#include <SDL2/SDL.h>
#include <glad/glad.h>
#include <stdio.h>
#include <memory.h>
#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#include <stdint.h>
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t s8;
typedef int16_t s16;
typedef int32_t s32;
typedef int64_t s64;
typedef float r32;
typedef double r64;
typedef u8 b8;
#include "memory/arena.h"
#include "math.h"
struct Str256 {
char buffer[256];
u32 size;
};
void str_init(Str256 *str) {
memset(str->buffer, 0, 256*sizeof(unsigned char));
str->size = 0;
}
Str256 str256(const char *cstr) {
Str256 str;
str_init(&str);
u32 size = strlen(cstr);
memcpy((void*)str.buffer, (void*)cstr, size);
str.size = size;
return str;
}
void str_pushc(Str256 *str, char c) {
if (str->size + 1 > 256) {
return;
}
str->buffer[str->size] = c;
str->size++;
}
void str_push256(Str256 *str, Str256 to_push) {
u32 available_space = 256 - str->size;
SDL_assert(available_space >= to_push.size);
memcpy((void*)&str->buffer[str->size], (void*)to_push.buffer, to_push.size);
str->size += to_push.size;
}
void str_clear(Str256 *str) {
memset(str->buffer, 0, str->size * sizeof(unsigned char));
str->size = 0;
}
enum PMoveState {
NO_MOVE = 0,
MOVE = 1,
FALL_MOVE = 2,
};
enum PlatformKey {
PK_NIL = 0,
PK_W = 1,
PK_A = 2,
PK_S = 3,
PK_D = 4,
};
struct TextChar {
s64 lsb;
s64 advance;
Vec2 box0;
Vec2 box1;
Vec2 size;
};
struct TextState {
r32 scale;
u32 pixel_size;
s32 ascent;
s32 descent;
s32 linegap;
u32 texture_atlas_id;
u32 sp;
u32 vao;
u32 vbo;
u32 chunk_size;
IVec2 box0;
IVec2 box1;
stbtt_fontinfo font;
s32* char_indexes;
Mat4* transforms;
TextChar* char_map;
};
#define BATCH_SIZE 2000
#define KB(x) (1024 * (x))
#define MB(x) (1024 * KB((x)))
#define GB(x) (1024 * MB((x)))
#include "array/array.cpp"
struct Rect {
Vec2 lb;
Vec2 rt;
};
#define PLAYER_Z -1.0f
#define OBSTACLE_Z -2.0f
#define GOAL_Z -3.0f
enum ENTITY_TYPE {
PLAYER = 0,
OBSTACLE = 1,
GOAL = 2,
INVERT_GRAVITY = 3,
TELEPORT = 4,
DEBUG_LINE = 5,
};
static r32 entity_z[10];
static Vec3 entity_colors[10];
struct Entity {
// @todo: set a base resolution and design the game elements around it
s32 id;
ENTITY_TYPE type;
// raw property values in pixels
Vec3 raw_position;
Vec2 raw_size;
// these properties will have scaling applied
Vec3 position;
Vec2 size;
Rect bounds;
// teleporter
u32 link_id; // which portal this is linked to
};
struct EntityInfo {
u32 id;
u32 index; // index into Level->Entities array
};
struct EntityInfoArr {
EntityInfo *buffer;
u32 size;
u32 capacity;
};
#define LEVEL_MAX_ENTITIES 100
const int level_count = 2;
static const char* base_level_path = "./levels/";
static const char *level_names[20] = {
"level1.txt",
"level0.txt",
};
struct Level0x1 {
u32 version = 0x1;
u32 entity_count;
Entity *entities;
};
typedef struct Level0x1 Level;
struct GLRenderer {
// colored quad
b8 cq_init;
u32 cq_sp;
u32 cq_vao;
// camera
Vec3 preset_up_dir;
Mat4 cam_proj;
// ui camera
b8 ui_cam_update;
Vec3 ui_cam_pos;
Vec3 ui_cam_look;
Mat4 ui_cam_view;
// game camera
b8 cam_update;
Vec3 cam_pos;
Vec3 cam_look;
Mat4 cam_view;
// Batched cq
// batching buffer
u32 cq_batch_sp;
u32 cq_batch_vao;
u32 cq_batch_vbo;
u32 cq_batch_count;
r32_array cq_pos_batch;
r32_array cq_color_batch;
// Batched line
u32 line_sp;
u32 line_vao;
u32 line_vbo;
u32 line_batch_count;
r32_array line_pos_batch;
r32_array line_color_batch;
// ui text
TextState ui_text;
};
#include "renderer/renderer.h"
#include "renderer/renderer.cpp"
struct Controller {
b8 move_up;
b8 move_down;
b8 move_left;
b8 move_right;
b8 jump;
b8 toggle_gravity;
};
struct FrameTimer {
u64 tCurr;
u64 tPrev;
r64 tDeltaMS;
r64 tDelta;
u64 tFreq;
};
FrameTimer frametimer() {
FrameTimer res = {};
res.tFreq = SDL_GetPerformanceFrequency();
res.tCurr = SDL_GetPerformanceCounter();
res.tPrev = res.tCurr;
res.tDelta = (r64)(res.tCurr - res.tPrev) / (r64)res.tFreq;
res.tDeltaMS = res.tDelta * 1000.0f;
return res;
}
void update_frame_timer(FrameTimer *ft) {
ft->tPrev = ft->tCurr;
ft->tCurr = SDL_GetPerformanceCounter();
ft->tDelta = (r64)(ft->tCurr - ft->tPrev) / (r64)ft->tFreq;
ft->tDeltaMS = ft->tDelta * 1000.0f;
}
void enforce_frame_rate(FrameTimer *ft, u32 target) {
r64 target_frametime = SDL_floor(
1000.0f/(r64)target
);
while(ft->tDeltaMS < target_frametime) {
ft->tCurr = SDL_GetPerformanceCounter();
ft->tDelta = (r64)(ft->tCurr - ft->tPrev) / ft->tFreq;
ft->tDeltaMS = ft->tDelta * 1000.0f;
// pass time
continue;
}
}
struct GameState {
// the default size the game is designed around
Vec2 world_size;
Vec2 screen_size;
// the scaling factor to increase/decrease size of game assets
Vec2 render_scale;
// the smallest size a unit can be. This scales with render_scale
Vec2 atom_size;
Rect camera_bounds;
// level
// 0: in progress, 1: complete
b8 level_state;
s32 level_index;
Str256 level_path_base;
Str256 level_name;
Level game_level;
EntityInfo player;
EntityInfo goal;
EntityInfoArr obstacles;
// gameplay
b8 flip_gravity;
b8 inside_teleporter;
b8 teleporting;
r32 gravity_diry;
r32 effective_force;
Vec2 player_velocity;
r64 gravity_flip_timer;
};
Rect rect(Vec3 position, Vec2 size) {
Rect r = {0};
r.lb.x = position.x;
r.lb.y = position.y;
r.rt.x = position.x + size.x;
r.rt.y = position.y + size.y;
return r;
}
