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#ifndef SIM_H_
#define SIM_H_
#if _WIN32
#include <box2d.h>
#else
#include <box2d/box2d.h>
#endif
#define STBTT_STATIC
#define STB_TRUETYPE_IMPLEMENTATION
no_warn_start
#include "lib/stb_truetype.h"
no_warn_end
// enums with a specified width are a clang C extension & available in C++11
#if defined __clang__ || __cplusplus >= 201103L
#define ENUM_U8 typedef enum : u8
#define ENUM_U8_END(name) name
#define ENUM_U16 typedef enum : u16
#define ENUM_U16_END(name) name
#else
#define ENUM_U8 enum
#define ENUM_U8_END(name) ; typedef u8 name
#define ENUM_U16 enum
#define ENUM_U16_END(name) ; typedef u16 name
#endif
#ifdef __GNUC__
#define maybe_unused __attribute__((unused))
#else
#define maybe_unused
#endif
typedef void (APIENTRY *GLAttachShader)(GLuint program, GLuint shader);
typedef void (APIENTRY *GLCompileShader)(GLuint shader);
typedef GLuint (APIENTRY *GLCreateProgram)(void);
typedef GLuint (APIENTRY *GLCreateShader)(GLenum shaderType);
typedef void (APIENTRY *GLDeleteProgram)(GLuint program);
typedef void (APIENTRY *GLDeleteShader)(GLuint shader);
typedef GLint (APIENTRY *GLGetAttribLocation)(GLuint program, const char *name);
typedef void (APIENTRY *GLGetProgramInfoLog)(GLuint program, GLsizei maxLength, GLsizei *length, char *infoLog);
typedef void (APIENTRY *GLGetProgramiv)(GLuint program, GLenum pname, GLint *params);
typedef void (APIENTRY *GLGetShaderInfoLog)(GLuint shader, GLsizei maxLength, GLsizei *length, char *infoLog);
typedef void (APIENTRY *GLGetShaderiv)(GLuint shader, GLenum pname, GLint *params);
typedef GLint (APIENTRY *GLGetUniformLocation)(GLuint program, char const *name);
typedef void (APIENTRY *GLLinkProgram)(GLuint program);
typedef void (APIENTRY *GLShaderSource)(GLuint shader, GLsizei count, const char *const *string, const GLint *length);
typedef void (APIENTRY *GLUniform1f)(GLint location, GLfloat v0);
typedef void (APIENTRY *GLUniform2f)(GLint location, GLfloat v0, GLfloat v1);
typedef void (APIENTRY *GLUniform3f)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2);
typedef void (APIENTRY *GLUniform4f)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
typedef void (APIENTRY *GLUniform1i)(GLint location, GLint v0);
typedef void (APIENTRY *GLUniform2i)(GLint location, GLint v0, GLint v1);
typedef void (APIENTRY *GLUniform3i)(GLint location, GLint v0, GLint v1, GLint v2);
typedef void (APIENTRY *GLUniform4i)(GLint location, GLint v0, GLint v1, GLint v2, GLint v3);
typedef void (APIENTRY *GLUniformMatrix4fv)(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
typedef void (APIENTRY *GLUseProgram)(GLuint program);
typedef void (APIENTRY *GLVertexAttrib1f)(GLuint index, GLfloat v0);
typedef void (APIENTRY *GLVertexAttrib2f)(GLuint index, GLfloat v0, GLfloat v1);
typedef void (APIENTRY *GLVertexAttrib3f)(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2);
typedef void (APIENTRY *GLVertexAttrib4f)(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
typedef struct {
GLAttachShader AttachShader;
GLCompileShader CompileShader;
GLCreateProgram CreateProgram;
GLCreateShader CreateShader;
GLDeleteProgram DeleteProgram;
GLDeleteShader DeleteShader;
GLGetAttribLocation GetAttribLocation;
GLGetProgramInfoLog GetProgramInfoLog;
GLGetProgramiv GetProgramiv;
GLGetShaderInfoLog GetShaderInfoLog;
GLGetShaderiv GetShaderiv;
