ui.c File Reference

#include "ui.h"
#include "glad/glad.h"
#include "io.h"
#include "log.h"
#include "render_utils.h"
#include "shader.h"
#include "utils.h"
#include <cglm/affine.h>
#include <cglm/cam.h>
#include <cglm/mat4.h>
#include <cglm/types.h>
#include <cglm/vec3.h>
#include <stb_truetype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

Include dependency graph for ui.c:

Data Structures
struct	UIQuad

Enumerations
enum	FontAtlasConfig { FONT_ATLAS_SIZE = 512 , FONT_FIRST_CHAR = 32 , FONT_CHAR_COUNT = 96 }
enum	VertexConfig { QUAD_VERTICES_COUNT = 6 , VERTEX_COMPONENTS = 12 , VERTICES_PER_QUAD = 6 , FLOATS_PER_VERTEX = 12 }

Functions
static void	setup_ui_render_state (void)
static int	create_font_atlas (unsigned char *font_buffer, float font_size, UIContext *ui_context)
static int	setup_vertex_buffers (UIContext *ui_context)
static void	prepare_batch (UIContext *ui_context, GLuint texture)
static UIQuad	make_glyph_quad (const GlyphInfo *glyph, float render_x, float render_y, float scale, const vec3 color, float alpha)
int	ui_init (UIContext *ui_context, const char *font_path, float font_size)
	Initializes the UI system. More...
void	ui_begin (UIContext *ui_context, int screen_width, int screen_height)
	Begins a new UI batch. More...
void	ui_flush (UIContext *ui_context)
	Flushes the current UI batch to the GPU. More...
void	ui_end (UIContext *ui_context)
	Ends the current UI batch and restores OpenGL state. More...
void	ui_draw_text (UIContext *ui_context, const char *text, float pos_x, float pos_y, const vec3 color, int screen_width, int screen_height)
	Draws a single text string at a specific coordinate. More...
float	ui_measure_text (const UIContext *ui_context, const char *text)
	Measures the width of a text string in pixels. More...
void	ui_draw_text_ex (UIContext *ui_context, const char *text, float pos_x, float pos_y, const vec3 color, float alpha, int screen_width, int screen_height)
	Draws text with custom alpha transparency. More...
void	ui_draw_text_scaled (UIContext *ui_context, const char *text, float pos_x, float pos_y, const vec3 color, float alpha, float scale, int screen_width, int screen_height)
	Draws text with custom alpha transparency and a scale factor. More...
void	ui_draw_rect (UIContext *ui_context, float rect_x, float rect_y, float width, float height, const vec3 color, int screen_width, int screen_height)
	Draws a solid color rectangle. More...
void	ui_draw_rect_ex (UIContext *ui_context, float rect_x, float rect_y, float width, float height, const vec3 color, float alpha, int screen_width, int screen_height)
	Draws a solid color rectangle with custom alpha transparency. More...
void	ui_destroy (UIContext *ui_context)
	Releases UI resources. More...
void	ui_layout_init (UILayout *layout, UIContext *ui_ctx, float pos_x, float pos_y, float padding, int screen_width, int screen_height)
	Initializes a layout helper for a frame. More...
void	ui_layout_text (UILayout *layout, const char *text, const vec3 color)
	Draws text and advances the layout cursor. More...
void	ui_layout_separator (UILayout *layout, float space)
	Adds vertical space to the layout. More...
void	ui_draw_spinner (UIContext *ui_context, float center_x, float center_y, float size, float angle, const vec3 color, int screen_width, int screen_height)
	Draws a rotating loading spinner. More...
void	ui_draw_rounded_rect (UIContext *ui_context, float rect_x, float rect_y, float width, float height, float radius, const vec3 color, float alpha, int screen_width, int screen_height)
	Draws a rounded rectangle with custom alpha. More...
void	ui_draw_textured_quad (UIContext *ui_context, GLuint texture, float rect_x, float rect_y, float width, float height, const vec3 tint, float alpha, int screen_width, int screen_height)
	Draws a textured quad tinted by a color (mode 3). More...
void	ui_draw_bloom_quad (UIContext *ui_context, GLuint texture, float rect_x, float rect_y, float width, float height, const vec3 tint, float intensity, int screen_width, int screen_height)
	Draws a textured quad with additive blending for bloom effects (mode 4). More...
void	ui_draw_glow_rect (UIContext *ui_context, float rect_x, float rect_y, float width, float height, float radius, const vec3 color, float alpha, int screen_width, int screen_height)
	Draws an SDF neon glow border around a rounded rectangle area. More...