b8 aabb_collision_rect(Rect a, Rect b) {
r32 a_left = a.lb.x;
r32 a_bottom = a.lb.y;
r32 a_right = a.rt.x;
r32 a_top = a.rt.y;
r32 b_left = b.lb.x;
r32 b_bottom = b.lb.y;
r32 b_right = b.rt.x;
r32 b_top = b.rt.y;
return !(
a_left > b_right || a_right < b_left ||
a_top < b_bottom || a_bottom > b_top);
}
Entity get_entity_by_id(GameState state, u32 id) {
Entity res;
res.id = -1;
for (int i = 0; i < state.game_level.entity_count; i++) {
Entity e = state.game_level.entities[i];
if (e.id == id) {
res = e;
break;
}
}
// We should always have the entity we are trying to look for
SDL_assert(res.id != -1);
return res;
}
void load_level(GameState *state, Arena *level_arena, Str256 level_path) {
// @step: initialise level state variables
arena_clear(level_arena);
memset(&state->game_level, 0, sizeof(Level));
state->level_state = 0;
size_t fsize;
char* level_data = (char*)SDL_LoadFile(level_path.buffer, &fsize);
SDL_assert(fsize != 0);
u32 feature_flag = 0;
u32 entity_flag = 0;
u32 entity_id_counter = 0;
Str256 level_property;
str_init(&level_property);
Entity level_entity;
b8 is_comment = 0;
u32 prop_flag = 0;
u32 sub_prop_flag = 0;
// @note: just decide beforehand, that a level should allow (AT MAX) 100 elements
// this should be way overkill
state->game_level.entities = (Entity*)arena_alloc(level_arena, LEVEL_MAX_ENTITIES*sizeof(Entity));
for (int i = 0; i < fsize; i++) {
char ele = level_data[i];
// handling comments in level file
if (ele == '#') {
is_comment = true;
continue;
}
if (ele == '\n' && is_comment) {
is_comment = false;
continue;
}
if (is_comment) {
continue;
}
if (ele == '\t' || ele == ' ' || ele == '\n') {
if (level_property.size == 0) {
// @note: this will help ignore ' ', '\t', '\n' characters
// allowing us to type those in the file for better readability
continue;
}
switch (prop_flag) {
case 0: {
state->game_level.version = strtol(level_property.buffer, NULL, 16);
str_clear(&level_property);
prop_flag++;
continue;
} break;
case 1: {
switch (sub_prop_flag) {
case 0: {
// auto-generated id
// @note: will be overwritten when id is explicitly defined
level_entity.id = entity_id_counter;
// type
level_entity.type = (ENTITY_TYPE)strtol(level_property.buffer, NULL, 10);
// set z index based off of entity type
level_entity.raw_position.z = entity_z[level_entity.type];
} break;
case 1: {
// posx
level_entity.raw_position.x = strtol(level_property.buffer, NULL, 10);
} break;
case 2: {
// posy
level_entity.raw_position.y = strtol(level_property.buffer, NULL, 10);
} break;
case 3: {
// sizex
level_entity.raw_size.x = strtol(level_property.buffer, NULL, 10);
} break;
case 4: {
// sizey
level_entity.raw_size.y = strtol(level_property.buffer, NULL, 10);
} break;
case 5: {
// pre-defined id
level_entity.id = strtol(level_property.buffer, NULL, 10);
} break;
case 6: {
// linked id
level_entity.link_id = strtol(level_property.buffer, NULL, 10);
}
default: {
} break;
}
str_clear(&level_property);
sub_prop_flag++;
if (ele == '\n') {
state->game_level.entities[state->game_level.entity_count] = level_entity;
state->game_level.entity_count++;
entity_id_counter++;
sub_prop_flag = 0;
memset(&level_entity, 0, sizeof(Entity));
}
SDL_assert(state->game_level.entity_count <= LEVEL_MAX_ENTITIES);
continue;
}
default: {
} break;
}
}
str_pushc(&level_property, ele);
}
// @function: load_entities_info and scale
state->obstacles.buffer = (EntityInfo*)arena_alloc(level_arena, state->game_level.entity_count*sizeof(EntityInfo));
state->obstacles.size = 0;
state->obstacles.capacity = state->game_level.entity_count;
for (u32 i = 0; i < state->game_level.entity_count; i++) {
Entity e = state->game_level.entities[i];
e.position = e.raw_position;
e.size = e.raw_size * state->atom_size * state->render_scale.x;
e.bounds = rect(e.position, e.size);
EntityInfo o;
o.id = e.id;
o.index = i;
switch (e.type) {
case PLAYER: {
state->player = o;
} break;
case OBSTACLE:
case INVERT_GRAVITY: {
state->obstacles.buffer[state->obstacles.size] = o;
state->obstacles.size++;
} break;
case GOAL: {
state->goal = o;
} break;
default: {
} break;
}
state->game_level.entities[i] = e;
}
SDL_free(level_data);
}
void setup_level(GameState *state, GLRenderer *renderer, Arena *arena)
{
Str256 _level_name = str256(level_names[state->level_index]);
Str256 level_path = state->level_path_base;
str_push256(&level_path, _level_name);
load_level(state, arena, level_path);
Entity player = state->game_level.entities[state->player.index];
renderer->cam_pos.x = player.position.x - (40.0f * state->render_scale.x);
renderer->cam_pos.y = player.position.y - (40.0f * state->render_scale.y);
state->effective_force = 0.0f;
state->player_velocity = Vec2{0.0f, 0.0f};
state->gravity_diry = 1.0f;
renderer->cam_update = 1;
}
Vec2 get_move_dir(Controller c) {
Vec2 dir = {};
if (c.move_up) {
dir.y = 1.0f;
}
if (c.move_down) {
dir.y = -1.0f;
}
if (c.move_left) {
dir.x = -1.0f;
}
if (c.move_right) {
dir.x = 1.0f;
}
return dir;
}
void update_camera(GLRenderer *renderer) {
if (renderer->cam_update == true) {
renderer->cam_view = camera_create4m(
renderer->cam_pos,
add3v(renderer->cam_pos, renderer->cam_look),
renderer->preset_up_dir
);
renderer->cam_update = false;
}
}
Vec2 get_screen_position_from_percent(GameState state, Vec2 v) {
