A very small and simple PC/MAC/DS rendering lib using the 3d core to render 2D stuff. More...

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <libraries/include/GL/glfw.h>

Classes
struct	glImage
	Struct for our GL-Based Images This is our struct to hold our image attributes. You don't need to worry about this if you use the texture packer. More...
Defines
#define	ARGB_A(u) (((u) >> 24) & 0x000000FF)
#define	ARGB_R(u) (((u) >> 16) & 0x000000FF)
#define	ARGB_G(u) (((u) >> 8) & 0x000000FF)
#define	ARGB_B(u) (((u) >> 0) & 0x000000FF)
#define	RGBA(r, g, b, a) ((a) << 24 \| (r) << 16 \| (g) << 8 \| (b) )
#define	GL2D_RGBA(r, g, b, a) RGBA( b, g, r, a)
	Macro to use for all the color arguments of Easy GL2D primitives.
#define	true 1
#define	false 0
Typedefs
typedef enum GL2D_FLIP_MODE	GL2D_FLIP_MODE
	Enums selecting flipping mode.
typedef enum GL2D_BLEND_MODE	GL2D_BLEND_MODE
	Enums selecting Blending/Blitting mode.
typedef struct glImage	glImage
	Struct for our GL-Based Images This is our struct to hold our image attributes. You don't need to worry about this if you use the texture packer.
Enumerations
enum	GL2D_FLIP_MODE { GL2D_FLIP_NONE = 1 << 0, GL2D_FLIP_V = 1 << 1, GL2D_FLIP_H = 1 << 2 }
	Enums selecting flipping mode. More...
enum	GL2D_BLEND_MODE { GL2D_TRANS = 0, GL2D_SOLID, GL2D_BLENDED, GL2D_GLOW, GL2D_ALPHA, GL2D_BLACK }
	Enums selecting Blending/Blitting mode. More...
Functions
void	glBegin2D (const int width, const int height)
	Sets up OpenGL for 2d rendering. Call this before drawing any of GL2D's drawing or sprite functions.
void	glEnd2D ()
	Issue this after drawing 2d so that we don't mess the matrix stack. The compliment of glBegin2D().
void	glScreen2D (const int width, const int height, const int mode)
	Initializes GL in 2D mode.
void	glScreen2DEx (const int width, const int height, const int mode, const int depthbits, const int stencilbits)
	Initializes GL in 2D mode with more control.
void	glClose ()
	Cleans up Easy GL2D. Call this at program end. External texture management is up for the user to clean up.
void	glBlendMode (const GL2D_BLEND_MODE mode)
	Sets the default blending/blitting mode.
void	glEnableSpriteStencil (const GLuint gl2dcolor, const GLuint gl2dcolor_env, int flag)
	Sets texture environment color Used to draw sprites in a single fill color Very useful for flash/hit animations (1 - (texture image color)) * (glColor color) + (texture image color) * (texture environment color) ie. Pure White Sprites.
void	glEnableAntialias (int flag)
void	glClearScreen ()
	Clears the GL2D screen buffer.
void	glLineGlow (const int x1, const int y1, const int x2, const int y2, const int width, const GLuint color)
	Draws a glowing line.
void	glPutPixel (int x, int y, const GLuint color)
	Draws a Pixel.
void	glLine (int x1, int y1, int x2, int y2, const GLuint color)
	Draws a Line.
void	glLineGradient (int x1, int y1, int x2, int y2, const GLuint color1, const GLuint color2)
	Draws a Line in a gradient color.
void	glBox (int x1, int y1, int x2, int y2, const GLuint color)
	Draws a Box.
void	glBoxFilled (int x1, int y1, int x2, int y2, const GLuint color)
	Draws a Box filled with a single color.
void	glBoxFilledGradient (int x1, int y1, int x2, int y2, const GLuint color1, const GLuint color2, const GLuint color3, const GLuint color4)
	Draws a Box filled with a gradient color.
void	glTriangle (int x1, int y1, int x2, int y2, int x3, int y3, const GLuint color)
	Draws a Triangle.
void	glTriangleFilled (int x1, int y1, int x2, int y2, int x3, int y3, const GLuint color)
