opengl_render.c File Reference

This file handles the opengl rendering routines. More...

#include "opengl_render.h"
#include "camera.h"
#include "gui.h"
#include "opengl.h"

Include dependency graph for opengl_render.c:

Go to the source code of this file.

Macros
#define	OPENGL_RENDER_VBO_SIZE   256

Functions
void	gl_beginSolidProgram (mat4 projection, const glColour *c)
void	gl_endSolidProgram (void)
void	gl_beginSmoothProgram (mat4 projection)
void	gl_endSmoothProgram ()
void	gl_renderRect (double x, double y, double w, double h, const glColour *c)
	Renders a rectangle.
void	gl_renderRectEmpty (double x, double y, double w, double h, const glColour *c)
	Renders a rectangle.
void	gl_renderRectH (const mat4 *H, const glColour *c, int filled)
	Renders a rectangle.
void	gl_renderCross (double x, double y, double r, const glColour *c)
	Renders a cross at a given position.
void	gl_renderTriangleEmpty (double x, double y, double a, double s, double length, const glColour *c)
	Renders a triangle at a given position.
void	gl_renderDepthRawH (GLuint depth, const mat4 *projection, const mat4 *tex_mat)
void	gl_renderDepthRaw (GLuint depth, uint8_t flags, double x, double y, double w, double h, double tx, double ty, double tw, double th, double angle)
void	gl_renderTextureDepthRawH (GLuint texture, GLuint depth, const mat4 *projection, const mat4 *tex_mat, const glColour *c)
void	gl_renderTextureDepthRaw (GLuint texture, GLuint depth, uint8_t flags, double x, double y, double w, double h, double tx, double ty, double tw, double th, const glColour *c, double angle)
void	gl_renderTextureRawH (GLuint texture, const mat4 *projection, const mat4 *tex_mat, const glColour *c)
	Texture blitting backend.
void	gl_renderTextureRaw (GLuint texture, uint8_t flags, double x, double y, double w, double h, double tx, double ty, double tw, double th, const glColour *c, double angle)
	Texture blitting backend.
void	gl_renderTexture (const glTexture *texture, double x, double y, double w, double h, double tx, double ty, double tw, double th, const glColour *c, double angle)
	Texture blitting backend.
void	gl_renderSDF (const glTexture *texture, double x, double y, double w, double h, const glColour *c, double angle, double outline)
	SDF Texture blitting backend.
void	gl_renderTextureInterpolateRawH (GLuint ta, GLuint tb, double inter, const mat4 *projection, const mat4 *tex_mat, const glColour *c)
	Texture blitting backend for interpolated texture.
void	gl_renderTextureInterpolate (const glTexture *ta, const glTexture *tb, double inter, double x, double y, double w, double h, double tx, double ty, double tw, double th, const glColour *c)
	Texture blitting backend for interpolated texture.
void	gl_gameToScreenCoords (double *nx, double *ny, double bx, double by)
	Converts in-game coordinates to screen coordinates.
mat4	gl_gameToScreenMatrix (mat4 lhs)
	Return a transformation which converts in-game coordinates to screen coordinates.
void	gl_screenToGameCoords (double *nx, double *ny, int bx, int by)
	Converts screen coordinates to in-game coordinates.
void	gl_renderSprite (const glTexture *sprite, double bx, double by, int sx, int sy, const glColour *c)
	Blits a sprite, position is relative to the player.
void	gl_renderSpriteScale (const glTexture *sprite, double bx, double by, double scalew, double scaleh, int sx, int sy, const glColour *c)
	Blits a sprite, position is relative to the player.
void	gl_renderSpriteRotate (const glTexture *sprite, double bx, double by, double angle, int sx, int sy, const glColour *c)
	Blits a sprite, position is relative to the player with rotation.
void	gl_renderSpriteScaleRotate (const glTexture *sprite, double bx, double by, double scalew, double scaleh, double angle, int sx, int sy, const glColour *c)
	Blits a sprite, position is relative to the player with scaling and rotation.
void	gl_renderSpriteInterpolate (const glTexture *sa, const glTexture *sb, double inter, double bx, double by, int sx, int sy, const glColour *c)
	Blits a sprite interpolating, position is relative to the player.
void	gl_renderSpriteInterpolateScale (const glTexture *sa, const glTexture *sb, double inter, double bx, double by, double scalew, double scaleh, int sx, int sy, const glColour *c)
	Blits a sprite interpolating, position is relative to the player.
void	gl_renderStaticSprite (const glTexture *sprite, double bx, double by, int sx, int sy, const glColour *c)
	Blits a sprite, position is in absolute screen coordinates.
void	gl_renderStaticSpriteInterpolate (const glTexture *sa, const glTexture *sb, double inter, double bx, double by, int sx, int sy, const glColour *c)
	Blits a sprite interpolating, position is relative to the player.
void	gl_renderStaticSpriteInterpolateScale (const glTexture *sa, const glTexture *sb, double inter, double bx, double by, double scalew, double scaleh, int sx, int sy, const glColour *c)
	Blits a sprite interpolating, position is relative to the player.
void	gl_renderScaleSprite (const glTexture *sprite, double bx, double by, int sx, int sy, double bw, double bh, const glColour *c)
	Blits a scaled sprite, position is in absolute screen coordinates.
void	gl_renderScale (const glTexture *texture, double bx, double by, double bw, double bh, const glColour *c)
	Blits a texture scaling it.
void	gl_renderScaleAspect (const glTexture *texture, double bx, double by, double bw, double bh, const glColour *c)
	Blits a texture scaling it to fit a rectangle, but conserves aspect ratio.
void	gl_renderStatic (const glTexture *texture, double bx, double by, const glColour *c)
	Blits a texture to a position.
void	gl_renderShader (double x, double y, double w, double h, double r, const SimpleShader *shd, const glColour *c, int center)
	Renders a simple shader.
void	gl_renderShaderH (const SimpleShader *shd, const mat4 *H, const glColour *c, int center)
	Renders a simple shader with a transformation.
void	gl_renderCircle (double cx, double cy, double r, const glColour *c, int filled)
	Draws a circle.
void	gl_renderCircleH (const mat4 *H, const glColour *c, int filled)
	Draws a circle.
void	gl_renderLine (double x1, double y1, double x2, double y2, const glColour *c)
	Draws a line.
void	gl_clipRect (int x, int y, int w, int h)
	Sets up 2d clipping planes around a rectangle.
void	gl_unclipRect (void)
	Clears the 2d clipping planes.
int	gl_initRender (void)
	Initializes the OpenGL rendering routines.
void	gl_exitRender (void)
	Cleans up the OpenGL rendering routines.