Vec2 screen_pos = v;
screen_pos.x = state.render_scale.x*state.screen_size.x*v.x/100.0f;
screen_pos.y = state.render_scale.y*state.screen_size.y*v.y/100.0f;
return screen_pos;
}
int main(int argc, char* argv[])
{
u32 base_scr_width = 1024;
u32 base_scr_height = 768;
u32 scr_width = 1280;
u32 scr_height = 960;
{
// entity configs setup
entity_colors[PLAYER] = Vec3{0.45f, 0.8f, 0.2f};
entity_colors[OBSTACLE] = Vec3{1.0f, 1.0f, 1.0f};
entity_colors[GOAL] = Vec3{ 0.93f, 0.7f, 0.27f };
entity_colors[INVERT_GRAVITY] = Vec3{1.0f, 0.0f, 0.0f};
entity_colors[TELEPORT] = Vec3{0.0f, 0.0f, 0.0f};
entity_z[DEBUG_LINE] = -4.0f;
r32 entity_base_z = -5.0f;
entity_z[OBSTACLE] = entity_base_z - 1.0f;
entity_z[GOAL] = entity_base_z - 2.0f;
{
entity_z[TELEPORT] = entity_base_z - 3.0f;
entity_z[INVERT_GRAVITY] = entity_base_z - 3.0f;
}
entity_z[PLAYER] = entity_base_z - 4.0f;
}
if (SDL_Init(SDL_INIT_VIDEO) != 0)
{
printf("Error initialising SDL2: %s\n", SDL_GetError());
return -1;
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 5);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_Window* window = SDL_CreateWindow("simple platformer",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
scr_width, scr_height,
SDL_WINDOW_OPENGL);
SDL_GLContext context = SDL_GL_CreateContext(window);
if (!context)
{
printf("ERROR :: OpenGL context creation failed: %s\n", SDL_GetError());
return -1;
}
// load glad
if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress)) {
printf("ERROR :: Failed to initialize Glad\n");
return -1;
}
// vsync controls: 0 = OFF | 1 = ON (Default)
SDL_GL_SetSwapInterval(0);
GLRenderer renderer;
memset(&renderer, 0, sizeof(GLRenderer));
u32 pos_ele_count = BATCH_SIZE * 4*6;
u32 color_ele_count = BATCH_SIZE * 3*6;
// 1GB <= (((1b*1024)kb*1024)mb*1024)mb
size_t mem_size = GB(1);
void* batch_memory = calloc(mem_size, sizeof(r32));
Arena batch_arena;
// quad batch buffers
arena_init(&batch_arena, (unsigned char*)batch_memory, mem_size*sizeof(r32));
array_init(&batch_arena, &(renderer.cq_pos_batch), pos_ele_count);
array_init(&batch_arena, &(renderer.cq_color_batch), color_ele_count);
// line batch buffers
u32 line_pos_ele_count = BATCH_SIZE * 4 * 2;
u32 line_color_ele_count = BATCH_SIZE * 3 * 2;
array_init(&batch_arena, &(renderer.line_pos_batch), line_pos_ele_count);
array_init(&batch_arena, &(renderer.line_color_batch), line_color_ele_count);
u32 quad_sp = gl_shader_program_from_path(
"./source/shaders/colored_quad.vs.glsl",
"./source/shaders/colored_quad.fs.glsl"
);
u32 ui_text_sp = gl_shader_program_from_path(
"./source/shaders/ui_text.vs.glsl",
"./source/shaders/ui_text.fs.glsl"
);
u32 cq_batch_sp = gl_shader_program_from_path(
"./source/shaders/cq_batched.vs.glsl",
"./source/shaders/cq_batched.fs.glsl"
);
u32 quad_vao = gl_setup_colored_quad(quad_sp);
renderer.cq_sp = quad_sp;
renderer.cq_vao = quad_vao;
renderer.cq_batch_sp = cq_batch_sp;
gl_setup_colored_quad_optimized(&renderer, cq_batch_sp);
renderer.line_sp = cq_batch_sp;
gl_setup_line(&renderer, cq_batch_sp);
r32 render_scale = 1.0f; //(r32)scr_width / (r32)base_scr_width;
{
// ==========
// setup text
// setup stb_truetype stuff
size_t fsize = 0;
unsigned char *font_buffer = (unsigned char*)SDL_LoadFile("./assets/fonts/Roboto.ttf", &fsize);
stbtt_InitFont(&renderer.ui_text.font, font_buffer, 0);
renderer.ui_text.pixel_size = 32*render_scale;
renderer.ui_text.sp = ui_text_sp;
renderer.ui_text.chunk_size = 32;
renderer.ui_text.transforms = (Mat4*)malloc(
renderer.ui_text.chunk_size*sizeof(Mat4)
);
renderer.ui_text.char_indexes = (s32*)malloc(
renderer.ui_text.chunk_size*sizeof(s32)
);
renderer.ui_text.char_map = (TextChar*)malloc(
128*sizeof(TextChar)
);
// setup_text
TextState *uistate = &(renderer.ui_text);
uistate->scale = stbtt_ScaleForPixelHeight(&uistate->font, uistate->pixel_size);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glGenTextures(1, &(uistate->texture_atlas_id));
glBindTexture(GL_TEXTURE_2D_ARRAY, uistate->texture_atlas_id);
// generate texture
glTexImage3D(
GL_TEXTURE_2D_ARRAY,
0,
GL_R8,
uistate->pixel_size,
uistate->pixel_size,
128,
0,
GL_RED,
GL_UNSIGNED_BYTE,
0);
s32 ascent, descent, linegap = 0;
stbtt_GetFontVMetrics(&uistate->font, &ascent, &descent, &linegap);
uistate->ascent = ascent;
uistate->descent = descent;
uistate->linegap = linegap;
s32 x0, y0, x1, y1 = 0;
stbtt_GetFontBoundingBox(&uistate->font, &x0, &y0, &x1, &y1);
uistate->box0 = IVec2{x0, y0};
uistate->box1 = IVec2{x1, y1};
u32 pixel_size = uistate->pixel_size;
unsigned char *bitmap_buffer = (unsigned char*)calloc(pixel_size * pixel_size, sizeof(unsigned char));
for (u32 c = 0; c < 128; c++)
{
// @resume: working on replicating the
// freetype gl_setup_text function
s32 advance, lsb = 0;
stbtt_GetCodepointHMetrics(&uistate->font, c, &advance, &lsb);
s32 bx0, bx1, by0, by1 = 0;
stbtt_GetCodepointBitmapBox(
&uistate->font, c,
uistate->scale, uistate->scale,
&bx0, &by0,
&bx1, &by1
);
s32 width = bx1 - bx0;
s32 height = by1 - by0;
stbtt_MakeCodepointBitmap(
&uistate->font,
bitmap_buffer,
width,
height,
width,
uistate->scale,
uistate->scale,
c);
glTexSubImage3D(
GL_TEXTURE_2D_ARRAY,
0,
0, 0, // x, y offset
int(c),
width,
height,
1,
GL_RED,
GL_UNSIGNED_BYTE,
bitmap_buffer
);
// set texture options
