slembcke

#import "DeformableBitmapDemo.h"

@implementation DeformableBitmapDemo

@synthesize space;

#define PIXEL_SIZE 4
#define TILE_SIZE 128

- (id) init

slembcke

1.0 -> 0.0
0.9 -> 1/19
0.8 -> 1/9
0.7 -> 3/17
0.6 -> 1/4
0.5 -> 1/3
0.4 -> 3/7
0.3 -> 7/13
0.2 -> 2/3
0.1 -> 9/11

slembcke

-(void) draw;
{
	glDisableClientState(GL_COLOR_ARRAY);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisable(GL_TEXTURE_2D);
	
	glPushMatrix(); {
		glScalef(CC_CONTENT_SCALE_FACTOR(), CC_CONTENT_SCALE_FACTOR(), 1.0);
		glLineWidth(1.0f);
		cpSpaceEachShape(space.space, drawShape, NULL);

slembcke

#if __has_feature(objc_arc)
	typedef __strong id CCARRAY_ID;
	#define CCARRAY_RETAIN(obj) obj
	#define CCARRAY_RELEASE(obj) (void)obj
#else
	typedef id CCARRAY_ID;
	#define CCARRAY_RETAIN(obj) [obj retain]
	#define CCARRAY_RELEASE(obj) [obj release]
#endif

slembcke

cpVect a, b; // segment endpoints
cpVect p; // point you are testing

cpVect delta = cpvsub(b, a);
cpFloat closest_t = cpvdot(delta, cpvsub(p, a))/cpvlengthsq(delta);
cpVect closest = cpvlerp(a, b, cpfclamp01(closest_t));

slembcke

#extension GL_OES_standard_derivatives : enable

varying lowp vec4 frag_color;
varying lowp vec2 frag_texcoord;

void main()
{
#if GL_OES_standard_derivatives == 1
	gl_FragColor = frag_color*smoothstep(0.0, length(fwidth(frag_texcoord)), 1.0 - length(frag_texcoord));
#else

slembcke

// If 'self' is assigned to obj.delegate and I don't explicitly copy the block
// it crashes with an EXC_BAD_ACCESS in objc_msgSend() calling 'retain' on

NSArray *constructors = [NSArray arrayWithObjects:
	[^(cpVect pos){
		GameObject *obj = ...;
		obj.delegate = self;
		
		return obj;
	} copy],

slembcke

// Some old PNG screenshot code that I used in a Ruby binding.

static VALUE
rbas_screen_shot(VALUE self, VALUE filename)
{
	int bytes = AS_SCREEN_W * AS_SCREEN_H * 3;
	GLubyte pixels[bytes];
	glReadPixels(0, 0, AS_SCREEN_W, AS_SCREEN_H, GL_RGB, GL_UNSIGNED_BYTE, pixels);
	
	char *name = StringValuePtr(filename);

slembcke

#include <stdio.h>

struct Person {
	char *name;
	int age;
};

struct Employee {
	// You can cast a pointer to an Employee struct to
	// a Person struct because you put a person struct in

slembcke

// ** (vanilla) Point Queries:

// For the shape specific function, you give it a point and it returns true/false if the point is inside:
cpBool cpShapePointQuery(cpShape *shape, cpVect p);

// The "easy" space query function takes a point and some filter parmeters and returns the shape at the point or NULL:
cpShape *cpSpacePointQueryFirst(cpSpace *space, cpVect point, cpLayers layers, cpGroup group);

// The callback based iterator version looks like this:
typedef void (*cpSpacePointQueryFunc)(cpShape *shape, void *data);