Variables
static gl_vbo *	gl_renderVBO = 0
gl_vbo *	gl_squareVBO = 0
static gl_vbo *	gl_squareEmptyVBO = 0
gl_vbo *	gl_circleVBO = 0
static gl_vbo *	gl_lineVBO = 0
static gl_vbo *	gl_triangleVBO = 0
static int	gl_renderVBOtexOffset = 0
static int	gl_renderVBOcolOffset = 0

Detailed Description

This file handles the opengl rendering routines.

There are two coordinate systems: relative and absolute.

Relative:

• Everything is drawn relative to the player, if it doesn't fit on screen it is clipped.
• Origin (0., 0.) would be ontop of the player.

Absolute:

• Everything is drawn in "screen coordinates".
• (0., 0.) is bottom left.
• (SCREEN_W, SCREEN_H) is top right.

Note that the game actually uses a third type of coordinates for when using raw commands. In this third type, the (0.,0.) is actually in middle of the screen. (-SCREEN_W/2.,-SCREEN_H/2.) is bottom left and (+SCREEN_W/2.,+SCREEN_H/2.) is top right.

Definition in file opengl_render.c.

Macro Definition Documentation

OPENGL_RENDER_VBO_SIZE

#define OPENGL_RENDER_VBO_SIZE   256

Size of VBO.

Definition at line 36 of file opengl_render.c.

Function Documentation

gl_beginSmoothProgram()

void gl_beginSmoothProgram

(

mat4

projection

)

Definition at line 62 of file opengl_render.c.

gl_beginSolidProgram()

void gl_beginSolidProgram	(	mat4	projection,
		const glColour *	c )

Definition at line 47 of file opengl_render.c.

gl_clipRect()

void gl_clipRect	(	int	x,
		int	y,
		int	w,
		int	h )

Sets up 2d clipping planes around a rectangle.

Parameters

x	X position of the rectangle.
y	Y position of the rectangle.
w	Width of the rectangle.
h	Height of the rectangle.

Definition at line 1233 of file opengl_render.c.

gl_endSmoothProgram()

void gl_endSmoothProgram

(

void

)

Definition at line 70 of file opengl_render.c.

gl_endSolidProgram()

void gl_endSolidProgram

(

void

)

Definition at line 55 of file opengl_render.c.

gl_exitRender()

void gl_exitRender

(

void

)

Cleans up the OpenGL rendering routines.

