lg_grid_geom_shader.c File Reference

Functions
zboolean	lg_build_grid_geom_shader (LG_Grid_GeomShader *grid_geomsh, LG_Color_u color)
zboolean	lg_draw_grid_geom (LG_Grid_GeomShader *grid_geomsh, mat4_t *view_proj_m, int grid_half_size, int grid_scaling, zboolean check_gl)
void	lg_free_grid_geom (LG_Grid_GeomShader *grid_geomsh)

Detailed Description

=== Grid geometry shader stuff ===

Function Documentation

lg_build_grid_geom_shader()

zboolean lg_build_grid_geom_shader	(	LG_Grid_GeomShader *	grid_geomsh,
		LG_Color_u	color
	)

Initialize an instance of a LG_Grid_GeomShader

typedef struct {
     mat4_t             local_matrix;
     mat4_t             world_matrix;
     LG_ShaderProg      shader_prog;
     LG_ShaderULocs     shader_u_loc;
     LG_VAO             vao;
} LG_Grid_GeomShader;

Parameters

grid_geomsh	Pointer to an uninitialized LG_Grid_GeomShader instance
color	Grid color

Returns

TRUE if OK, FALSE otherwise

lg_draw_grid_geom()

zboolean lg_draw_grid_geom	(	LG_Grid_GeomShader *	grid_geomsh,
		mat4_t *	view_proj_m,
		int	grid_half_size,
		int	grid_scaling,
		zboolean	check_gl
	)

Draw a grid from a LG_Grid_GeomShader

grid_half_size max value = 31

256 is max valid value for max_vertices num_vertices = (grid_half_size * 2 + 1) * 4 -> grid_half_size * 2 + 1 = max_vertices / 4 grid_half_size = ((max_vertices) / 4 - 1) / 2 max_vertices = 256 -> grid_half_size max value = 31

(see: LibGame/src/libgame/shaders/grid_shader2.geom)

Parameters

grid_geomsh	Pointer to a LG_Grid_GeomShader
view_proj_m	Camera view proj matrix
grid_half_size
grid_scaling
check_gl	Whether to check for GL errors - useful when debugging

Returns

If check_gl is set: TRUE if OK, FALSE otherwise - always TRUE if check_gl is not set

lg_free_grid_geom()

void lg_free_grid_geom

(

LG_Grid_GeomShader *

grid_geomsh

)

Free VAO and shader prog of a LG_Grid_GeomShader

Parameters

grid_geomsh

Pointer to a LG_Grid_GeomShader