	Draws a Triangle filled with a single color.
void	glTriangleFilledGradient (int x1, int y1, int x2, int y2, int x3, int y3, const GLuint color1, const GLuint color2, const GLuint color3)
	Draws a Triangle filled with a gradient color.
void	glEllipse (int x, int y, int a, int b, int degrees, const GLuint color)
	Draws a hollow Ellipse.
void	glEllipseFilled (int x, int y, int a, int b, int degrees, const GLuint color)
	Draws a filled Ellipse.
void	glSprite (const int x, const int y, const int flipmode, const glImage *spr)
	Draws a Sprite.
void	glSpriteScale (const int x, const int y, const float scale, const int flipmode, const glImage *spr)
	Draws a Scaled Sprite.
void	glSpriteScaleXY (const int x, const int y, const float scaleX, const float scaleY, const int flipmode, const glImage *spr)
	Draws an Axis Exclusive Scaled Sprite.
void	glSpriteRotate (const int x, const int y, const int angle, const int flipmode, const glImage *spr)
	Draws a Center Rotated Sprite.
void	glSpriteRotateScale (const int x, const int y, const int angle, const float scale, const int flipmode, const glImage *spr)
	Draws a Center Rotated Scaled Sprite.
void	glSpriteRotateScaleXY (const int x, const int y, const int angle, const float scaleX, const float scaleY, const int flipmode, const glImage *spr)
	Draws a Center Rotated Axis-Exclusive Scaled Sprite.
void	glSpriteOnQuad (int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4, float uoff, float voff, int flipmode, const glImage *spr)
	Draws a Stretched Sprite across a quad Useful for "Shrearing Effects".
void	glSpriteOnQuadClipped (int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4, float luclip, float lvclip, float ruclip, float rvclip, int flipmode, const glImage *spr)
	Draws a Stretched Sprite across a quad with clipped textures<Br> I needed this for my ikaruga laser implementation.
void	glSpriteStretchHorizontal (int x, int y, int length, const glImage *spr)
	Draws a clean horizontally stretched Sprite<Br> Useful for lasers and huds.
void	glSpriteStretchVertical (int x, int y, int height, const glImage *spr)
	Draws a clean vertically stretched Sprite<Br> Useful for lasers and huds.
void	glSpriteStretchHV (int x, int y, int length, int height, const glImage *spr)
	Draws a clean horizontally and vertically stretched Sprite<Br> Useful for lasers, huds and dialog boxes.
void	glPrint (int x, int y, const char *text, const GLuint color)
	Prints a rudimentary text for feedback/debugging purposes<Br> Not to be used in actual application/games as it is extremely sloooow. Rasterfont from the GLRedbook.
GLuint	glLoadSpriteSet (const char filename, glImage sprite, const int width, const int height, const int numframes, const unsigned int *texcoords, const GLuint filtermode)
	Initializes our spriteset with Texture Packer generated UV coordinates Very safe and easy to use..
GLuint	glLoadTileSet (const char filename, glImage sprite, const int tile_wid, const int tile_hei, const int bmp_wid, const int bmp_hei, const GLuint filtermode)
	Initializes our Tileset (like glInitSpriteset()) but without the use of Texture Packer auto-generated files. Can only be used when tiles in a tilset are of the same dimensions.
GLuint	glLoadSprite (const char filename, glImage sprite, const int width, const int height, const GLuint filtermode)
	Loads a single power of 2 image.
void	glGet (glImage SpriteDest, const glImage SpriteSource, int x1, int y1, int x2, int y2)
	"Gets" a tile from a loaded spriteset.