Definition at line 1325 of file opengl_render.c.

gl_gameToScreenCoords()

void gl_gameToScreenCoords	(	double *	nx,
		double *	ny,
		double	bx,
		double	by )

Converts in-game coordinates to screen coordinates.

Parameters

[out]	nx	New screen X coord.
[out]	ny	New screen Y coord.
	bx	Game X coord to translate.
	by	Game Y coord to translate.

Definition at line 608 of file opengl_render.c.

gl_gameToScreenMatrix()

mat4 gl_gameToScreenMatrix

(

mat4

lhs

)

Return a transformation which converts in-game coordinates to screen coordinates.

Parameters

lhs	Matrix to multiply by the conversion matrix.

Definition at line 628 of file opengl_render.c.

gl_initRender()

int gl_initRender

(

void

)

Initializes the OpenGL rendering routines.

Returns

0 on success.

Definition at line 1258 of file opengl_render.c.

gl_renderCircle()

void gl_renderCircle	(	double	cx,
		double	cy,
		double	r,
		const glColour *	c,
		int	filled )

Draws a circle.

Parameters

cx	X position of the center in screen coordinates.
cy	Y position of the center in screen coordinates.
r	Radius of the circle.
c	Colour to use.
filled	Whether or not it should be filled.

Definition at line 1175 of file opengl_render.c.

gl_renderCircleH()

void gl_renderCircleH	(	const mat4 *	H,
		const glColour *	c,
		int	filled )

Draws a circle.

Parameters

H	Transformation matrix to draw the circle.
c	Colour to use.
filled	Whether or not it should be filled.

Definition at line 1193 of file opengl_render.c.

gl_renderCross()

void gl_renderCross	(	double	x,
		double	y,
		double	r,
		const glColour *	c )

Renders a cross at a given position.

Parameters

x	X position to center at.
y	Y position to center at.
r	Radius of cross.
c	Colour to use.

Definition at line 144 of file opengl_render.c.

gl_renderDepthRaw()

void gl_renderDepthRaw	(	GLuint	depth,
		uint8_t	flags,
		double	x,
		double	y,
		double	w,
		double	h,
		double	tx,
		double	ty,
		double	tw,
		double	th,
		double	angle )

Definition at line 216 of file opengl_render.c.

gl_renderDepthRawH()

void gl_renderDepthRawH	(	GLuint	depth,
		const mat4 *	projection,
		const mat4 *	tex_mat )

Definition at line 178 of file opengl_render.c.

gl_renderLine()

void gl_renderLine	(	double	x1,
		double	y1,
		double	x2,
		double	y2,
		const glColour *	c )

Draws a line.

Parameters

x1	X position of the first point in screen coordinates.
y1	Y position of the first point in screen coordinates.
x2	X position of the second point in screen coordinates.
y2	Y position of the second point in screen coordinates.
c	Colour to use.

Definition at line 1213 of file opengl_render.c.

gl_renderRect()

void gl_renderRect	(	double	x,
		double	y,
		double	w,
		double	h,
		const glColour *	c )

Renders a rectangle.

Parameters

x	X position to render rectangle at.
y	Y position to render rectangle at.
w	Rectangle width.
h	Rectangle height.
c	Rectangle colour.

Definition at line 87 of file opengl_render.c.

gl_renderRectEmpty()

void gl_renderRectEmpty	(	double	x,
		double	y,
		double	w,
		double	h,
		const glColour *	c )

Renders a rectangle.

Parameters

x	X position to render rectangle at.
y	Y position to render rectangle at.
w	Rectangle width.
h	Rectangle height.
c	Rectangle colour.

Definition at line 105 of file opengl_render.c.

gl_renderRectH()

void gl_renderRectH	(	const mat4 *	H,
		const glColour *	c,
		int	filled )

Renders a rectangle.

Parameters

H	Transformation matrix to apply.
filled	Whether or not to fill.
c	Rectangle colour.

Definition at line 121 of file opengl_render.c.

gl_renderScale()

void gl_renderScale	(	const glTexture *	texture,
		double	bx,
		double	by,
		double	bw,
		double	bh,
		const glColour *	c )

Blits a texture scaling it.

Parameters

texture	Texture to blit.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
bw	Width to scale to.
bh	Height to scale to.
c	Colour to use (modifies texture colour).