glTexParameteri(
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE
);
glTexParameteri(
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE
);
glTexParameteri(
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR
);
glTexParameteri(
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR
);
TextChar tc;
tc.size = Vec2{
(r32)width, (r32)height
};
tc.box0 = Vec2{
(r32)bx0, (r32)by0
};
tc.box1 = Vec2{
(r32)bx1, (r32)by1
};
tc.advance = advance;
tc.lsb = (s32)lsb;
uistate->char_map[c] = tc;
}
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
r32 vertices[] = {
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f
};
glGenVertexArrays(1, &(uistate->vao));
glGenBuffers(1, &(uistate->vbo));
glBindVertexArray(uistate->vao);
glBindBuffer(GL_ARRAY_BUFFER, uistate->vbo);
glBufferData(
GL_ARRAY_BUFFER,
sizeof(vertices),
vertices,
GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// ============
// setup camera
Vec3 preset_up_dir = Vec3{0.0f, 1.0f, 0.0f};
renderer.preset_up_dir = preset_up_dir;
renderer.cam_update = false;
renderer.cam_pos = Vec3{0.0f, 0.0f, 1.0f};
renderer.cam_look = camera_look_around(TO_RAD(0.0f), -TO_RAD(90.0f));
renderer.cam_view = camera_create4m(
renderer.cam_pos,
add3v(renderer.cam_pos, renderer.cam_look), renderer.preset_up_dir
);
renderer.cam_proj = orthographic4m(
0.0f, (r32)scr_width*render_scale,
0.0f, (r32)scr_height*render_scale,
0.1f, 15.0f
);
// fixed_screen_camera
renderer.ui_cam_update = 1;
renderer.ui_cam_pos = renderer.cam_pos;
renderer.ui_cam_look = renderer.cam_look;
renderer.ui_cam_view = renderer.cam_view;
// @thinking: level object handling
// there should be a most smallest supported unit
// smallest_size: 16x16
// object placement should be in pixels
// in order to scale to different resolutions it should be multiplied by
// scaling factor
Vec2 atom_size = Vec2{64.0f, 64.0f};
GameState state = {0};
state.atom_size = atom_size;
state.world_size = Vec2{(r32)scr_width, (r32)scr_height};
state.screen_size = Vec2{(r32)scr_width, (r32)scr_height};
state.render_scale = vec2(render_scale);
Vec2 camera_screen_size = state.screen_size * state.render_scale;
state.level_path_base = str256(base_level_path);
// @section: gameplay variables
r32 motion_scale = 2.0f;
state.gravity_diry = 1.0f;
r32 fall_accelx = 3.0f*motion_scale;
r32 move_accelx = 4.0f*motion_scale;
r32 freefall_accel = -11.8f*motion_scale;
r32 jump_force = 6.5f*motion_scale;
state.effective_force = 0.0f;
Vec2 camera_pan_slow = Vec2{2.0f, 2.0f}*motion_scale;
state.player_velocity = Vec2{0.0f, 0.0f};
Vec2 p_move_dir = Vec2{0.0f, 0.0f};
// direction in which player is effectively travelling
Vec2 p_motion_dir = Vec2{0.0f, 0.0f};
// @todo: rename rect members (makes more sense)
// tl -> lt
// br -> rb
state.camera_bounds = rect(renderer.cam_pos, camera_screen_size);
// @section: level elements
// @step: init_level_arena
size_t max_level_entities = 255;
size_t arena_mem_size = GB(1);
void* level_mem = malloc(arena_mem_size);
Arena level_arena;
size_t arena_size = max_level_entities*(sizeof(Entity) + sizeof(EntityInfo));
arena_init(&level_arena, (unsigned char*)level_mem, arena_size);
setup_level(&state, &renderer, &level_arena);
// gameplay camera movement stuff
Vec2 cam_lt_limit = {0};
Vec2 cam_rb_limit = {0};
cam_lt_limit = get_screen_position_from_percent(
state, Vec2{30.0f, 70.0f}
);
cam_rb_limit = get_screen_position_from_percent(
state, Vec2{70.0f, 30.0f}
);
Controller controller = {0};
r32 key_down_time[5] = {0.0f, 0.0f, 0.0f, 0.0f, 0.0f};
b8 is_key_down_x = false;
// gravity calculations
b8 was_colliding = 0;
b8 collidex = 0;
b8 collidey = 0;
b8 is_gravity = 0;
b8 game_running = 1;
FrameTimer timer = frametimer();
#if AUDIO
// @resume: audio has clicky sound, I need to figure generate audio clips that are better.
// Why is this difficult
// @section: audio_setup
ma_result result;
ma_engine engine;
result = ma_engine_init(NULL, &engine);
if (result != MA_SUCCESS) {
SDL_Log("Failed to initialise audio engine\n");
return -1;
}
ma_sound jump_sound;
ma_sound landing_sound;
ma_sound level_complete_sound;
const char *sound_path = "assets/audio/jump.wav";
result = ma_sound_init_from_file(&engine, sound_path, 0, NULL, NULL, &jump_sound);
if (result != MA_SUCCESS) {
SDL_Log("Failed to load sound: %s\n", sound_path);
return -1;
}
sound_path = "assets/audio/landing.wav";
result = ma_sound_init_from_file(&engine, sound_path, 0, NULL, NULL, &landing_sound);
if (result != MA_SUCCESS) {
SDL_Log("Failed to load sound: %s\n", sound_path);
return -1;
}
sound_path = "assets/audio/level_complete.wav";
result = ma_sound_init_from_file(&engine, sound_path, 0, NULL, NULL, &level_complete_sound);
if (result != MA_SUCCESS) {
SDL_Log("Failed to load sound: %s\n", sound_path);
return -1;
}
#endif
while (game_running)
{
controller.jump = 0;
controller.toggle_gravity = 0;
IVec2 mouse_position;
IVec2 mouse_position_world;
IVec2 mouse_position_clamped;
SDL_Event ev;
while(SDL_PollEvent(&ev))
{
switch(ev.type)
{
case (SDL_QUIT):
{
game_running = 0;
} break;
case (SDL_MOUSEMOTION):
{
SDL_GetMouseState(&mouse_position.x, &mouse_position.y);
// flip mouse y to map it Y at Top -> Y at Bottom (like in maths)
mouse_position.y = scr_height*state.render_scale.y - mouse_position.y;