GLGetUniformLocation GetUniformLocation;
GLLinkProgram LinkProgram;
GLShaderSource ShaderSource;
GLUniform1f Uniform1f;
GLUniform2f Uniform2f;
GLUniform3f Uniform3f;
GLUniform4f Uniform4f;
GLUniform1i Uniform1i;
GLUniform2i Uniform2i;
GLUniform3i Uniform3i;
GLUniform4i Uniform4i;
GLUniformMatrix4fv UniformMatrix4fv;
GLUseProgram UseProgram;
GLVertexAttrib1f VertexAttrib1f;
GLVertexAttrib2f VertexAttrib2f;
GLVertexAttrib3f VertexAttrib3f;
GLVertexAttrib4f VertexAttrib4f;
} GL;
typedef struct {
float char_height;
GLuint texture;
int tex_width, tex_height;
stbtt_bakedchar char_data[96];
} Font;
typedef struct {
GLuint program;
#if DEBUG
char vertex_filename[32];
char fragment_filename[32];
struct timespec last_modified;
#endif
} ShaderBase;
typedef GLuint VertexAttributeLocation;
typedef GLint UniformLocation;
// shader for platforms
typedef struct {
ShaderBase base;
VertexAttributeLocation vertex_p1, vertex_p2; // endpoints of platform
UniformLocation uniform_thickness; // this is half the "width" of the platform
UniformLocation uniform_transform; // 4x4 matrix position is multiplied by
} ShaderPlatform;
typedef struct {
ShaderBase base;
UniformLocation uniform_transform, uniform_center, uniform_radius;
} ShaderBall;
typedef struct {
b2Body *body;
v2 center; // NOTE: when creating a moving platform, you don't need to set this (it will be automatically initialized to move_pos1)
float size;
float angle;
bool moves; // does this platform move?
// if it's a moving platform
float move_speed;
v2 move_p1;
v2 move_p2;
float rotate_speed;
u32 color;
} Platform;
typedef struct {
v2 pos; // position
float radius;
b2Body *body;
} Ball;
#define USER_DATA_TYPE_SHIFT 12
#define USER_DATA_TYPE (((uintptr_t)-1) << USER_DATA_TYPE_SHIFT)
#define USER_DATA_INDEX (~USER_DATA_TYPE)
#define USER_DATA_TYPE_PLATFORM ((uintptr_t)0x1)
// indicator that this Box2D fixture is a platform
#define USER_DATA_PLATFORM (USER_DATA_TYPE_PLATFORM << USER_DATA_TYPE_SHIFT)
typedef struct {
bool initialized;
float win_width, win_height; // width,height of window in pixels
v2 mouse_pos; // mouse position in Box2D (not GL) coordinates
float dt; // time in seconds since last frame
// physics time left unsimulated last frame
// (we need to always pass Box2D the same dt for consistency, so there
// will be some left over, if the frame time is not a multiple of the fixed time step)
float time_residue;
m4 transform; // the transform for converting our coordinates to GL coordinates
m4 inv_transform; // inverse of transform (for converting GL coordinates to our coordinates)
GL gl; // gl functions
ShaderPlatform shader_platform;
ShaderBall shader_ball;
bool building; // is the user building a setup?
bool simulating; // are we simulating the world's physics?
b2World *world; // Box2D world
Ball ball;
float bottom_y; // y-position of "floor" (if y goes below here, it's over)
float left_x; // y-position of left wall
Font font;
Platform platform_building; // the platform the user is currently placing
float platform_thickness;
u32 nplatforms;
#define MAX_PLATFORMS 1000
Platform platforms[MAX_PLATFORMS];
u32 tmp_mem_used; // this is not measured in bytes, but in MaxAligns
#define TMP_MEM_BYTES (4L<<20)
MaxAlign tmp_mem[TMP_MEM_BYTES / sizeof(MaxAlign)];
#if DEBUG
u32 magic_number;
#define MAGIC_NUMBER 0x1234ACAB
#endif
} State;
#endif // SIM_H_
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