Definition at line 1046 of file opengl_render.c.

gl_renderScaleAspect()

void gl_renderScaleAspect	(	const glTexture *	texture,
		double	bx,
		double	by,
		double	bw,
		double	bh,
		const glColour *	c )

Blits a texture scaling it to fit a rectangle, but conserves aspect ratio.

Parameters

texture	Texture to blit.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
bw	Width to scale to.
bh	Height to scale to.
c	Colour to use (modifies texture colour).

Definition at line 1074 of file opengl_render.c.

gl_renderScaleSprite()

void gl_renderScaleSprite	(	const glTexture *	sprite,
		double	bx,
		double	by,
		int	sx,
		int	sy,
		double	bw,
		double	bh,
		const glColour *	c )

Blits a scaled sprite, position is in absolute screen coordinates.

Parameters

sprite	Sprite to blit.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
bw	Width of sprite to render at.
bh	Height of sprite to render at.
c	Colour to use (modifies texture colour).

Definition at line 1018 of file opengl_render.c.

gl_renderSDF()

void gl_renderSDF	(	const glTexture *	texture,
		double	x,
		double	y,
		double	w,
		double	h,
		const glColour *	c,
		double	angle,
		double	outline )

SDF Texture blitting backend.

Parameters

texture	Texture to blit.
x	X position of the texture on the screen. (units pixels)
y	Y position of the texture on the screen. (units pixels)
w	Width on the screen. (units pixels)
h	Height on the screen. (units pixels)
c	Colour to use (modifies texture colour).
angle	Rotation to apply (radians ccw around the center).
outline	Thickness of the outline.

Definition at line 437 of file opengl_render.c.

gl_renderShader()

void gl_renderShader	(	double	x,
		double	y,
		double	w,
		double	h,
		double	r,
		const SimpleShader *	shd,
		const glColour *	c,
		int	center )

Renders a simple shader.

Parameters

x	X position.
y	Y position.
w	Width.
h	Height.
r	Rotation or 0. to disable.
shd	Shader to render.
c	Colour to use or NULL if not necessary.
center	Whether or not to center the shader on the position and use [-1,1] coordinates or set bottom-left and use [0,1] coordinates.

Definition at line 1126 of file opengl_render.c.

gl_renderShaderH()

void gl_renderShaderH	(	const SimpleShader *	shd,
		const mat4 *	H,
		const glColour *	c,
		int	center )

Renders a simple shader with a transformation.

Parameters

shd	Shader to render.
H	Transformation matrix.
c	Colour to use or NULL if not necessary.
center	Whether or not to center the shader on the position and use [-1,1] coordinates or set bottom-left and use [0,1] coordinates.

Definition at line 1147 of file opengl_render.c.

gl_renderSprite()

void gl_renderSprite	(	const glTexture *	sprite,
		double	bx,
		double	by,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Parameters

sprite	Sprite to blit.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 679 of file opengl_render.c.

gl_renderSpriteInterpolate()

void gl_renderSpriteInterpolate	(	const glTexture *	sa,
		const glTexture *	sb,
		double	inter,
		double	bx,
		double	by,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite interpolating, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Interpolation is: sa*inter + sb*1.-inter)

Parameters

sa	Sprite A to blit.
sb	Sprite B to blit.
inter	Amount to interpolate.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 852 of file opengl_render.c.

gl_renderSpriteInterpolateScale()

void gl_renderSpriteInterpolateScale	(	const glTexture *	sa,
		const glTexture *	sb,
		double	inter,
		double	bx,
		double	by,
		double	scalew,
		double	scaleh,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite interpolating, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Interpolation is: sa*inter + sb*1.-inter)

Parameters

sa	Sprite A to blit.
sb	Sprite B to blit.
inter	Amount to interpolate.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
scalew	X scale factor.
scaleh	Y scale factor.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 878 of file opengl_render.c.

gl_renderSpriteRotate()

void gl_renderSpriteRotate	(	const glTexture *	sprite,
		double	bx,
		double	by,
		double	angle,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite, position is relative to the player with rotation.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Parameters

sprite	Sprite to blit.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
angle	Angle to rotate when rendering.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 763 of file opengl_render.c.

gl_renderSpriteScale()

void gl_renderSpriteScale	(	const glTexture *	sprite,
		double	bx,
		double	by,
		double	scalew,
		double	scaleh,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Parameters

sprite	Sprite to blit.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
scalew	Scaling of width.
scaleh	Scaling of height.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 721 of file opengl_render.c.

