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leif.c
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leif.c
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#include "include/leif/leif.h"
#include <cglm/mat4.h>
#include <cglm/types-struct.h>
#include <glad/glad.h>
#include <time.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#define STB_TRUETYPE_IMPLEMENTATION
#include <stb_truetype.h>
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#include <stb_image_resize2.h>
#include <GLFW/glfw3.h>
#include <libclipboard.h>
#include <locale.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <wchar.h>
#include <wctype.h>
#ifdef _WIN32
#define HOMEDIR "USERPROFILE"
#else
#define HOMEDIR (char*)"HOME"
#endif
#ifdef LF_GLFW
#ifndef GLFW_INCLUDE_NONE
#define GLFW_INCLUDE_NONE
#endif
#include <GLFW/glfw3.h>
#endif /* ifdef */
#define MAX(a, b) a > b ? a : b
#define MIN(a, b) a < b ? a : b
#define LF_TRACE(...) { printf("Leif: [TRACE]: "); printf(__VA_ARGS__); printf("\n"); }
#ifdef LF_DEBUG
#define LF_DEBUG(...) { printf("Leif: [DEBUG]: "); printf(__VA_ARGS__); printf("\n"); }
#else
#define LF_DEBUG(...)
#endif // LF_DEBUG
#define LF_INFO(...) { printf("Leif: [INFO]: "); printf(__VA_ARGS__); printf("\n"); }
#define LF_WARN(...) { printf("Leif: [WARN]: "); printf(__VA_ARGS__); printf("\n"); }
#define LF_ERROR(...) { printf("[LEIF ERROR]: "); printf(__VA_ARGS__); printf("\n"); }
#ifdef _MSC_VER
#define D_BREAK __debugbreak
#elif defined(__clang__) || defined(__GNUC__)
#define D_BREAK __builtin_trap
#else
#define D_BREAK
#endif
#ifdef _DEBUG
#define LF_ASSERT(cond, ...) { if(cond) {} else { printf("[LEIF]: Assertion failed: '"); printf(__VA_ARGS__); printf("' in file '%s' on line %i.\n", __FILE__, __LINE__); D_BREAK(); }}
#else
#define LF_ASSERT(cond, ...)
#endif // _DEBUG
#define LF_STACK_INIT_CAP 4
#ifdef LF_GLFW
#define MAX_KEYS GLFW_KEY_LAST
#define MAX_MOUSE_BUTTONS GLFW_MOUSE_BUTTON_LAST
#define KEY_CALLBACK_t GLFWkeyfun
#define MOUSE_BUTTON_CALLBACK_t GLFWmousebuttonfun
#define SCROLL_CALLBACK_t GLFWscrollfun
#define CURSOR_CALLBACK_t GLFWcursorposfun
#else
#define MAX_KEYS 0
#define MAX_MOUSE_BUTTONS 0
#define KEY_CALLBACK_t void*
#define MOUSE_BUTTON_CALLBACK_t void*
#define SCROLL_CALLBACK_t void*
#define CURSOR_CALLBACK_t void*
#endif
#define MAX_RENDER_BATCH 10000
#define MAX_TEX_COUNT_BATCH 32
#define MAX_KEY_CALLBACKS 4
#define MAX_MOUSE_BTTUON_CALLBACKS 4
#define MAX_SCROLL_CALLBACKS 4
#define MAX_CURSOR_POS_CALLBACKS 4
#define DJB2_INIT 5381
// -- Struct Defines ---
typedef struct {
uint32_t id;
} LfShader;
typedef struct {
vec2 pos; // 8 Bytes
vec4 border_color; // 16 Bytes
float border_width; // 4 Bytes
vec4 color; // 16 Bytes
vec2 texcoord; // 8 Bytes
float tex_index; // 4 Bytes
vec2 scale; // 8 Bytes
vec2 pos_px; // 8 Bytes
float corner_radius; // 4 Bytes
vec2 min_coord, max_coord; // 16 Bytes
} Vertex; // 88 Bytes per vertex
typedef struct {
bool keys[MAX_KEYS];
bool keys_changed[MAX_KEYS];
} LfKeyboard;
typedef struct {
bool buttons_current[MAX_MOUSE_BUTTONS];
bool buttons_last[MAX_MOUSE_BUTTONS];
double xpos, ypos, xpos_last, ypos_last, xpos_delta, ypos_delta;
bool first_mouse_press;
double xscroll_delta, yscroll_delta;
} LfMouse;
typedef struct {
bool is_dragging;
vec2s start_cursor_pos;
float start_scroll;
} DragState;
// State of input
typedef struct {
LfKeyboard keyboard;
LfMouse mouse;
// List of callbacks (user defined)
KEY_CALLBACK_t key_cbs[MAX_KEY_CALLBACKS];
MOUSE_BUTTON_CALLBACK_t mouse_button_cbs[MAX_MOUSE_BTTUON_CALLBACKS];
SCROLL_CALLBACK_t scroll_cbs[MAX_SCROLL_CALLBACKS];
CURSOR_CALLBACK_t cursor_pos_cbs[MAX_CURSOR_POS_CALLBACKS];
uint32_t key_cb_count, mouse_button_cb_count, scroll_cb_count, cursor_pos_cb_count;
} InputState;
// State of the batch renderer
typedef struct {
LfShader shader;
uint32_t vao, vbo, ibo;
uint32_t vert_count;
Vertex* verts;
vec4s vert_pos[4];
LfTexture textures[MAX_TEX_COUNT_BATCH];
uint32_t tex_index, tex_count,index_count;
} RenderState;
typedef struct {
LfUIElementProps* data;
uint32_t count, cap;
} PropsStack;
typedef struct {
bool init;
// Window
uint32_t dsp_w, dsp_h;
void* window_handle;
RenderState render;
InputState input;
LfTheme theme;