Detailed Description

A very small and simple PC/MAC/DS rendering lib using the 3d core to render 2D stuff.

Definition in file gl2d.h.

Define Documentation

#define GL2D_RGBA	(	r,
		g,
		b,
		a
	)	RGBA( b, g, r, a)

Macro to use for all the color arguments of Easy GL2D primitives.

Parameters:

r	Red channnel of the 32 bit color (0-255).
g	Green channnel of the 32 bit color (0-255).
b	Blue channnel of the 32 bit color (0-255).
a	Alpha channnel of the 32 bit color (0-255).

Definition at line 71 of file gl2d.h.

Typedef Documentation

typedef enum GL2D_BLEND_MODE GL2D_BLEND_MODE

Enums selecting Blending/Blitting mode.

typedef enum GL2D_FLIP_MODE GL2D_FLIP_MODE

Enums selecting flipping mode.

These enums are bits for flipping the sprites.
You can "|" (or) GL_FLIP_V and GL_FLIP_H to flip both ways.

Related functions:

typedef struct glImage glImage

Struct for our GL-Based Images
This is our struct to hold our image attributes. You don't need to worry about this if you use the texture packer.

Struct for out GL-Based Images.

This is our struct to hold our image attributes.
You don't need to worry about this if you use the texture packer.

Related functions:

Enumeration Type Documentation

enum GL2D_BLEND_MODE

Enums selecting Blending/Blitting mode.

Enumerator:

GL2D_TRANS	Transparent blit
GL2D_SOLID	Solid blit
GL2D_BLENDED	Alpha Blended blit
GL2D_GLOW	Additive Blended blit
GL2D_ALPHA	Alpha Transparent blit
GL2D_BLACK	Black color blit

Definition at line 117 of file gl2d.h.

enum GL2D_FLIP_MODE

Enums selecting flipping mode.

These enums are bits for flipping the sprites.
You can "|" (or) GL_FLIP_V and GL_FLIP_H to flip both ways.

Related functions:

Definition at line 103 of file gl2d.h.

Function Documentation

void glBegin2D	(	const int	width,
		const int	height
	)

Sets up OpenGL for 2d rendering.
Call this before drawing any of GL2D's drawing or sprite functions.

Parameters:

width	width of the window.
height	height of the window.

Definition at line 61 of file gl2d.c.

void glBlendMode ( const GL2D_BLEND_MODE mode )

Sets the default blending/blitting mode.

Parameters:

mode	enums for blending see example files.

Definition at line 631 of file gl2d.c.

void glBox	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		const GLuint	color
	)

Draws a Box.

Parameters:

x1,y1	Top-Left coordinate of the box.
x2,y2	Bottom-Right coordinate of the box.
color	GL2D_RGBA color.

Definition at line 845 of file gl2d.c.

void glBoxFilled	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		const GLuint	color
	)

Draws a Box filled with a single color.

Parameters:

x1,y1	Top-Left coordinate of the box.
x2,y2	Bottom-Right coordinate of the box.
color	GL2D_RGBA color.

Definition at line 869 of file gl2d.c.

void glBoxFilledGradient	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		const GLuint	color1,
		const GLuint	color2,
		const GLuint	color3,
		const GLuint	color4
	)

Draws a Box filled with a gradient color.

Parameters:

x1,y1	Top-Left coordinate of the box.
x2,y2	Bottom-Right coordinate of the box.
color1	GL2D_RGBA color of the Top-Left corner.
color2	GL2D_RGBA color of the Bottom-Left corner.
color3	GL2D_RGBA color of the Bottom-Right corner.
color4	GL2D_RGBA color of the Top-Right corner.

Definition at line 898 of file gl2d.c.

void glEllipse	(	int	x,
		int	y,
		int	a,
		int	b,
		int	degrees,
		const GLuint	color
	)

Draws a hollow Ellipse.

Parameters:

x,y	Center of the ellipse.
a	Semi-major axis.
b	Semi-minor.
degrees	Angle(in degrees).
color	GL2D_RGBA color of the ellipse.

Definition at line 994 of file gl2d.c.

void glEllipseFilled	(	int	x,
		int	y,
		int	a,
		int	b,
		int	degrees,
		const GLuint	color
	)

Draws a filled Ellipse.

