lg_opengl_2d.c File Reference

Functions
int	lg_init_renderer_2d ()
void	lg_free_renderer_2d ()
int	lg_render_line_2d (int x1, int y1, int x2, int y2, LG_Color_u color)
int	lg_render_rect_2d (Rec2Di r, LG_Color_u color)
int	lg_render_tex_2d (const LG_Texture *tex, const Rec2Di *src, const Rec2Di *dest)

Detailed Description

LG_Renderer2D structs and funcs for OpenGL 2D rendering

Originally a replacement for SDL 2D accelerated rendering.

Specifically deal with rendering of 2D lines, 2D rectangles, and 2D textures.

Use specific matrices/shaders.

Function Documentation

lg_init_renderer_2d()

int lg_init_renderer_2d

(

)

Initialize the 2D renderer

Call lg_init_line_renderer_2d(), lg_init_rect_renderer_2d() and lg_init_tex_renderer_2d()

Returns

LG_OK if OK

lg_free_renderer_2d()

void lg_free_renderer_2d

(

)

Call lg_free_line_renderer_2d(), lg_free_rect_renderer_2d(), and lg_free_tex_renderer_2d()

lg_render_line_2d()

int lg_render_line_2d	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		LG_Color_u	color
	)

Expect SDL coords sys for input (logical coords, ie inside [0 -> env->top_win_logical_w] x [0 -> env->top_win_logical_h])

Parameters

x1
y1
x2
y2
color	A LG_Color_u

Returns

LG_OK if OK

lg_render_rect_2d()

int lg_render_rect_2d	(	Rec2Di	r,
		LG_Color_u	color
	)

Render a filled rect

Expect SDL coords sys for input (logical coords, ie inside [0 -> env->top_win_logical_w] x [0 -> env->top_win_logical_h])

Parameters

r	A Rec2Di
color	A LG_Color_u

Returns

LG_OK if OK

lg_render_tex_2d()

int lg_render_tex_2d	(	const LG_Texture *	tex,
		const Rec2Di *	src,
		const Rec2Di *	dest
	)

Replace: int SDL_RenderCopy(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_Rect *dstrect)

Expect SDL coords sys for input (logical coords, ie inside [0 -> env->top_win_logical_w] x [0 -> env->top_win_logical_h])

• If NULL, src is the entire texture
• If NULL, dest is the entire rendering target (the texture will be stretched to fill the given rectangle)

Parameters

tex	A LG_Texture
src	A Rec2Di
dest	A Rec2Di

Returns

LG_OK if OK