gl_renderSpriteScaleRotate()

void gl_renderSpriteScaleRotate	(	const glTexture *	sprite,
		double	bx,
		double	by,
		double	scalew,
		double	scaleh,
		double	angle,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite, position is relative to the player with scaling and rotation.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Parameters

sprite	Sprite to blit.
bx	X position of the texture relative to the player.
by	Y position of the texture relative to the player.
scalew	Scaling of width.
scaleh	Scaling of height.
angle	Angle to rotate when rendering.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 807 of file opengl_render.c.

gl_renderStatic()

void gl_renderStatic	(	const glTexture *	texture,
		double	bx,
		double	by,
		const glColour *	c )

Blits a texture to a position.

Parameters

texture	Texture to blit.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
c	Colour to use (modifies texture colour).

Definition at line 1099 of file opengl_render.c.

gl_renderStaticSprite()

void gl_renderStaticSprite	(	const glTexture *	sprite,
		double	bx,
		double	by,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite, position is in absolute screen coordinates.

Parameters

sprite	Sprite to blit.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 917 of file opengl_render.c.

gl_renderStaticSpriteInterpolate()

void gl_renderStaticSpriteInterpolate	(	const glTexture *	sa,
		const glTexture *	sb,
		double	inter,
		double	bx,
		double	by,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite interpolating, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Interpolation is: sa*inter + sb*1.-inter)

Parameters

sa	Sprite A to blit.
sb	Sprite B to blit.
inter	Amount to interpolate.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 951 of file opengl_render.c.

gl_renderStaticSpriteInterpolateScale()

void gl_renderStaticSpriteInterpolateScale	(	const glTexture *	sa,
		const glTexture *	sb,
		double	inter,
		double	bx,
		double	by,
		double	scalew,
		double	scaleh,
		int	sx,
		int	sy,
		const glColour *	c )

Blits a sprite interpolating, position is relative to the player.

Since position is in "game coordinates" it is subject to all sorts of position transformations.

Interpolation is: sa*inter + sb*1.-inter)

Parameters

sa	Sprite A to blit.
sb	Sprite B to blit.
inter	Amount to interpolate.
bx	X position of the texture in screen coordinates.
by	Y position of the texture in screen coordinates.
scalew	X scale factor.
scaleh	Y scale factor.
sx	X position of the sprite to use.
sy	Y position of the sprite to use.
c	Colour to use (modifies texture colour).

Definition at line 978 of file opengl_render.c.

gl_renderTexture()

void gl_renderTexture	(	const glTexture *	texture,
		double	x,
		double	y,
		double	w,
		double	h,
		double	tx,
		double	ty,
		double	tw,
		double	th,
		const glColour *	c,
		double	angle )

Texture blitting backend.

Parameters

texture	Texture to blit.
x	X position of the texture on the screen. (units pixels)
y	Y position of the texture on the screen. (units pixels)
w	Width on the screen. (units pixels)
h	Height on the screen. (units pixels)
tx	X position within the texture. [0:1]
ty	Y position within the texture. [0:1]
tw	Texture width. [0:1]
th	Texture height. [0:1]
c	Colour to use (modifies texture colour).
angle	Rotation to apply (radians ccw around the center).

Definition at line 417 of file opengl_render.c.

gl_renderTextureDepthRaw()

void gl_renderTextureDepthRaw	(	GLuint	texture,
		GLuint	depth,
		uint8_t	flags,
		double	x,
		double	y,
		double	w,
		double	h,
		double	tx,
		double	ty,
		double	tw,
		double	th,
		const glColour *	c,
		double	angle )

Definition at line 288 of file opengl_render.c.

gl_renderTextureDepthRawH()

void gl_renderTextureDepthRawH	(	GLuint	texture,
		GLuint	depth,
		const mat4 *	projection,
		const mat4 *	tex_mat,
		const glColour *	c )

Definition at line 243 of file opengl_render.c.

gl_renderTextureInterpolate()

void gl_renderTextureInterpolate	(	const glTexture *	ta,
		const glTexture *	tb,
		double	inter,
		double	x,
		double	y,
		double	w,
		double	h,
		double	tx,
		double	ty,
		double	tw,
		double	th,
		const glColour *	c )

Texture blitting backend for interpolated texture.

Value blitted is ta*inter + tb*(1.-inter).