LfDiv current_div, prev_div;
int32_t current_line_height, prev_line_height;
vec2s pos_ptr, prev_pos_ptr;
// Pushable variables
LfFont* font_stack, *prev_font_stack;
LfUIElementProps div_props, prev_props_stack;
LfColor image_color_stack;
int64_t element_id_stack;
PropsStack props_stack;
// Event references
LfKeyEvent key_ev;
LfMouseButtonEvent mb_ev;
LfCursorPosEvent cp_ev;
LfScrollEvent scr_ev;
LfCharEvent ch_ev;
vec2s cull_start, cull_end;
LfTexture tex_arrow_down, tex_tick;
bool text_wrap, line_overflow, div_hoverable, input_grabbed;
uint64_t active_element_id;
float* scroll_velocity_ptr;
float* scroll_ptr;
LfDiv selected_div, selected_div_tmp, scrollbar_div, grabbed_div;
uint32_t drawcalls;
bool entered_div;
bool div_velocity_accelerating;
float last_time, delta_time;
clipboard_c* clipboard;
bool renderer_render;
DragState drag_state;
} LfState;
typedef enum {
INPUT_INT = 0,
INPUT_FLOAT,
INPUT_TEXT
} InputFieldType;
// Static object to retrieve state data during runtime
static LfState state;
// --- Renderer ---
static uint32_t shader_create(GLenum type, const char* src);
static LfShader shader_prg_create(const char* vert_src, const char* frag_src);
static void shader_set_mat(LfShader prg, const char* name, mat4 mat);
static void set_projection_matrix();
static void renderer_init();
static void renderer_flush();
static void renderer_begin();
static LfTextProps text_render_simple(vec2s pos, const char* text, LfFont font, LfColor font_color, bool no_render);
static LfTextProps text_render_simple_wide(vec2s pos, const wchar_t* text, LfFont font, LfColor font_color, bool no_render);
static LfClickableItemState button_ex(const char* file, int32_t line, vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color, vec2s hitbox_override);
static LfClickableItemState button(const char* file, int32_t line, vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color);
static LfClickableItemState div_container(vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color);
static void next_line_on_overflow(vec2s size, float xoffset);
static bool item_should_cull(LfAABB item);
static void draw_scrollbar_on(LfDiv* div);
static void input_field(LfInputField* input, InputFieldType type, const char* file, int32_t line);
LfFont load_font(const char* filepath, uint32_t pixelsize, uint32_t tex_width, uint32_t tex_height, uint32_t line_gap_add);
static LfFont get_current_font();
static LfClickableItemState button_element_loc(void* text, const char* file, int32_t line, bool wide);
static LfClickableItemState button_fixed_element_loc(void* text, float width, float height, const char* file, int32_t line, bool wide);
static LfClickableItemState checkbox_element_loc(void* text, bool* val, LfColor tick_color, LfColor tex_color, const char* file, int32_t line, bool wide);
static void dropdown_menu_item_loc(void** items, void* placeholder, uint32_t item_count, float width, float height, int32_t* selected_index, bool* opened, const char* file, int32_t line, bool wide);
static int32_t menu_item_list_item_loc(void** items, uint32_t item_count, int32_t selected_index, LfMenuItemCallback per_cb, bool vertical, const char* file, int32_t line, bool wide);
// --- Utility ---
static int32_t get_max_char_height_font(LfFont font);
static void remove_i_str(char *str, int32_t index);
static void remove_substr_str(char *str, int start_index, int end_index);
static void insert_i_str(char *str, char ch, int32_t index);
static void insert_str_str(char *source, const char *insert, int32_t index);
static void substr_str(const char* str, int start_index, int end_index, char* substring);
static int map_vals(int value, int from_min, int from_max, int to_min, int to_max);
// --- Input ---
#ifdef LF_GLFW
static void glfw_key_callback(GLFWwindow* window, int32_t key, int scancode, int action, int mods);
static void glfw_mouse_button_callback(GLFWwindow* window, int32_t button, int action, int mods);
static void glfw_scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
static void glfw_cursor_callback(GLFWwindow* window, double xpos, double ypos);
static void glfw_char_callback(GLFWwindow* window, uint32_t charcode);
#endif
static void update_input();
static void clear_events();