Variables
static const float	FONT_ATLAS_SIZE_F = 512.0F
static const float	FONT_BASELINE_OFFSET = 30.0F
static const size_t	MAX_FONT_FILE_SIZE = 10 * 1024 * 1024
static const float	UI_QUAD_POS_HALF = 0.5F
static const float	UI_QUAD_TEX_MAX = 1.0F
static const float	UI_QUAD_MIN = 0.0F
static GLStateBackup	g_ui_saved_state

Enumeration Type Documentation

FontAtlasConfig

enum FontAtlasConfig

Enumerator
FONT_ATLAS_SIZE
FONT_FIRST_CHAR
FONT_CHAR_COUNT

VertexConfig

enum VertexConfig

Enumerator
QUAD_VERTICES_COUNT
VERTEX_COMPONENTS
VERTICES_PER_QUAD
FLOATS_PER_VERTEX

Function Documentation

create_font_atlas()

static int create_font_atlas ( unsigned char *  font_buffer, float  font_size, UIContext *  ui_context  )

static

make_glyph_quad()

static UIQuad make_glyph_quad ( const GlyphInfo *  glyph, float  render_x, float  render_y, float  scale, const vec3  color, float  alpha  )

static

prepare_batch()

static void prepare_batch ( UIContext *  ui_context, GLuint  texture  )

static

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setup_ui_render_state()

static void setup_ui_render_state ( void  )

static

setup_vertex_buffers()

static int setup_vertex_buffers ( UIContext *  ui_context )

static

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ui_begin()

void ui_begin	(	UIContext *	ui_context,
		int	screen_width,
		int	screen_height
	)

Begins a new UI batch.

Parameters

ui_context	Pointer to the UI context.
screen_width	Current window width.
screen_height	Current window height.

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ui_destroy()

void ui_destroy

(

UIContext *

ui_context

)

Releases UI resources.

Parameters

ui_context

Pointer to the struct.

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ui_draw_bloom_quad()

void ui_draw_bloom_quad	(	UIContext *	ui_context,
		GLuint	texture,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		const vec3	tint,
		float	intensity,
		int	screen_width,
		int	screen_height
	)

Draws a textured quad with additive blending for bloom effects (mode 4).

Uses GL_ONE, GL_ONE blending so dark pixels are invisible and bright pixels add light on top of existing content. The texture should be a radial bloom (bright center, black surround). The tint parameter allows coloring the bloom.

Parameters

texture	OpenGL texture handle (bloom PNG, black background).
tint	Color of the bloom light (e.g. white or cyan).
intensity	Bloom brightness (0.0 = invisible, 1.0 = full).

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ui_draw_glow_rect()

void ui_draw_glow_rect	(	UIContext *	ui_context,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		float	radius,
		const vec3	color,
		float	alpha,
		int	screen_width,
		int	screen_height
	)

Draws an SDF neon glow border around a rounded rectangle area.

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ui_draw_rect()

void ui_draw_rect	(	UIContext *	ui_context,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		const vec3	color,
		int	screen_width,
		int	screen_height
	)

Draws a solid color rectangle.

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ui_draw_rect_ex()

void ui_draw_rect_ex	(	UIContext *	ui_context,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		const vec3	color,
		float	alpha,
		int	screen_width,
		int	screen_height
	)

Draws a solid color rectangle with custom alpha transparency.

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ui_draw_rounded_rect()

void ui_draw_rounded_rect	(	UIContext *	ui_context,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		float	radius,
		const vec3	color,
		float	alpha,
		int	screen_width,
		int	screen_height
	)

Draws a rounded rectangle with custom alpha.