Parameters:

x,y	Center of the ellipse.
a	Semi-major axis.
b	Semi-minor.
degrees	Angle(in degrees).
color	GL2D_RGBA color of the ellipse.

Definition at line 1060 of file gl2d.c.

void glEnableAntialias ( int flag )

Enables or disables AA depending on the switch param flag true == enable; false(0) == disable.

Definition at line 157 of file gl2d.c.

void glEnableSpriteStencil	(	const GLuint	gl2dcolor,
		const GLuint	gl2dcolor_env,
		int	flag
	)

Sets texture environment color Used to draw sprites in a single fill color Very useful for flash/hit animations (1 - (texture image color)) * (glColor color) + (texture image color) * (texture environment color) ie. Pure White Sprites.

Parameters:

gl2dcolor	color.
gl2dcolor_env	environment color.
flag	true == blendmode; false(0) == modulate.

Definition at line 129 of file gl2d.c.

void glGet	(	glImage *	SpriteDest,
		const glImage *	SpriteSource,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

"Gets" a tile from a loaded spriteset.

Parameters:

SpriteDest	Destination pointer to an array of glImage.
SpriteSource	Source pointer to an array of glImage.
x1,y1	Top-Left coordinate of the image to "get".
x2,y2	Bottom-Right coordinate of the image to "get".

Definition at line 2088 of file gl2d.c.

void glLine	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		const GLuint	color
	)

Draws a Line.

Parameters:

x1,y1	Start point of the line.
y2,y2	End point of the line.
color	GL2D_RGBA color.

Definition at line 805 of file gl2d.c.

void glLineGlow	(	const int	x1,
		const int	y1,
		const int	x2,
		const int	y2,
		const int	width,
		const GLuint	color
	)

Draws a glowing line.

Parameters:

x1,y1	Start point of the line.
y2,y2	End point of the line.
width	Thickness of the line.
color	GL2D_RGBA color.

Definition at line 690 of file gl2d.c.

void glLineGradient	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		const GLuint	color1,
		const GLuint	color2
	)

Draws a Line in a gradient color.

Parameters:

x1,y1	Start point of the line.
y2,y2	End point of the line.
color1	Start point GL2D_RGBA color .
color2	End point GL2D_RGBA color .

Definition at line 825 of file gl2d.c.

GLuint glLoadSprite	(	const char *	filename,
		glImage *	sprite,
		const int	width,
		const int	height,
		const GLuint	filtermode
	)

Loads a single power of 2 image.

Parameters:

filename	filename of the TGA file to load ie. "ship.tga".
sprite	Pointer to an array of glImage.
width	Width of of the texture.
height	height of of the texture.
filtermode	GL_NEAREST or GL_LINEAR.

Definition at line 2049 of file gl2d.c.

GLuint glLoadSpriteSet	(	const char *	filename,
		glImage *	sprite,
		const int	width,
		const int	height,
		const int	numframes,
		const unsigned int *	texcoords,
		const GLuint	filtermode
	)

Initializes our spriteset with Texture Packer generated UV coordinates
Very safe and easy to use..

Parameters:

filename	filename of the TGA file to load ie. "ships.tga".
sprite	Pointer to an array of glImage.
width	The horizontal size of the texture
height	The vertical size of the texture
numframes	number of frames in a spriteset (auto-generated by Texture Packer).
texcoords	Texture Packer auto-generated array of UV coords.
filtermode	GL_NEAREST or GL_LINEAR.

Definition at line 1941 of file gl2d.c.

GLuint glLoadTileSet	(	const char *	filename,
		glImage *	sprite,
		const int	tile_wid,
		const int	tile_hei,
		const int	bmp_wid,
		const int	bmp_hei,
		const GLuint	filtermode
	)

Initializes our Tileset (like glInitSpriteset()) but without the use of Texture Packer auto-generated files.
Can only be used when tiles in a tilset are of the same dimensions.