static uint64_t djb2_hash(uint64_t hash, const void* buf, size_t size);
static void props_stack_create(PropsStack* stack);
static void props_stack_resize(PropsStack* stack, uint32_t newcap);
static void props_stack_push(PropsStack* stack, LfUIElementProps props);
static LfUIElementProps props_stack_pop(PropsStack* stack);
static LfUIElementProps props_stack_peak(PropsStack* stack);
static bool props_stack_empty(PropsStack* stack);
static LfUIElementProps get_props_for(LfUIElementProps props);
// --- Static Functions ---
uint32_t shader_create(GLenum type, const char* src) {
// Create && compile the shader with opengl
uint32_t shader = glCreateShader(type);
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
// Check for compilation errors
int32_t compiled;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if(!compiled) {
LF_ERROR("Failed to compile %s shader.", type == GL_VERTEX_SHADER ? "vertex" : "fragment");
char info[512];
glGetShaderInfoLog(shader, 512, NULL, info);
LF_INFO("%s", info);
glDeleteShader(shader);
}
return shader;
}
LfShader shader_prg_create(const char* vert_src, const char* frag_src) {
// Creating vertex & fragment shader with the shader API
uint32_t vertex_shader = shader_create(GL_VERTEX_SHADER, vert_src);
uint32_t fragment_shader = shader_create(GL_FRAGMENT_SHADER, frag_src);
// Creating & linking the shader program with OpenGL
LfShader prg;
prg.id = glCreateProgram();
glAttachShader(prg.id, vertex_shader);
glAttachShader(prg.id, fragment_shader);
glLinkProgram(prg.id);
// Check for linking errors
int32_t linked;
glGetProgramiv(prg.id, GL_LINK_STATUS, &linked);
if(!linked) {
LF_ERROR("Failed to link shader program.");
char info[512];
glGetProgramInfoLog(prg.id, 512, NULL, info);
LF_INFO("%s", info);
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
glDeleteProgram(prg.id);
return prg;
}
// Delete the shaders after
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
return prg;
}
void shader_set_mat(LfShader prg, const char* name, mat4 mat) {
glUniformMatrix4fv(glGetUniformLocation(prg.id, name), 1, GL_FALSE, mat[0]);
}
void set_projection_matrix() {
float left = 0.0f;
float right = state.dsp_w;
float bottom = state.dsp_h;
float top = 0.0f;
float near = 0.1f;
float far = 100.0f;
// Create the orthographic projection matrix
mat4 orthoMatrix = GLM_MAT4_IDENTITY_INIT;
orthoMatrix[0][0] = 2.0f / (right - left);
orthoMatrix[1][1] = 2.0f / (top - bottom);
orthoMatrix[2][2] = -1;
orthoMatrix[3][0] = -(right + left) / (right - left);
orthoMatrix[3][1] = -(top + bottom) / (top - bottom);
shader_set_mat(state.render.shader, "u_proj", orthoMatrix);
}
void renderer_init() {
// OpenGL Setup
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
state.render.vert_count = 0;
state.render.verts = (Vertex*)malloc(sizeof(Vertex) * MAX_RENDER_BATCH * 4);
/* Creating vertex array & vertex buffer for the batch renderer */
glCreateVertexArrays(1, &state.render.vao);
glBindVertexArray(state.render.vao);
glCreateBuffers(1, &state.render.vbo);
glBindBuffer(GL_ARRAY_BUFFER, state.render.vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(Vertex) * MAX_RENDER_BATCH * 4, NULL,
GL_DYNAMIC_DRAW);
uint32_t* indices = (uint32_t*)malloc(sizeof(uint32_t) * MAX_RENDER_BATCH * 6);
uint32_t offset = 0;
for (uint32_t i = 0; i < MAX_RENDER_BATCH * 6; i += 6) {
indices[i + 0] = offset + 0;
indices[i + 1] = offset + 1;
indices[i + 2] = offset + 2;
indices[i + 3] = offset + 2;
indices[i + 4] = offset + 3;
indices[i + 5] = offset + 0;
offset += 4;
}
glCreateBuffers(1, &state.render.ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, state.render.ibo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, MAX_RENDER_BATCH * 6 * sizeof(uint32_t), indices, GL_STATIC_DRAW);
free(indices);
// Setting the vertex layout
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), NULL);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t)offsetof(Vertex, border_color));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t)offsetof(Vertex, border_width));
glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t)offsetof(Vertex, color));
glEnableVertexAttribArray(3);
glVertexAttribPointer(4, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, texcoord));