// get mouse world position
mouse_position_world.x = mouse_position.x + (s32)renderer.cam_pos.x;
mouse_position_world.y = mouse_position.y + (s32)renderer.cam_pos.y;
// clamp mouse position based off of the grids we draw (this will make level object placement easier)
mouse_position_clamped.x = mouse_position_world.x - (mouse_position_world.x % (s32)(atom_size.x));
mouse_position_clamped.y = mouse_position_world.y - (mouse_position_world.y % (s32)(atom_size.y));
} break;
case (SDL_KEYDOWN):
{
if (ev.key.keysym.sym == SDLK_w)
{
controller.move_up = 1;
}
if (ev.key.keysym.sym == SDLK_a)
{
controller.move_left = 1;
key_down_time[PK_A] = timer.tCurr;
}
if (ev.key.keysym.sym == SDLK_s)
{
controller.move_down = 1;
}
if (ev.key.keysym.sym == SDLK_d)
{
controller.move_right = 1;
key_down_time[PK_D] = timer.tCurr;
}
if (ev.key.keysym.sym == SDLK_SPACE)
{
controller.jump = 1;
}
if (ev.key.keysym.sym == SDLK_g)
{
controller.toggle_gravity = 1;
}
// @todo: fix this janky manual camera movement
if (ev.key.keysym.sym == SDLK_HOME)
{
state.level_index = MAX(state.level_index - 1, 0);
setup_level(&state, &renderer, &level_arena);
}
if (ev.key.keysym.sym == SDLK_END)
{
state.level_index = MIN(state.level_index + 1, level_count-1);
setup_level(&state, &renderer, &level_arena);
}
if (ev.key.keysym.sym == SDLK_F5)
{
setup_level(&state, &renderer, &level_arena);
}
#if CAM_MANUAL_MOVE
if (ev.key.keysym.sym == SDLK_LEFT)
{
renderer.cam_pos.x -= 40.0f * state.render_scale.x;
renderer.cam_update = true;
}
if (ev.key.keysym.sym == SDLK_RIGHT)
{
renderer.cam_pos.x += 40.0f * state.render_scale.x;
renderer.cam_update = true;
}
if (ev.key.keysym.sym == SDLK_UP)
{
renderer.cam_pos.y += 40.0f * state.render_scale.x;
renderer.cam_update = true;
}
if (ev.key.keysym.sym == SDLK_DOWN)
{
renderer.cam_pos.y -= 40.0f * state.render_scale.x;
renderer.cam_update = true;
}
#endif
} break;
case (SDL_KEYUP):
{
if (ev.key.keysym.sym == SDLK_w)
{
controller.move_up = 0;
}
if (ev.key.keysym.sym == SDLK_a)
{
controller.move_left = 0;
key_down_time[PK_A] = 0.0f;
}
if (ev.key.keysym.sym == SDLK_s)
{
controller.move_down = 0;
}
if (ev.key.keysym.sym == SDLK_d)
{
controller.move_right = 0;
key_down_time[PK_D] = 0.0f;
}
if (ev.key.keysym.sym == SDLK_i)
{
state.flip_gravity = 1;
}
} break;
default:
{
break;
}
}
}
// @section: state based loading
if (state.level_state == 1) {
state.level_index = clampi(state.level_index+1, 0, level_count-1);
setup_level(&state, &renderer, &level_arena);
}
// @section: input processing
if (controller.toggle_gravity)
{
is_gravity = !is_gravity;
state.player_velocity = Vec2{0.0f, 0.0f};
p_move_dir.x = 0.0f;
state.effective_force = 0.0f;
p_motion_dir = {0};
}
if (state.flip_gravity)
{
// @resume: I need to add a buffer zone, something like some iframes, so that once I touch a gravity block
// I don't reflip gravity if I am in contact with the block for 1-2 seconds right after first colliding
state.gravity_diry = state.gravity_diry > 0.0f ? -0.8f : 1.0f;
//gravity_diry *= -1.0f;
state.flip_gravity = 0;
}
if (controller.move_up)
{
p_move_dir.y = 1.0f;
}
if (controller.move_down)
{
p_move_dir.y = -1.0f;
}
PlatformKey horizontal_move = PK_NIL;
is_key_down_x = false;
if (
key_down_time[PK_A] != 0.0f ||
key_down_time[PK_D] != 0.0f
) {
horizontal_move = (
key_down_time[PK_A] > key_down_time[PK_D] ? PK_A : PK_D
);
}
if (horizontal_move == PK_A && controller.move_left)
{
p_move_dir.x = -1.0f;
is_key_down_x = true;
}
if (horizontal_move == PK_D && controller.move_right)
{
p_move_dir.x = 1.0f;
is_key_down_x = true;
}
// @section: gravity
Vec2 pd_1 = Vec2{0.0f, 0.0f};
p_motion_dir = {0};
if (collidey)
{
state.player_velocity.y = 0.0f;
}
if (collidex)
{
state.player_velocity.x = 0.0f;
}
if (is_gravity)
{
// @section: game_movement
// calculate force acting on player
if (collidey) {
// @note: can I reduce the states here like I did in the falling case
// without separate checks
if (collidex) {
state.effective_force = 0.0f;
} else if (is_key_down_x) {
r32 updated_force = (
state.effective_force + p_move_dir.x*move_accelx*timer.tDelta
);
updated_force = clampf(
updated_force, -move_accelx, move_accelx
);
state.effective_force = updated_force;
} else {
r32 friction = 0.0f;
if (state.effective_force > 0.0f) {
friction = -move_accelx*timer.tDelta;
} else if (state.effective_force < 0.0f) {
friction = move_accelx*timer.tDelta;
}
r32 updated_force = state.effective_force + friction;
state.effective_force = (
ABS(updated_force) < 0.5f ?
0.0f : updated_force
);
}
} else {
r32 smoothing_force = state.effective_force;
r32 net_force = 0.0f;
r32 active_force = 0.0f;
if (!collidex) {
net_force = state.effective_force;
if (controller.jump) {
// @step: if in the air and jumping in a different direction
// allow more immediate feeling force, instead of the jump adding into net_force
// which gives off, more of a floaty feeling.
r32 threshed_force = roundf(net_force);
b8 move_dir_different = (threshed_force >= 0 && p_move_dir.x < 0) || (threshed_force <= 0 && p_move_dir.x > 0);
if (move_dir_different) {
active_force = p_move_dir.x*fall_accelx/2.0f;
net_force = active_force;
}
} else {
if (is_key_down_x) {
// player is slowing down, in that case, we allow this movement.