Parameters:

filename	filename of the TGA file to load ie. "ships.tga".
sprite	Pointer to an array of glImage.
tile_wid	Width of each tile in the texture.
tile_hei	Height of each tile in the texture.
bmp_wid	Width of of the texture or tileset.
bmp_hei	height of of the texture or tileset.
filtermode	GL_NEAREST or GL_LINEAR.

Definition at line 2000 of file gl2d.c.

void glPrint	(	int	x,
		int	y,
		const char *	text,
		const GLuint	color
	)

Prints a rudimentary text for feedback/debugging purposes Not to be used in actual application/games as it is extremely sloooow. Rasterfont from the GLRedbook.

Parameters:

x,y	Location of the sprite.
text	text to print.
color	GL2D_RGBA color of the Top-Right corner.

Definition at line 1911 of file gl2d.c.

void glPutPixel	(	int	x,
		int	y,
		const GLuint	color
	)

Draws a Pixel.

Parameters:

x	X position of the pixel.
y	Y position of the pixel.
color	GL2D_RGBA color.

Definition at line 786 of file gl2d.c.

void glScreen2D	(	const int	width,
		const int	height,
		const int	mode
	)

Initializes GL in 2D mode.

Parameters:

width	width of the window.
height	height of the window.
mode	either GLFW_FULLSCREEN or GLFW_WINDOWED

Definition at line 503 of file gl2d.c.

void glScreen2DEx	(	const int	width,
		const int	height,
		const int	mode,
		const int	depthbits,
		const int	stencilbits
	)

Initializes GL in 2D mode with more control.

Parameters:

width	width of the window.
height	height of the window.
mode	either GLFW_FULLSCREEN or GLFW_WINDOWED
depthbits	depth buffer usually 32.
stencilbits	stencil buffer 8 would suffice for most purposes.

Definition at line 510 of file gl2d.c.

void glSprite	(	const int	x,
		const int	y,
		const int	flipmode,
		const glImage *	spr
	)

Draws a Sprite.

Parameters:

x	X position of the sprite.
y	Y position of the sprite.
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1130 of file gl2d.c.

void glSpriteOnQuad	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3,
		int	x4,
		int	y4,
		float	uoff,
		float	voff,
		int	flipmode,
		const glImage *	spr
	)

Draws a Stretched Sprite across a quad
Useful for "Shrearing Effects".

Parameters:

x1,y1	First corner of the sprite.
x2,y2	Second corner of the sprite.
x3,y3	Third corner of the sprite.
x4,y4	Fourth corner of the sprite.
uoff,voff	texture offsets.
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1448 of file gl2d.c.

void glSpriteOnQuadClipped	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3,
		int	x4,
		int	y4,
		float	luclip,
		float	lvclip,
		float	ruclip,
		float	rvclip,
		int	flipmode,
		const glImage *	spr
	)

Draws a Stretched Sprite across a quad with clipped textures I needed this for my ikaruga laser implementation.

Parameters:

x1,y1	First corner of the sprite.
x2,y2	Second corner of the sprite.
x3,y3	Third corner of the sprite.
x4,y4	Fourth corner of the sprite.
luclip,lvclip	left horizo/vertical ntaltexture offsets.
ruclip,rvclip	right horizo/vertical ntaltexture offsets.
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1497 of file gl2d.c.

void glSpriteRotate	(	const int	x,
		const int	y,
		const int	angle,
		const int	flipmode,
		const glImage *	spr
	)

Draws a Center Rotated Sprite.

Parameters:

x	X position of the sprite center.
y	Y position of the sprite center.
angle	Angle(in degrees) to rotate the sprite.
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1269 of file gl2d.c.

void glSpriteRotateScale	(	const int	x,
		const int	y,
		const int	angle,
		const float	scale,
		const int	flipmode,
		const glImage *	spr
	)

Draws a Center Rotated Scaled Sprite.