glEnableVertexAttribArray(4);
glVertexAttribPointer(5, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, tex_index));
glEnableVertexAttribArray(5);
glVertexAttribPointer(6, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, scale));
glEnableVertexAttribArray(6);
glVertexAttribPointer(7, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, pos_px));
glEnableVertexAttribArray(7);
glVertexAttribPointer(8, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, corner_radius));
glEnableVertexAttribArray(8);
glVertexAttribPointer(10, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, min_coord));
glEnableVertexAttribArray(10);
glVertexAttribPointer(11, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(intptr_t*)offsetof(Vertex, max_coord));
glEnableVertexAttribArray(11);
// Creating the shader for the batch renderer
const char* vert_src =
"#version 450 core\n"
"layout (location = 0) in vec2 a_pos;\n"
"layout (location = 1) in vec4 a_border_color;\n"
"layout (location = 2) in float a_border_width;\n"
"layout (location = 3) in vec4 a_color;\n"
"layout (location = 4) in vec2 a_texcoord;\n"
"layout (location = 5) in float a_tex_index;\n"
"layout (location = 6) in vec2 a_scale;\n"
"layout (location = 7) in vec2 a_pos_px;\n"
"layout (location = 8) in float a_corner_radius;\n"
"layout (location = 10) in vec2 a_min_coord;\n"
"layout (location = 11) in vec2 a_max_coord;\n"
"uniform mat4 u_proj;\n"
"out vec4 v_border_color;\n"
"out float v_border_width;\n"
"out vec4 v_color;\n"
"out vec2 v_texcoord;\n"
"out float v_tex_index;\n"
"flat out vec2 v_scale;\n"
"flat out vec2 v_pos_px;\n"
"flat out float v_is_gradient;\n"
"out float v_corner_radius;\n"
"out vec2 v_min_coord;\n"
"out vec2 v_max_coord;\n"
"void main() {\n"
"v_color = a_color;\n"
"v_texcoord = a_texcoord;\n"
"v_tex_index = a_tex_index;\n"
"v_border_color = a_border_color;\n"
"v_border_width = a_border_width;\n"
"v_scale = a_scale;\n"
"v_pos_px = a_pos_px;\n"
"v_corner_radius = a_corner_radius;\n"
"v_min_coord = a_min_coord;\n"
"v_max_coord = a_max_coord;\n"
"gl_Position = u_proj * vec4(a_pos.x, a_pos.y, 0.0f, 1.0);\n"
"}\n";
const char* frag_src = "#version 450 core\n"
"out vec4 o_color;\n"
"in vec4 v_color;\n"
"in float v_tex_index;\n"
"in vec4 v_border_color;\n"
"in float v_border_width;\n"
"in vec2 v_texcoord;\n"
"flat in vec2 v_scale;\n"
"flat in vec2 v_pos_px;\n"
"in float v_corner_radius;\n"
"uniform sampler2D u_textures[32];\n"
"uniform vec2 u_screen_size;\n"
"in vec2 v_min_coord;\n"
"in vec2 v_max_coord;\n"
"float rounded_box_sdf(vec2 center_pos, vec2 size, float radius) {\n"
" return length(max(abs(center_pos)-size+radius,0.0))-radius;\n"
"}\n"
"void main() {\n"
" if(u_screen_size.y - gl_FragCoord.y < v_min_coord.y && v_min_coord.y != -1) {\n"
" discard;\n"
" }\n"
" if(u_screen_size.y - gl_FragCoord.y > v_max_coord.y && v_max_coord.y != -1) {\n"
" discard;\n"
" }\n"
" if ((gl_FragCoord.x < v_min_coord.x && v_min_coord.x != -1) || (gl_FragCoord.x > v_max_coord.x && v_max_coord.x != -1)) {\n"
" discard;\n"
" }\n"
" vec2 size = v_scale;\n"
" vec4 opaque_color, display_color;\n"
" if(v_tex_index == -1) {\n"
" opaque_color = v_color;\n"
" } else {\n"
" opaque_color = texture(u_textures[int(v_tex_index)], v_texcoord) * v_color;\n"
" }\n"
" if(v_corner_radius != 0.0f) {"
" display_color = opaque_color;\n"
" vec2 location = vec2(v_pos_px.x, -v_pos_px.y);\n"
" location.y += u_screen_size.y - size.y;\n"
" float edge_softness = 1.0f;\n"
" float radius = v_corner_radius * 2.0f;\n"
" float distance = rounded_box_sdf(gl_FragCoord.xy - location - (size/2.0f), size / 2.0f, radius);\n"
" float smoothed_alpha = 1.0f-smoothstep(0.0f, edge_softness * 2.0f,distance);\n"
" vec3 fill_color;\n"
" if(v_border_width != 0.0f) {\n"
" vec2 location_border = vec2(location.x + v_border_width, location.y + v_border_width);\n"
" vec2 size_border = vec2(size.x - v_border_width * 2, size.y - v_border_width * 2);\n"
" float distance_border = rounded_box_sdf(gl_FragCoord.xy - location_border - (size_border / 2.0f), size_border / 2.0f, radius);\n"
" if(distance_border <= 0.0f) {\n"
" fill_color = display_color.xyz;\n"
" } else {\n"
" fill_color = v_border_color.xyz;\n"
" }\n"
" } else {\n"