b8 move_dir_opposite = (net_force > 0 && p_move_dir.x < 0) || (net_force < 0 && p_move_dir.x > 0);
if (move_dir_opposite || ABS(net_force) < fall_accelx*0.15f)
{
active_force = p_move_dir.x*fall_accelx*timer.tDelta;
net_force = clampf(net_force + active_force, -fall_accelx, fall_accelx);
}
}
if (ABS(net_force) >= fall_accelx) {
// @note: air resistance
// (arbitrary force in opposite direction to reduce speed)
// reason: seems that it would work well for the case where
// player moves from platform move to free_fall
// since the max speed in respective stages is different this can
// function as a speed smoother, without too many checks and
// explicit checking
b8 is_force_pos = state.effective_force > 0.0f;
b8 is_force_neg = state.effective_force < 0.0f;
r32 friction = 0.0f;
if (is_force_pos) {
friction = -fall_accelx*timer.tDelta;
} else if (is_force_neg) {
friction = fall_accelx*timer.tDelta;
}
net_force += friction;
}
}
}
state.effective_force = net_force;
}
{
// horizontal motion setting
r32 dx1 = state.effective_force;
if ( dx1 == 0.0f ) {
p_move_dir.x = 0.0f;
}
if (dx1 < 0.0f) {
p_motion_dir.x = -1.0f;
} else if (dx1 > 0.0f) {
p_motion_dir.x = 1.0f;
}
state.player_velocity.x = dx1;
pd_1.x = dx1;
}
{
// vertical motion when falling
r32 dy1 = state.player_velocity.y;
dy1 = dy1 + state.gravity_diry * freefall_accel * timer.tDelta;
if (controller.jump) {
dy1 = state.gravity_diry*jump_force;
if (!collidey) {
// if we are in the air, the jump force is 75% of normal
dy1 = state.gravity_diry * jump_force * 0.75f;
}
}
if (dy1 < state.gravity_diry * -0.01f) {
p_motion_dir.y = -state.gravity_diry;
} else if (dy1 > state.gravity_diry * 0.01f) {
p_motion_dir.y = state.gravity_diry;
}
state.player_velocity.y = dy1;
pd_1.y = dy1;
}
}
else
{
// @no_clip_movement
Vec2 dir = get_move_dir(controller);
pd_1 = dir * 8.0f * render_scale;
if (pd_1.x < 0.0f) {
p_motion_dir.x = -1.0f;
} else if (pd_1.x > 0.0f) {
p_motion_dir.x = 1.0f;
}
if (pd_1.y < 0.0f) {
p_motion_dir.y = -1.0f;
} else if (pd_1.y > 0.0f) {
p_motion_dir.y = 1.0f;
}
}
// @section: collision
Entity player = state.game_level.entities[state.player.index];
Vec3 next_player_position;
next_player_position.x = player.position.x + pd_1.x;
next_player_position.y = player.position.y + pd_1.y;
Rect player_next = rect(next_player_position, player.size);
b8 is_collide_x = 0;
b8 is_collide_y = 0;
for (u32 i = 0; i < state.obstacles.size; i++) {
// @step: check_obstacle_collisions
// @func: check_if_player_colliding_with_target
u32 index = state.obstacles.buffer[i].index;
Entity e = state.game_level.entities[index];
Rect target = e.bounds;
b8 t_collide_x = 0;
// need to adjust player position in case of vertical collisions
// so need to check which player side collides
b8 t_collide_bottom = 0;
b8 t_collide_top = 0;
r32 prev_left = player.bounds.lb.x;
r32 prev_bottom = player.bounds.lb.y;
r32 prev_right = player.bounds.rt.x;
r32 prev_top = player.bounds.rt.y;
r32 p_left = player_next.lb.x;
r32 p_bottom = player_next.lb.y;
r32 p_right = player_next.rt.x;
r32 p_top = player_next.rt.y;
r32 t_left = target.lb.x;
r32 t_bottom = target.lb.y;
r32 t_right = target.rt.x;
r32 t_top = target.rt.y;
b8 prev_collide_x = !(prev_left > t_right || prev_right < t_left);
b8 new_collide_target_top = (p_bottom < t_top && p_top > t_top);
b8 new_collide_target_bottom = (p_top > t_bottom && p_bottom < t_bottom);
if (prev_collide_x && new_collide_target_top) {
t_collide_top = 1;
}
if (prev_collide_x && new_collide_target_bottom) {
t_collide_bottom = 1;
}
b8 prev_collide_y = !(prev_top < t_bottom + 0.2f || prev_bottom > t_top);
b8 new_collide_x = !(p_right < t_left || p_left > t_right);
if (prev_collide_y && new_collide_x) {
t_collide_x = 1;
}
// @func: update_player_positions_if_sides_colliding
if (t_collide_top) {
player.position.y -= (prev_bottom - t_top - 0.1f);
} else if (t_collide_bottom) {
player.position.y += (t_bottom - prev_top - 0.1f);
}
if (e.type == INVERT_GRAVITY && (t_collide_x || t_collide_top || t_collide_bottom)) {
// @note: gravity inverter mechanic
// 1. touch block, gravity flips
// 2. for 2 second, after gravity is flipped, gravity will not be flipped
// (this will collapse various cases where the player is trying to reflip gravity,
// but immediate contact after flipping makes this awkward and infeasible)
if (state.gravity_flip_timer <= 0) {
state.gravity_flip_timer = 1000.0f;
state.flip_gravity = 1;
}
}
is_collide_x = is_collide_x || t_collide_x;
is_collide_y = is_collide_y || t_collide_top || t_collide_bottom;
}
if (!is_collide_x) {
player.position.x = next_player_position.x;
}
if (!is_collide_y) {
player.position.y = next_player_position.y;
}
// check collision with goal
if (!is_collide_x && !is_collide_y) {
Entity goal = state.game_level.entities[state.goal.index];
Rect target = goal.bounds;
state.level_state = aabb_collision_rect(player_next, target);
}
// @section: teleport
b8 inside_teleporter_now = 0;
b8 teleporting_now = state.teleporting;
Vec2 teleported_position = Vec2{player.position.x, player.position.y};
for (u32 i = 0; i < state.game_level.entity_count; i++) {
/*
* @note;
* TELEPORT START ...
* 1. go inside a teleport block, player marked as in block
* 2. hit teleport block center, player marked as teleporting
* 3. player teleported to new block
* 4. once player exits the new block, player marked as in block false
* 5. then player marked as teleporting false
* ... TELEPORT COMPLETE
*/
Entity e = state.game_level.entities[i];
if (e.type != TELEPORT) {
continue;
}
Rect target = e.bounds;
if (teleporting_now) {
// check if player is outside of this teleport block or not
b8 t_collide = aabb_collision_rect(player.bounds, target);
inside_teleporter_now |= t_collide;
continue;
}
// check if player is completely inside teleport block
b8 t_collide = aabb_collision_rect(player.bounds, target);
if (!t_collide) {
continue;
}
inside_teleporter_now |= t_collide;
// check if player x-axis is within teleport x-axis
Vec2 displacement;
displacement.x = player.position.x - e.position.x;
displacement.y = player.position.y - e.position.y;
if (ABS(displacement.x) <= 5.0f*render_scale) {
teleporting_now = 1;
{
// @step: teleport_player
Entity teleport_to = get_entity_by_id(state, e.link_id);
// set next position
teleported_position.x = teleport_to.position.x + displacement.x;
teleported_position.y = teleport_to.position.y + displacement.y;
// add displacement so it gives a smooth effect of just moving over to someplace
}
}
}
{
// update teleport variable
state.inside_teleporter = inside_teleporter_now;
state.teleporting = teleporting_now && state.inside_teleporter;
if (state.teleporting) {
player.position.x = teleported_position.x;
player.position.y = teleported_position.y;
}
}
{
state.gravity_flip_timer = MAX(state.gravity_flip_timer - timer.tDeltaMS, 0.0f);
}
{
// @step: update player variables
player.bounds = rect(player.position, player.size);
was_colliding = collidex || collidey;
collidex = is_collide_x;
collidey = is_collide_y;
state.game_level.entities[state.player.index] = player;
}
// @section: camera_update
{
// camera movement and handling
// Cases:
// - A new level loads, the camera position needs to be on the player
// (part of level loading) [Focus on Player]
// - Player is moving and camera needs to follow
// - Player has stopped moving and camera needs to slowly adjust (linearly)
// - Player teleports, camera needs to move to the player:
// - if player is within view camera needs to slowly adjust the player,
// and pan linearly until player is in level focus
// - if player is out of camera view, jump
// (linearly but slightly faster) to the player
// - If player is outside, pan quickly (linearly) to player
// - If player is at the boundary of a level,
// respect the level boundary and do not center the player.
