polyadvent

A game engine from scratch in C
git clone git://jb55.com/polyadvent
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lens.h (1329B)

      1 #pragma once
      2 
      3 #include "resource.h"
      4 #include <stddef.h>
      5 #include <assert.h>
      6 #include <string.h>
      7 
      8 enum datatype {
      9 	DATA_ID_FLOAT = 1,
     10 	DATA_ID_INT,
     11 	DATA_ID_VEC2,
     12 	DATA_ID_VEC3,
     13 	DATA_ID_VEC3P,
     14 	DATA_ID_MAT3,
     15 	DATA_ID_MAT4,
     16 	DATA_ID_MAT4P,
     17 };
     18 
     19 struct lens {
     20 	const char *name;
     21 	int offset;
     22 	enum datatype type;
     23 };
     24 
     25 static inline void *get_lens_offset_ptr(struct lens *lens, void *structure)
     26 {
     27 	return (void*)((unsigned char*)structure + lens->offset);
     28 }
     29 
     30 static inline float *get_lens_ptr(struct lens *lens, void *structure)
     31 {
     32 	assert(lens->type == DATA_ID_MAT4P || lens->type == DATA_ID_VEC3P);
     33 	float **p = (float**)get_lens_offset_ptr(lens, structure);
     34 	return *p;
     35 }
     36 
     37 static inline float *get_lens_float_array(struct lens *lens, void *structure)
     38 {
     39 	assert(lens->type == DATA_ID_MAT4 ||
     40 	       lens->type == DATA_ID_VEC3 ||
     41 	       lens->type == DATA_ID_VEC2 ||
     42 	       lens->type == DATA_ID_MAT3);
     43 	void *p = get_lens_offset_ptr(lens, structure);
     44 	return (float*)p;
     45 }
     46 
     47 static inline float get_lens_float(struct lens *lens, void *structure)
     48 {
     49 	assert(lens->type == DATA_ID_FLOAT);
     50 	void *p = get_lens_offset_ptr(lens, structure);
     51 	return *(float*)p;
     52 }
     53 
     54 static inline int get_lens_int(struct lens *lens, void *structure)
     55 {
     56 	assert(lens->type == DATA_ID_INT);
     57 	void *p = get_lens_offset_ptr(lens, structure);
     58 	return *(int*)p;
     59 }