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ui_draw_spinner()

void ui_draw_spinner	(	UIContext *	ui_context,
		float	center_x,
		float	center_y,
		float	size,
		float	angle,
		const vec3	color,
		int	screen_width,
		int	screen_height
	)

Draws a rotating loading spinner.

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ui_draw_text()

void ui_draw_text	(	UIContext *	ui_context,
		const char *	text,
		float	pos_x,
		float	pos_y,
		const vec3	color,
		int	screen_width,
		int	screen_height
	)

Draws a single text string at a specific coordinate.

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ui_draw_text_ex()

void ui_draw_text_ex	(	UIContext *	ui_context,
		const char *	text,
		float	pos_x,
		float	pos_y,
		const vec3	color,
		float	alpha,
		int	screen_width,
		int	screen_height
	)

Draws text with custom alpha transparency.

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ui_draw_text_scaled()

void ui_draw_text_scaled	(	UIContext *	ui_context,
		const char *	text,
		float	pos_x,
		float	pos_y,
		const vec3	color,
		float	alpha,
		float	scale,
		int	screen_width,
		int	screen_height
	)

Draws text with custom alpha transparency and a scale factor.

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ui_draw_textured_quad()

void ui_draw_textured_quad	(	UIContext *	ui_context,
		GLuint	texture,
		float	rect_x,
		float	rect_y,
		float	width,
		float	height,
		const vec3	tint,
		float	alpha,
		int	screen_width,
		int	screen_height
	)

Draws a textured quad tinted by a color (mode 3).

The PNG texture's RGB is multiplied by the tint color, and its alpha channel is scaled by the alpha parameter. Use for keycaps and panel frame.

Note

Flushes the current batch if the active texture differs.

Parameters

texture	OpenGL texture handle (RGBA PNG).
tint	Tint color multiplied against the texture RGB.
alpha	Overall opacity.

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ui_end()

void ui_end

(

UIContext *

ui_context

)

Ends the current UI batch and restores OpenGL state.

Parameters

ui_context

Pointer to the UI context.

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ui_flush()

void ui_flush

(

UIContext *

ui_context

)

Flushes the current UI batch to the GPU.

Parameters

ui_context

Pointer to the UI context.

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ui_init()

int ui_init	(	UIContext *	ui_context,
		const char *	font_path,
		float	font_size
	)

Initializes the UI system.

Parameters

ui_context	Pointer to the struct.
font_path	Path to the binary font metrics/texture.
font_size	Default scale.

Returns

0 on success, non-zero on error.

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ui_layout_init()

void ui_layout_init	(	UILayout *	layout,
		UIContext *	ui_ctx,
		float	pos_x,
		float	pos_y,
		float	padding,
		int	screen_width,
		int	screen_height
	)

Initializes a layout helper for a frame.

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ui_layout_separator()

void ui_layout_separator	(	UILayout *	layout,
		float	space
	)

Adds vertical space to the layout.

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ui_layout_text()

void ui_layout_text	(	UILayout *	layout,
		const char *	text,
		const vec3	color
	)

Draws text and advances the layout cursor.

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ui_measure_text()

float ui_measure_text	(	const UIContext *	ui_context,
		const char *	text
	)

Measures the width of a text string in pixels.

Parameters

ui_context	Pointer to the context.
text	The text to measure.

Returns

Width in pixels.

Variable Documentation

FONT_ATLAS_SIZE_F

const float FONT_ATLAS_SIZE_F = 512.0F

static

FONT_BASELINE_OFFSET

const float FONT_BASELINE_OFFSET = 30.0F

static

g_ui_saved_state

GLStateBackup g_ui_saved_state

static

MAX_FONT_FILE_SIZE

const size_t MAX_FONT_FILE_SIZE = 10 * 1024 * 1024

static

UI_QUAD_MIN

const float UI_QUAD_MIN = 0.0F

static

UI_QUAD_POS_HALF

const float UI_QUAD_POS_HALF = 0.5F

static

UI_QUAD_TEX_MAX

const float UI_QUAD_TEX_MAX = 1.0F

static