Parameters:

x	X position of the sprite center.
y	Y position of the sprite center.
angle	Angle(in degrees) to rotate the sprite.
scale	scale value (1.0f is normal).
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1329 of file gl2d.c.

void glSpriteRotateScaleXY	(	const int	x,
		const int	y,
		const int	angle,
		const float	scaleX,
		const float	scaleY,
		const int	flipmode,
		const glImage *	spr
	)

Draws a Center Rotated Axis-Exclusive Scaled Sprite.

Parameters:

x	X position of the sprite center.
y	Y position of the sprite center.
angle	Angle(in degrees) to rotate the sprite.
scaleX	X-Axis scale value (1.0f is normal).
scaleY	Y-Axis scale value (1.0f is normal).
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1387 of file gl2d.c.

void glSpriteScale	(	const int	x,
		const int	y,
		const float	scale,
		const int	flipmode,
		const glImage *	spr
	)

Draws a Scaled Sprite.

Parameters:

x	X position of the sprite.
y	Y position of the sprite.
scale	scale value (1.0f is normal).
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1172 of file gl2d.c.

void glSpriteScaleXY	(	const int	x,
		const int	y,
		const float	scaleX,
		const float	scaleY,
		const int	flipmode,
		const glImage *	spr
	)

Draws an Axis Exclusive Scaled Sprite.

Parameters:

x	X position of the sprite.
y	Y position of the sprite.
scaleX	X-Axis scale value (1.0f is normal).
scaleY	Y-Axis scale value (1.0f is normal).
flipmode	mode for flipping (see GL2D_FLIP_MODE enum).
spr	pointer to a glImage.

Definition at line 1221 of file gl2d.c.

void glSpriteStretchHorizontal	(	int	x,
		int	y,
		int	length,
		const glImage *	spr
	)

Draws a clean horizontally stretched Sprite Useful for lasers and huds.

Parameters:

x,y	Location of the sprite.
length	length to stretch in pixels.
spr	pointer to a glImage.

Definition at line 1543 of file gl2d.c.

void glSpriteStretchHV	(	int	x,
		int	y,
		int	length,
		int	height,
		const glImage *	spr
	)

Draws a clean horizontally and vertically stretched Sprite Useful for lasers, huds and dialog boxes.

Parameters:

x,y	Location of the sprite.
length	length to stretch in pixels.
height	height to stretch in pixels.
spr	pointer to a glImage.

Definition at line 1731 of file gl2d.c.

void glSpriteStretchVertical	(	int	x,
		int	y,
		int	height,
		const glImage *	spr
	)

Draws a clean vertically stretched Sprite Useful for lasers and huds.

Parameters:

x,y	Location of the sprite.
height	height to stretch in pixels.
spr	pointer to a glImage.

Definition at line 1636 of file gl2d.c.

void glTriangle	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3,
		const GLuint	color
	)

Draws a Triangle.

Parameters:

x1,y1	Vertex 1 of the triangle.
x2,y2	Vertex 2 of the triangle.
x3,y3	Vertex 3 of the triangle.
color	GL2D_RGBA color of the triangle.

Definition at line 927 of file gl2d.c.

void glTriangleFilled	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3,
		const GLuint	color
	)

Draws a Triangle filled with a single color.

Parameters:

x1,y1	Vertex 1 of the triangle.
x2,y2	Vertex 2 of the triangle.
x3,y3	Vertex 3 of the triangle.
color	GL2D_RGBA color of the triangle.

Definition at line 949 of file gl2d.c.

void glTriangleFilledGradient	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3,
		const GLuint	color1,
		const GLuint	color2,
		const GLuint	color3
	)

Draws a Triangle filled with a gradient color.

Parameters:

x1,y1	Vertex 1 of the triangle.
x2,y2	Vertex 2 of the triangle.
x3,y3	Vertex 3 of the triangle.
color1	GL2D_RGBA color of the vertex 1.
color2	GL2D_RGBA color of the vertex 2.
color3	GL2D_RGBA color of the vertex 3.

Definition at line 971 of file gl2d.c.

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