" fill_color = display_color.xyz;\n"
" }\n"
" if(v_border_width != 0.0f)\n"
" o_color = mix(vec4(0.0f, 0.0f, 0.0f, 0.0f), vec4(fill_color, smoothed_alpha), smoothed_alpha);\n"
" else\n"
" o_color = mix(vec4(0.0f, 0.0f, 0.0f, 0.0f), vec4(fill_color, display_color.a), smoothed_alpha);\n"
" } else {\n"
" vec4 fill_color = opaque_color;\n"
" if(v_border_width != 0.0f) {\n"
" vec2 location = vec2(v_pos_px.x, -v_pos_px.y);\n"
" location.y += u_screen_size.y - size.y;\n"
" vec2 location_border = vec2(location.x + v_border_width, location.y + v_border_width);\n"
" vec2 size_border = vec2(v_scale.x - v_border_width * 2, v_scale.y - v_border_width * 2);\n"
" float distance_border = rounded_box_sdf(gl_FragCoord.xy - location_border - (size_border / 2.0f), size_border / 2.0f, v_corner_radius);\n"
" if(distance_border > 0.0f) {\n"
" fill_color = v_border_color;\n"
"}\n"
" }\n"
" o_color = fill_color;\n"
" }\n"
"}\n";
state.render.shader = shader_prg_create(vert_src, frag_src);
// initializing vertex position data
state.render.vert_pos[0] = (vec4s){-0.5f, -0.5f, 0.0f, 1.0f};
state.render.vert_pos[1] = (vec4s){0.5f, -0.5f, 0.0f, 1.0f};
state.render.vert_pos[2] = (vec4s){0.5f, 0.5f, 0.0f, 1.0f};
state.render.vert_pos[3] = (vec4s){-0.5f, 0.5f, 0.0f, 1.0f};
// Populating the textures array in the shader with texture ids
int32_t tex_slots[MAX_TEX_COUNT_BATCH];
for(uint32_t i = 0; i < MAX_TEX_COUNT_BATCH; i++)
tex_slots[i] = i;
glUseProgram(state.render.shader.id);
set_projection_matrix();
glUniform1iv(glGetUniformLocation(state.render.shader.id, "u_textures"), MAX_TEX_COUNT_BATCH, tex_slots);
}
void renderer_begin() {
state.render.vert_count = 0;
state.render.index_count = 0;
state.render.tex_index = 0;
state.render.tex_count = 0;
state.drawcalls = 0;
}
void renderer_flush() {
if(state.render.vert_count <= 0) return;
// Bind the vertex buffer & shader set the vertex data, bind the textures & draw
glUseProgram(state.render.shader.id);
glBindBuffer(GL_ARRAY_BUFFER, state.render.vbo);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(Vertex) * state.render.vert_count,
state.render.verts);
for(uint32_t i = 0; i < state.render.tex_count; i++) {
glBindTextureUnit(i, state.render.textures[i].id);
state.drawcalls++;
}
vec2s renderSize = (vec2s){(float)state.dsp_w, (float)state.dsp_h};
glUniform2fv(glGetUniformLocation(state.render.shader.id, "u_screen_size"), 1, (float*)renderSize.raw);
glBindVertexArray(state.render.vao);
glDrawElements(GL_TRIANGLES, state.render.index_count, GL_UNSIGNED_INT, NULL);
}
LfTextProps text_render_simple(vec2s pos, const char* text, LfFont font, LfColor font_color, bool no_render) {
return lf_text_render(pos, text, font, font_color, -1, (vec2s){-1, -1}, no_render, false, -1, -1);
}
LfTextProps text_render_simple_wide(vec2s pos, const wchar_t* text, LfFont font, LfColor font_color, bool no_render) {
return lf_text_render_wchar(pos, text, font, font_color, -1, (vec2s){-1, -1}, no_render, false, -1, -1);
}
LfClickableItemState button(const char* file, int32_t line, vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color) {
return button_ex(file, line, pos, size, props, color, border_width, click_color, hover_color, (vec2s){-1, -1});
}
LfClickableItemState button_ex(const char* file, int32_t line, vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color, vec2s hitbox_override) {
uint64_t id = DJB2_INIT;
id = djb2_hash(id, file, strlen(file));
id = djb2_hash(id, &line, sizeof(line));
if(state.element_id_stack != -1) {
id = djb2_hash(id, &state.element_id_stack, sizeof(state.element_id_stack));
}
if(item_should_cull((LfAABB){.pos = pos, .size= size})) {
return LF_IDLE;
}
LfColor hover_color_rgb = hover_color ? (props.hover_color.a == 0.0f ? lf_color_brightness(color, 1.2) : props.hover_color) : color;
LfColor held_color_rgb = click_color ? lf_color_brightness(color, 1.3) : color;
bool is_hovered = lf_hovered(pos, (vec2s){hitbox_override.x != -1 ? hitbox_override.x : size.x,
hitbox_override.y != -1 ? hitbox_override.y : size.y});
if(state.active_element_id == 0) {
if(is_hovered && lf_mouse_button_went_down(GLFW_MOUSE_BUTTON_LEFT)) {
state.active_element_id = id;
}
} else if(state.active_element_id == id) {