Parameters

ta	Texture A to blit.
tb	Texture B to blit.
inter	Amount of interpolation to do.
x	X position of the texture on the screen.
y	Y position of the texture on the screen.
w	Width on the screen. (units pixels)
h	Height on the screen. (units pixels)
tx	X position within the texture.
ty	Y position within the texture.
tw	Texture width.
th	Texture height.
c	Colour to use (modifies texture colour).

Definition at line 576 of file opengl_render.c.

gl_renderTextureInterpolateRawH()

void gl_renderTextureInterpolateRawH	(	GLuint	ta,
		GLuint	tb,
		double	inter,
		const mat4 *	projection,
		const mat4 *	tex_mat,
		const glColour *	c )

Texture blitting backend for interpolated texture.

Parameters

ta	Texture id A to blit.
tb	Texture id B to blit.
inter	Amount of interpolation to do.
projection	Projection matrix tu use.
tex_mat	Texture matrix to use.
c	Colour to use (modifies texture colour).

Definition at line 510 of file opengl_render.c.

gl_renderTextureRaw()

void gl_renderTextureRaw	(	GLuint	texture,
		uint8_t	flags,
		double	x,
		double	y,
		double	w,
		double	h,
		double	tx,
		double	ty,
		double	tw,
		double	th,
		const glColour *	c,
		double	angle )

Texture blitting backend.

Parameters

texture	Texture to blit.
flags	Texture flags,.
x	X position of the texture on the screen. (units pixels)
y	Y position of the texture on the screen. (units pixels)
w	Width on the screen. (units pixels)
h	Height on the screen. (units pixels)
tx	X position within the texture. [0:1]
ty	Y position within the texture. [0:1]
tw	Texture width. [0:1]
th	Texture height. [0:1]
c	Colour to use (modifies texture colour).
angle	Rotation to apply (radians ccw around the center).

Definition at line 374 of file opengl_render.c.

gl_renderTextureRawH()

void gl_renderTextureRawH	(	GLuint	texture,
		const mat4 *	projection,
		const mat4 *	tex_mat,
		const glColour *	c )

Texture blitting backend.

Parameters

texture	Texture to blit.
projection	Projection matrix tu use.
tex_mat	Texture matrix to use.
c	Colour to use (modifies texture colour).

Definition at line 324 of file opengl_render.c.

gl_renderTriangleEmpty()

void gl_renderTriangleEmpty	(	double	x,
		double	y,
		double	a,
		double	s,
		double	length,
		const glColour *	c )

Renders a triangle at a given position.

Parameters

x	X position to center at.
y	Y position to center at.
a	Angle the triangle should "face" (right is 0.)
s	Scaling of the triangle.
length	Length deforming factor. Setting it to a value of other than 1. moves away from an equilateral triangle.
c	Colour to use.

Definition at line 162 of file opengl_render.c.

gl_screenToGameCoords()

void gl_screenToGameCoords	(	double *	nx,
		double *	ny,
		int	bx,
		int	by )

Converts screen coordinates to in-game coordinates.

Parameters

[out]	nx	New in-game X coord.
[out]	ny	New in-game Y coord.
	bx	Screen X coord to translate.
	by	Screen Y coord to translate.

Definition at line 652 of file opengl_render.c.

gl_unclipRect()

void gl_unclipRect

(

void

)

Clears the 2d clipping planes.

Definition at line 1247 of file opengl_render.c.

Variable Documentation

gl_circleVBO

gl_vbo* gl_circleVBO = 0

Definition at line 41 of file opengl_render.c.

gl_lineVBO

gl_vbo* gl_lineVBO = 0

static

Definition at line 42 of file opengl_render.c.

gl_renderVBO

gl_vbo* gl_renderVBO = 0

static

VBO for rendering stuff.

Definition at line 38 of file opengl_render.c.

gl_renderVBOcolOffset

int gl_renderVBOcolOffset = 0

static

VBO colour offset.

Definition at line 45 of file opengl_render.c.

gl_renderVBOtexOffset

int gl_renderVBOtexOffset = 0

static

VBO texture offset.

Definition at line 44 of file opengl_render.c.

gl_squareEmptyVBO

gl_vbo* gl_squareEmptyVBO = 0

static

Definition at line 40 of file opengl_render.c.

gl_squareVBO

gl_vbo* gl_squareVBO = 0

Definition at line 39 of file opengl_render.c.

gl_triangleVBO

gl_vbo* gl_triangleVBO = 0

static

Definition at line 43 of file opengl_render.c.