gl Namespace Reference

Classes
class	ShaderProgram
	GLSL shader program wrapper (shared-ownership). More...
class	GLText
	Render SDL_ttf text into an OpenGL texture and display it on screen. More...
class	GLSprite
	A textured screen-space quad drawn with an OpenGL shader. More...
class	GLWindow
	SDL2 + OpenGL/ES window with event loop and console support. More...
class	GLObject
	Abstract interface for scene objects managed by a GLWindow. More...

Enumerations
enum class	GLMode { DESKTOP , ES }
	OpenGL mode: desktop GL or OpenGL ES. More...

Functions
GLuint	loadTexture (const std::string &filename)
	Load a GL texture from a file.
GLuint	loadTexture (const std::string &filename, int &w, int &h)
	Load a GL texture from a file and retrieve its dimensions.
GLuint	createTexture (SDL_Surface *surface, bool flip)
	Create a new GL texture from an SDL_Surface.
GLuint	createTexture (void *buffer, int width, int height)
	Create a new GL texture from a raw pixel buffer.
void	updateTexture (GLuint texture, SDL_Surface *surface, bool flip)
	Replace a GL texture's contents from an SDL_Surface.
SDL_Surface *	createSurface (int w, int h)
	Allocate a blank RGBA SDL_Surface.

Variables
const char *	vSource
	Default vertex shader source.
const char *	fSource
	Default fragment shader source.
const char *	ftSource

Enumeration Type Documentation

GLMode

enum class gl::GLMode

strong

OpenGL mode: desktop GL or OpenGL ES.

Enumerator
DESKTOP
ES

Definition at line 398 of file gl.hpp.

Function Documentation

createSurface()

SDL_Surface * gl::createSurface	(	int	w,
		int	h )

Allocate a blank RGBA SDL_Surface.

Parameters

w	Width in pixels.
h	Height in pixels.

Returns

Newly allocated surface (caller owns it).

Definition at line 811 of file gl.cpp.

createTexture() [1/2]

GLuint gl::createTexture	(	SDL_Surface *	surface,
		bool	flip )

Create a new GL texture from an SDL_Surface.

Parameters

surface	Source surface.
flip	If true, flip vertically.

Returns

New GL texture ID.

Definition at line 743 of file gl.cpp.

References mx::Texture::flipSurface().

Referenced by mx::MXCapture::createImage().

createTexture() [2/2]

GLuint gl::createTexture	(	void *	buffer,
		int	width,
		int	height )

Create a new GL texture from a raw pixel buffer.

Parameters

buffer	Pointer to RGBA data.
width	Image width.
height	Image height.

Returns

New GL texture ID.

Definition at line 778 of file gl.cpp.

loadTexture() [1/2]

GLuint gl::loadTexture

(

const std::string &

filename

)

Load a GL texture from a file.

Parameters

filename

Image file path.

Returns

GL texture ID.

Definition at line 689 of file gl.cpp.

References mx::Texture::flipSurface(), and png::LoadPNG().

Referenced by gl::GLSprite::loadTextureImpl(), gl::GLSprite::loadTextureImpl(), mx::Model::setTextures(), and mx::Model::setTexturesFromMTL().

loadTexture() [2/2]

GLuint gl::loadTexture	(	const std::string &	filename,
		int &	w,
		int &	h )

Load a GL texture from a file and retrieve its dimensions.

Parameters

filename	Image file path.
w	Output: width.
h	Output: height.

Returns

GL texture ID.

Definition at line 717 of file gl.cpp.

References mx::Texture::flipSurface(), and png::LoadPNG().

updateTexture()

void gl::updateTexture	(	GLuint	texture,
		SDL_Surface *	surface,
		bool	flip )

Replace a GL texture's contents from an SDL_Surface.

Parameters

texture	Target GL texture ID.
surface	Source surface.
flip	If true, flip vertically before uploading.

Definition at line 795 of file gl.cpp.

References mx::Texture::flipSurface().

Variable Documentation

fSource

const char * gl::fSource

Initial value:

                   = R"(#version 330 core
    in vec2 TexCoord;
    out vec4 FragColor;
    uniform sampler2D textTexture; 
    void main() {
        FragColor = texture(textTexture, TexCoord);
    }
)"

Default fragment shader source.

Definition at line 862 of file gl.cpp.

Referenced by console::GLConsole::load().

ftSource

const char* gl::ftSource

Initial value:

                    = R"(#version 330 core
    in vec2 TexCoord;
    out vec4 FragColor;
    uniform sampler2D textTexture; 
    void main() {
        FragColor = texture(textTexture, TexCoord);
        if(FragColor.a < 0.1)
            discard;
    }
)"

Definition at line 870 of file gl.cpp.

Referenced by gl::GLText::init().

vSource

const char * gl::vSource

Initial value:

                   = R"(#version 330 core
    layout (location = 0) in vec3 aPos;
    layout (location = 1) in vec2 aTexCoord;
    out vec2 TexCoord;
    void main() {
        gl_Position = vec4(aPos, 1.0); 
        TexCoord = aTexCoord;        
    }
)"

Default vertex shader source.

Definition at line 853 of file gl.cpp.

Referenced by gl::GLText::init(), and console::GLConsole::load().