if(is_hovered && lf_mouse_button_is_released(GLFW_MOUSE_BUTTON_LEFT)) {
lf_rect_render(pos, size, hover_color_rgb, props.border_color, border_width, props.corner_radius);
state.active_element_id = 0;
return LF_CLICKED;
}
}
if(is_hovered && lf_mouse_button_is_released(GLFW_MOUSE_BUTTON_LEFT)) {
state.active_element_id = 0;
}
if(is_hovered && lf_mouse_button_is_down(GLFW_MOUSE_BUTTON_LEFT)) {
lf_rect_render(pos, size, held_color_rgb, props.border_color, border_width, props.corner_radius);
return LF_HELD;
}
if(is_hovered && (!lf_mouse_button_went_down(GLFW_MOUSE_BUTTON_LEFT) && !lf_mouse_button_is_down(GLFW_MOUSE_BUTTON_LEFT))) {
lf_rect_render(pos, size, hover_color ? hover_color_rgb : color, props.border_color, border_width, props.corner_radius);
return LF_HOVERED;
}
lf_rect_render(pos, size, color, props.border_color, border_width, props.corner_radius);
return LF_IDLE;
}
LfClickableItemState div_container(vec2s pos, vec2s size, LfUIElementProps props, LfColor color, float border_width, bool click_color, bool hover_color) {
if(item_should_cull((LfAABB){.pos = pos, .size = size})) {
return LF_IDLE;
}
LfColor hover_color_rgb = hover_color ? (props.hover_color.a == 0.0f ? lf_color_brightness(color, 1.5) : props.hover_color) : color;
LfColor held_color_rgb = click_color ? lf_color_brightness(color, 1.8) : color;
bool is_hovered = lf_hovered(pos, size);
if(is_hovered && lf_mouse_button_is_released(GLFW_MOUSE_BUTTON_LEFT)) {
lf_rect_render(pos, size, hover_color_rgb, props.border_color, border_width, props.corner_radius);
return LF_CLICKED;
}
if(is_hovered && lf_mouse_button_is_down(GLFW_MOUSE_BUTTON_LEFT)) {
lf_rect_render(pos, size, held_color_rgb, props.border_color, border_width, props.corner_radius);
return LF_HELD;
}
if(is_hovered && (!lf_mouse_button_went_down(GLFW_MOUSE_BUTTON_LEFT) && !lf_mouse_button_is_down(GLFW_MOUSE_BUTTON_LEFT))) {
lf_rect_render(pos, size, hover_color ? hover_color_rgb : color, props.border_color, border_width, props.corner_radius);
return LF_HOVERED;
}
lf_rect_render(pos, size, color, props.border_color, border_width, props.corner_radius);
return LF_IDLE;
}
void next_line_on_overflow(vec2s size, float xoffset) {
if(!state.line_overflow) return;
// If the object does not fit in the area of the current div, advance to the next line
if(state.pos_ptr.x - state.current_div.aabb.pos.x + size.x > state.current_div.aabb.size.x) {
state.pos_ptr.y += state.current_line_height;
state.pos_ptr.x = state.current_div.aabb.pos.x + xoffset;
state.current_line_height = 0;
}
if(size.y > state.current_line_height) {
state.current_line_height = size.y;
}
}
bool item_should_cull(LfAABB item) {
bool intersect = true;
LfAABB window = (LfAABB){.pos = (vec2s){0, 0}, .size = (vec2s){state.dsp_w, state.dsp_h}};
if(item.size.x == -1 || item.size.y == -1) {
item.size.x = state.dsp_w;
item.size.y = get_current_font().font_size;
}
if (item.pos.x + item.size.x <= window.pos.x || item.pos.x >= window.pos.x + window.size.x)
intersect = false;
if (item.pos.y + item.size.y <= window.pos.y || item.pos.y >= window.pos.y + window.size.y)
intersect = false;
return !intersect && state.current_div.id == state.scrollbar_div.id;
return false;
}
void draw_scrollbar_on(LfDiv* div) {
lf_next_line();
if (state.current_div.id == div->id) {
state.scrollbar_div = *div;
LfDiv* selected = div;
float scroll = *state.scroll_ptr;
LfUIElementProps props = get_props_for(state.theme.scrollbar_props);
selected->total_area.x = state.pos_ptr.x;
selected->total_area.y = state.pos_ptr.y + state.div_props.corner_radius;
if (*state.scroll_ptr < -((div->total_area.y - *state.scroll_ptr) - div->aabb.pos.y - div->aabb.size.y) && *state.scroll_velocity_ptr < 0 && state.theme.div_smooth_scroll) {
*state.scroll_velocity_ptr = 0;
*state.scroll_ptr = -((div->total_area.y - *state.scroll_ptr) - div->aabb.pos.y - div->aabb.size.y);
}
float total_area = selected->total_area.y - scroll;
float visible_area = selected->aabb.size.y + selected->aabb.pos.y;
if (total_area > visible_area) {
const float min_scrollbar_height = 20;
float area_mapped = visible_area / total_area;
float scroll_mapped = (-1 * scroll) / total_area;
float scrollbar_height = MAX((selected->aabb.size.y * area_mapped - props.margin_top * 2), min_scrollbar_height);