// Pan camera, up until the edge of the level boundary.
// Do no move the camera beyond the level boundary.
//
// Based off of these cases, this is the behavior I can see:
// 1. Player is moving at the edges of the screen, follow.
// 2. Player is stopped, pan slowly until player is in the focus region
// (need to define focus region)
// 3. Player is outside the screen, pan to player
// (go from current camera position to player position linearly)
// @step: player is at the edge of the screen
// get players visible bounds (padding around the player to consider it be visible for the camera)
Vec2 vis_lb = player.bounds.lb - (Vec2{120.0f, 60.0f} * state.render_scale);
Vec2 vis_rt = player.bounds.rt + (Vec2{120.0f, 60.0f} * state.render_scale);
Rect vis_bounds;
vis_bounds.lb = vis_lb;
vis_bounds.rt = vis_rt;
Rect cam_bounds = state.camera_bounds;
Vec2 camera_center = Vec2{state.camera_bounds.rt.x/2.0f, state.camera_bounds.rt.y/2.0f};
Vec2 player_camera_offset = player.position.v2() - camera_center;
// check if vis_bounds inside camera_bounds
b8 is_player_in_camera = (
vis_bounds.lb.x >= cam_bounds.lb.x && vis_bounds.lb.y >= cam_bounds.lb.y &&
vis_bounds.rt.x <= cam_bounds.rt.x && vis_bounds.rt.y <= cam_bounds.rt.y
);
if (!is_player_in_camera) {
r32 stepx_multiplier = player_camera_offset.x < 0 ? -1.0f : 1.0f;
r32 stepy_multiplier = player_camera_offset.y < 0 ? -1.0f : 1.0f;
r32 camera_stepx = stepx_multiplier * MIN(ABS(player_camera_offset.x), camera_pan_slow.x);
r32 camera_stepy = stepy_multiplier * MIN(ABS(player_camera_offset.y), camera_pan_slow.y);
Vec2 distance_scaler;
{
// @step: calculate distance scaler
// @note: this is to help scale how quickly the camera needs to pan
// this is based off of how far the player is from the camera position.
// The reason this is discrete instead of continuous is to give better predictability
// (at this stage)
// @note: make this continuous, so it pans smoothly. Movement is jerky at step boundaries
u32 dist_stepx = (u32)SDL_floorf(ABS(player_camera_offset.x) / 100);
u32 dist_stepy = (u32)SDL_floorf(ABS(player_camera_offset.y) / 100);
if (dist_stepx >= 0 && dist_stepx < 4) {
distance_scaler.x = 8.0f;
} else if (dist_stepx >= 4 && dist_stepx < 8) {
distance_scaler.x = 6.0f;
} else {
distance_scaler.x = 4.0f;
}
if (dist_stepy >= 0 && dist_stepy < 4) {
distance_scaler.y = 8.0f;
} else if (dist_stepy >= 4 && dist_stepy < 8) {
distance_scaler.y = 6.0f;
} else {
distance_scaler.y = 4.0f;
}
}
renderer.cam_pos.x += camera_stepx*timer.tDeltaMS/distance_scaler.x;
renderer.cam_pos.y += camera_stepy*timer.tDeltaMS/distance_scaler.y;
renderer.cam_update = 1;
}
b8 player_moving_up = p_motion_dir.y == state.gravity_diry*1 && !is_collide_y;
b8 player_moving_down = p_motion_dir.y == state.gravity_diry*-1 && !is_collide_y;
player_camera_offset = player.position.v2() - renderer.cam_pos.v2();
// @step: player moving at edges of the screen
if (player_camera_offset.x <= cam_lt_limit.x && p_motion_dir.x == -1) {
renderer.cam_pos.x += pd_1.x;
renderer.cam_update = 1;
}
if (player_camera_offset.y >= cam_lt_limit.y &&
player_moving_up) {
renderer.cam_pos.y += pd_1.y;
renderer.cam_update = 1;
}
if (player_camera_offset.x >= cam_rb_limit.x && p_motion_dir.x == 1) {
renderer.cam_pos.x += pd_1.x;
renderer.cam_update = 1;
}
if (player_camera_offset.y <= cam_rb_limit.y &&
player_moving_down) {
renderer.cam_pos.y += pd_1.y;
renderer.cam_update = 1;
}
}
{
// @step: update camera variables
if (renderer.cam_update == true) {
renderer.cam_view = camera_create4m(
renderer.cam_pos,
add3v(renderer.cam_pos, renderer.cam_look),
renderer.preset_up_dir
);
renderer.cam_update = false;
state.camera_bounds = rect(renderer.cam_pos, camera_screen_size);
}
}
// output
#if AUDIO
// @section: audio
if (controller.jump) {
ma_sound_start(&jump_sound);
}
if ((collidex || collidey) && !was_colliding) {
//ma_sound_set_pitch(&landing_sound, 0.5f);
//ma_sound_set_volume(&landing_sound, 0.2);
ma_sound_start(&landing_sound);
}
if (state.level_state == 1) {
ma_sound_start(&level_complete_sound);
}
#endif
glClearColor(0.8f, 0.5f, 0.7f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// @section: rendering
// @step: render draw lines
{
// @step: draw vertical lines
s32 line_index = (s32)state.camera_bounds.lb.x/atom_size.x;
for (s32 x = state.camera_bounds.lb.x; x <= state.camera_bounds.rt.x; x += atom_size.x) {
s32 offset = line_index*atom_size.x - x;
Vec3 start = Vec3{
(r32)(x + offset),
state.camera_bounds.lb.y,
entity_z[DEBUG_LINE]
};
Vec3 end = Vec3{
(r32)(x + offset),
state.camera_bounds.rt.y,
entity_z[DEBUG_LINE]
};
gl_draw_line(
&renderer,
start,
end,
Vec3{0.1, 0.1, 0.1}
);
line_index++;
}
line_index = (s32)state.camera_bounds.lb.y/atom_size.y;
// @step: draw horizontal lines
for (s32 y = state.camera_bounds.lb.y; y <= state.camera_bounds.rt.y; y += atom_size.x) {
s32 offset = line_index * atom_size.y - y;
Vec3 start = Vec3{
state.camera_bounds.lb.x,
(r32)(y + offset),
entity_z[DEBUG_LINE]
};
Vec3 end = Vec3{
state.camera_bounds.rt.x,
(r32)(y + offset),
entity_z[DEBUG_LINE]
};
gl_draw_line(
&renderer,
start,
end,
Vec3{0.1, 0.1, 0.1}
