)

◆ RenderToScreen()

void RenderToScreen ( )

Stops rendering to a texture and start rendering to a buffer.

References glBindFramebuffer.

◆ RenderToTexture()

void RenderToTexture ( FrameBuffer & buffer )

Begins using the given frame buffer.

References FrameBuffer::Use().

◆ Resize()

void Resize ( const Geometry::Size & size )

Resizes the active context.

References basic_Size< T_ >::Height, and basic_Size< T_ >::Width.

◆ ResizeTexture()

void ResizeTexture	(	Texture	texture,
		const Geometry::Size &	size,
		Graphics::ColorMode	mode
	)

Resizes the given texture to the specified size.

The data in the texture cannot be trusted after this call.

References getGLColorMode(), basic_Size< T_ >::Height, and basic_Size< T_ >::Width.

◆ SetDefaultBlending()

void SetDefaultBlending ( )

Sets default blending parameters as current.

References glBlendFuncSeparate.

◆ SetDefaultClear()

void SetDefaultClear ( )

Sets default clear parameters as current.

◆ settexturedata()

void Gorgon::GL::settexturedata	(	Texture	tex,
		const Containers::Image &	data
	)

References getGLColorMode(), basic_Image< T_ >::GetMode(), basic_Image< T_ >::GetSize(), basic_Size< T_ >::Height, basic_Image< T_ >::RawData(), and basic_Size< T_ >::Width.

◆ SetupContext()

void SetupContext ( const Geometry::Size & size )

Performs first time initialization on GL context.

References Clear(), debug_proc(), Gorgon::OS::DisplayMessage(), GL_DEBUG_OUTPUT, glDebugMessageCallback, Resize(), SetDefaultBlending(), and SetDefaultClear().

◆ SetupUBO()

unsigned int SetupUBO	(	int	size,
		int	binding_point
	)

References glBindBuffer, glBindBufferBase, glBufferData, and glGenBuffers.

◆ UpdateTexture()

void UpdateTexture	(	Texture	texture,
		const Containers::Image &	data
	)

Updates the given texture to contain the given data.