LfAABB scrollbar_area = (LfAABB){
.pos = (vec2s){
selected->aabb.pos.x + selected->aabb.size.x - state.theme.scrollbar_width - props.margin_right - state.div_props.padding - state.div_props.border_width,
MIN((selected->aabb.pos.y + selected->aabb.size.y * scroll_mapped + props.margin_top + state.div_props.padding + state.div_props.border_width + state.div_props.corner_radius),
visible_area - scrollbar_height)},
.size = (vec2s){
state.theme.scrollbar_width,
scrollbar_height - state.div_props.border_width * 2 - state.div_props.corner_radius * 2},
};
vec2s cursorpos = (vec2s){lf_get_mouse_x(), lf_get_mouse_y()};
if (lf_mouse_button_went_down(GLFW_MOUSE_BUTTON_LEFT) && lf_hovered(scrollbar_area.pos, scrollbar_area.size)) {
state.drag_state.is_dragging = true;
state.drag_state.start_cursor_pos = cursorpos;
state.drag_state.start_scroll = *state.scroll_ptr;
}
if(state.drag_state.is_dragging) {
float cursor_delta = (cursorpos.y - state.drag_state.start_cursor_pos.y);
float new_scroll = state.drag_state.start_scroll - cursor_delta * (total_area / visible_area);
*state.scroll_ptr = new_scroll;
if (*state.scroll_ptr > 0) {
*state.scroll_ptr = 0;
} else if (*state.scroll_ptr < -(total_area - visible_area)) {
*state.scroll_ptr = -(total_area - visible_area);
}
}
if (lf_mouse_button_is_released(GLFW_MOUSE_BUTTON_LEFT)) {
state.drag_state.is_dragging = false;
}
lf_rect_render(scrollbar_area.pos, scrollbar_area.size,
props.color, props.border_color, props.border_width, props.corner_radius);
}
}
}
void input_field(LfInputField* input, InputFieldType type, const char* file, int32_t line) {
if(!input->buf) return;
if(!input->_init) {
lf_input_field_unselect_all(input);
input->_init = true;
}
LfUIElementProps props = get_props_for(state.theme.inputfield_props);
LfFont font = get_current_font();
state.pos_ptr.x += props.margin_left;
state.pos_ptr.y += props.margin_top;
float wrap_point = state.pos_ptr.x + input->width - props.padding;
if(input->selected) {
if(lf_mouse_button_went_down(GLFW_MOUSE_BUTTON_LEFT) && (lf_get_mouse_x_delta() == 0 && lf_get_mouse_y_delta() == 0)) {
LfTextProps selected_props = lf_text_render((vec2s){
state.pos_ptr.x + props.padding,
state.pos_ptr.y + props.padding
}, input->buf, font, LF_NO_COLOR,
wrap_point, (vec2s){lf_get_mouse_x(), lf_get_mouse_y()}, true, false, -1, -1);
input->cursor_index = selected_props.rendered_count;
lf_input_field_unselect_all(input);
input->mouse_selection_end = input->cursor_index;
input->mouse_selection_start = input->cursor_index;
} else if(lf_mouse_button_is_down(GLFW_MOUSE_BUTTON_LEFT) && (lf_get_mouse_x_delta() != 0 || lf_get_mouse_y_delta() != 0)) {
if(input->mouse_dir == 0) {
input->mouse_dir = (lf_get_mouse_x_delta() < 0) ? -1 : 1;
input->mouse_selection_end = input->cursor_index;
input->mouse_selection_start = input->cursor_index;
}
LfTextProps selected_props = lf_text_render((vec2s){
state.pos_ptr.x + props.padding,
state.pos_ptr.y + props.padding
}, input->buf, font, LF_NO_COLOR, wrap_point, (vec2s){lf_get_mouse_x(), lf_get_mouse_y()}, true, false, -1, -1);
input->cursor_index = selected_props.rendered_count;
if(input->mouse_dir == -1)
input->mouse_selection_start = input->cursor_index;
else if(input->mouse_dir == 1)
input->mouse_selection_end = input->cursor_index;
input->selection_start = input->mouse_selection_start;
input->selection_end = input->mouse_selection_end;
if(input->mouse_selection_start == input->mouse_selection_end) {
input->mouse_dir = (lf_get_mouse_x_delta() < 0) ? -1 : 1;
}
} else if(lf_mouse_button_is_released(GLFW_MOUSE_BUTTON_LEFT)){
input->mouse_dir = 0;
}
if(lf_char_event().happened && lf_char_event().charcode >= 0 && lf_char_event().charcode <= 127 &&
strlen(input->buf) + 1 <= input->buf_size && (input->max_chars ? strlen(input->buf) + 1 <= input->max_chars : true)) {
if(input->insert_override_callback) {
input->insert_override_callback(input);
} else {
if(input->selection_start != -1) {
int start = input->selection_dir != 0 ? input->selection_start : input->selection_start - 1;
int end = input->selection_end;
remove_substr_str(input->buf, start, end);
input->cursor_index = input->selection_start;
lf_input_field_unselect_all(input);