);
line_index++;
}
gl_line_flush(&renderer);
}
#if 0
// render_entities
for (int i = 0; i < state.game_level.entity_count; i++) {
Entity entity = state.game_level.entities[i];
Vec3 entity_center = Vec3{
entity.position.x + entity.size.x/2.0f,
entity.position.y + entity.size.y/2.0f,
entity.position.z
};
Vec3 color = entity_colors[entity.type];
gl_draw_colored_quad_optimized(
&renderer,
entity_center,
entity.size,
color
);
}
gl_cq_flush(&renderer);
#endif
array_clear(&renderer.cq_pos_batch);
array_clear(&renderer.cq_color_batch);
renderer.cq_batch_count = 0;
// render ui text
{
Vec3 color = Vec3{1.0f, 1.0f, 1.0f};
// render_text
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glUseProgram(renderer.ui_text.sp);
if (renderer.ui_cam_update) {
glUniformMatrix4fv(
glGetUniformLocation(
renderer.ui_text.sp, "View"),
1, GL_FALSE, renderer.ui_cam_view.buffer);
glUniformMatrix4fv(
glGetUniformLocation(
renderer.ui_text.sp, "Projection"),
1, GL_FALSE, renderer.cam_proj.buffer);
renderer.ui_cam_update = 0;
}
glUniform3fv(
glGetUniformLocation(
renderer.ui_text.sp, "TextColor"),
1, color.data);
glBindVertexArray(renderer.ui_text.vao);
glBindTexture(
GL_TEXTURE_2D_ARRAY,
renderer.ui_text.texture_atlas_id);
glBindBuffer(GL_ARRAY_BUFFER, renderer.ui_text.vbo);
glActiveTexture(GL_TEXTURE0);
u32 running_index = 0;
r32 startx = 0.0f;
r32 starty = 0.0f;
r32 linex = startx;
r32 font_size = 32.0f;
r32 render_scale = font_size/renderer.ui_text.pixel_size;
r32 scale = renderer.ui_text.scale*font_size/renderer.ui_text.pixel_size;
memset(
renderer.ui_text.transforms,
0,
renderer.ui_text.chunk_size);
memset(
renderer.ui_text.char_indexes,
0,
renderer.ui_text.chunk_size);
char *text = "qhick brown jumps over lazy dog";
char *char_iter = text;
r32 baseline = -renderer.ui_text.box0.y*scale - font_size;
while (*char_iter != '\0') {
TextChar render_char = renderer.ui_text.char_map[*char_iter];
r32 xpos = linex + (scale * render_char.lsb);
r32 ypos = starty + (baseline - render_scale*render_char.box0.y);
Mat4 sc = scaling_matrix4m(font_size, font_size, 1.0f);
Mat4 tr = translation_matrix4m(xpos, ypos, 0);
Mat4 model = multiply4m(tr, sc);
renderer.ui_text.transforms[running_index] = model;
renderer.ui_text.char_indexes[running_index] =
int(*char_iter);
linex += (scale * render_char.advance);
char prev_char = *char_iter;
char_iter++;
char curr_char = *char_iter;
if (curr_char) {
s32 kern = scale * stbtt_GetCodepointKernAdvance(&renderer.ui_text.font, prev_char, curr_char);
linex += kern;
}
running_index++;
}
u32 render_count = running_index;
r32 transform_loc = glGetUniformLocation(
renderer.ui_text.sp, "LetterTransforms");
glUniformMatrix4fv(
transform_loc,
render_count,
GL_FALSE,
&(renderer.ui_text.transforms[0].buffer[0])
);
r32 texture_map_loc = glGetUniformLocation(
renderer.ui_text.sp, "TextureMap");
glUniform1iv(
texture_map_loc,
render_count,
renderer.ui_text.char_indexes);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, render_count);
running_index = 0;
memset(renderer.ui_text.transforms, 0, render_count);
memset(renderer.ui_text.char_indexes, 0, render_count);
}
#if FREETYPE
char level_state_output[50];
sprintf(level_state_output, "is level clear = %d", state.level_state);
gl_render_text(
&renderer,
level_state_output,
Vec2{600.0f, 900.0f},
28.0f,
Vec3{0.0f, 0.0f, 0.0f});
if (is_collide_x || is_collide_y)
{
gl_render_text(&renderer,
"is colliding",
Vec2{500.0f, 700.0f}, // position
28.0f, // size
Vec3{0.0f, 0.0f, 0.0f}); // color
char movedir_output[50];
sprintf(movedir_output, "move_dir = %f", p_move_dir.x);
gl_render_text(&renderer,
movedir_output,
Vec2{500.0f, 60.0f}, // position
28.0f, // size
Vec3{0.0f, 0.0f, 0.0f}); // color
char speed_output[50];
sprintf(speed_output, "%f pps", state.player_velocity.x);
gl_render_text(&renderer,
speed_output,
Vec2{500.0f, 100.0f}, // position
28.0f, // size
Vec3{0.0f, 0.0f, 0.0f}); // color
}
char fmt_buffer[50];
sprintf(fmt_buffer, "frametime: %f", timer.tDelta);
gl_render_text(&renderer,
fmt_buffer,
Vec2{900.0f, 90.0f}, // position
28.0f*render_scale, // size
Vec3{0.0f, 0.0f, 0.0f}); // color
//sprintf(fmt_buffer, "inside_teleporter: %d\nteleporting: %d", state.inside_teleporter, state.teleporting);
//gl_render_text(&renderer,
// fmt_buffer,
// Vec2{900.0f, 190.0f}, // position
// 28.0f*render_scale, // size
// Vec3{0.0f, 0.0f, 0.0f}); // color
sprintf(fmt_buffer, "GridX: %d, GridY: %d", mouse_position_clamped.x, mouse_position_clamped.y);
gl_render_text(
&renderer,
fmt_buffer,
Vec2{0.0f, 0.0f},
28.0f*render_scale,
Vec3{0.0f, 0.0f, 0.0f});
sprintf(fmt_buffer, "WorldMouseX: %d, WorldMouseY: %d", mouse_position_world.x, mouse_position_world.y);
gl_render_text(
&renderer,
fmt_buffer,
Vec2{0.0f, 40.0f},
28.0f*render_scale,
Vec3{0.0f, 0.0f, 0.0f});
#endif
SDL_GL_SwapWindow(window);
update_frame_timer(&timer);
enforce_frame_rate(&timer, 60);
}
//ma_engine_uninit(&engine);
free(level_mem);
free(batch_memory);
free(renderer.ui_text.transforms);
free(renderer.ui_text.char_indexes);
free(renderer.ui_text.char_map);
SDL_GL_DeleteContext(context);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}