}
lf_input_insert_char_idx(input, lf_char_event().charcode, input->cursor_index++);
}
}
if(lf_key_event().happened && lf_key_event().pressed) {
switch(lf_key_event().keycode) {
case GLFW_KEY_BACKSPACE: {
if(input->selection_start != -1) {
int start = input->selection_dir != 0 ? input->selection_start : input->selection_start - 1;
int end = input->selection_end;
remove_substr_str(input->buf, start, end);
input->cursor_index = input->selection_start;
lf_input_field_unselect_all(input);
}
else {
if(input->cursor_index - 1 < 0) break;
remove_i_str(input->buf, input->cursor_index - 1);
input->cursor_index--;
}
break;
}
case GLFW_KEY_LEFT: {
if(input->cursor_index - 1 < 0 ) {
if(!lf_key_is_down(GLFW_KEY_LEFT_SHIFT))
lf_input_field_unselect_all(input);
break;
}
if(lf_key_is_down(GLFW_KEY_LEFT_SHIFT)) {
if(input->selection_end == -1) {
input->selection_end = input->cursor_index - 1;
input->selection_dir = -1;
}
input->cursor_index--;
if(input->selection_dir == 1) {
if(input->cursor_index != input->selection_start) {
input->selection_end = input->cursor_index - 1;
} else {
lf_input_field_unselect_all(input);
}
} else {
input->selection_start = input->cursor_index;
}
} else {
if(input->selection_end == -1)
input->cursor_index--;
lf_input_field_unselect_all(input);
}
break;
}
case GLFW_KEY_RIGHT: {
if(input->cursor_index + 1 > strlen(input->buf)){
if(!lf_key_is_down(GLFW_KEY_LEFT_SHIFT))
lf_input_field_unselect_all(input);
break;
}
if(lf_key_is_down(GLFW_KEY_LEFT_SHIFT)) {
if(input->selection_start == -1) {
input->selection_start = input->cursor_index;
input->selection_dir = 1;
}
if(input->selection_dir == -1) {
input->cursor_index++;
if(input->cursor_index - 1 != input->selection_end) {
input->selection_start = input->cursor_index;
} else {
lf_input_field_unselect_all(input);
}
} else {
input->selection_end = input->cursor_index;
input->cursor_index++;
}
} else {
if(input->selection_end == -1)
input->cursor_index++;
lf_input_field_unselect_all(input);
}
break;
}
case GLFW_KEY_ENTER: {
// TODO: There is a bug with the input cursor when inserting new line characters
/*
insert_i_str(input->buf, '\n', input->cursor_index++);
*/
break;
}
case GLFW_KEY_TAB: {
if(strlen(input->buf) + 1 <= input->buf_size && (input->max_chars ? strlen(input->buf) + 1 <= input->max_chars : true)) {
for(uint32_t i = 0; i < 2; i++) {
insert_i_str(input->buf, ' ', input->cursor_index++);
}
}
break;
}
case GLFW_KEY_A: {
if(!lf_key_is_down(GLFW_KEY_LEFT_CONTROL)) break;
bool selected_all = input->selection_start == 0 && input->selection_end == strlen(input->buf);
if(selected_all) {
lf_input_field_unselect_all(input);
} else {
input->selection_start = 0;
input->selection_end = strlen(input->buf);
}
break;
}
case GLFW_KEY_C: {
if(!lf_key_is_down(GLFW_KEY_LEFT_CONTROL)) break;
char selection[strlen(input->buf)];
memset(selection, 0, strlen(input->buf));
substr_str(input->buf, input->selection_start, input->selection_end, selection);
clipboard_set_text(state.clipboard, selection);
break;
}
case GLFW_KEY_V: {
if(!lf_key_is_down(GLFW_KEY_LEFT_CONTROL)) break;
int32_t length;
const char* clipboard_content = clipboard_text_ex(state.clipboard, &length, LCB_CLIPBOARD);
if(strlen(input->buf) + length > input->buf_size || (input->max_chars ? strlen(input->buf) + length > input->max_chars : false)) break;
lf_input_insert_str_idx(input, clipboard_content, length, input->cursor_index);
input->cursor_index += strlen(clipboard_content);
break;
}
case GLFW_KEY_X: {
if (!lf_key_is_down(GLFW_KEY_LEFT_CONTROL)) break;
char selection[strlen(input->buf)];
memset(selection, 0, strlen(input->buf));
substr_str(input->buf, input->selection_start, input->selection_end, selection);
clipboard_set_text(state.clipboard, selection);
int start = input->selection_dir != 0 ? input->selection_start : input->selection_start - 1;
remove_substr_str(input->buf, start, input->selection_end);
input->cursor_index = input->selection_start;
lf_input_field_unselect_all(input);
break;
}
default: {
break;
}
}
}
if(input->key_callback) {
input->key_callback(input);
}
}
LfTextProps textprops = lf_text_render((vec2s){state.pos_ptr.x + props.padding, state.pos_ptr.y + props.padding}, input->buf,
font, LF_NO_COLOR,