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#include "text.h"
#include <cstddef>
#include <cstring>
#include "atlas.h"
#include "cglm/types.h"
#include "cglm/vec2.h"
#include "freetype/freetype.h"
#include "freetype/fttypes.h"
#include "hash.h"
#include "shaders.h"
#include "utils.h"
static void wayc_font_context_sampler_desc(struct sg_sampler_desc* desc) {
wayc_notnull(desc);
desc->min_filter = SG_FILTER_LINEAR;
desc->mag_filter = SG_FILTER_LINEAR;
desc->wrap_u = SG_WRAP_CLAMP_TO_EDGE;
desc->wrap_v = SG_WRAP_CLAMP_TO_EDGE;
}
static void wayc_font_context_layout(struct sg_vertex_layout_state* layout) {
wayc_notnull(layout);
layout->buffers[0].stride = sizeof(text_vertex_s);
layout->attrs[ATTR_text_in_position].format = SG_VERTEXFORMAT_FLOAT2;
layout->attrs[ATTR_text_in_position].buffer_index = 0;
layout->attrs[ATTR_text_in_position].offset = offsetof(text_vertex_s, pos);
layout->attrs[ATTR_text_in_uv].format = SG_VERTEXFORMAT_FLOAT2;
layout->attrs[ATTR_text_in_uv].buffer_index = 0;
layout->attrs[ATTR_text_in_uv].offset = offsetof(text_vertex_s, uv);
}
static void wayc_font_context_color(struct sg_color_target_state* color) {
wayc_notnull(color);
struct sg_blend_state blend = {};
blend.enabled = true;
blend.src_factor_rgb = SG_BLENDFACTOR_SRC_ALPHA;
blend.dst_factor_rgb = SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
blend.src_factor_alpha = SG_BLENDFACTOR_SRC_ALPHA;
blend.dst_factor_alpha = SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
color->blend = blend;
}
static void font_context_pipeline_desc(struct sg_pipeline_desc* desc,
struct sg_shader shader) {
wayc_notnull(desc);
struct sg_vertex_layout_state vertex_layout = {};
wayc_font_context_layout(&vertex_layout);
struct sg_color_target_state color = {};
wayc_font_context_color(&color);
desc->layout = vertex_layout;
desc->shader = shader;
desc->colors[0] = color;
desc->color_count = 1;
}
enum font_context_error_e wayc_font_context_init(
struct font_context_s* context) {
wayc_notnull(context);
memset(context, 0, sizeof(*context));
bool success = false;
FT_Library ft;
FT_Error fterr = FT_Init_FreeType(&ft);
if (fterr) return FONT_CONTEXT_ERROR_LOAD_LIBRARY;
wayc_defer_cond(FT_Done_FreeType(ft), success, true);
struct sg_shader shader =
sg_make_shader(text_shader_desc(sg_query_backend()));
if (sg_query_shader_state(shader) != SG_RESOURCESTATE_VALID)
return FONT_CONTEXT_ERROR_CREATE_SHADER;
wayc_defer_cond(sg_destroy_shader(shader), success, true);
struct sg_sampler_desc sampler_desc = {};
wayc_font_context_sampler_desc(&sampler_desc);
struct sg_pipeline_desc pipeline_desc = {};
font_context_pipeline_desc(&pipeline_desc, shader);
struct sg_sampler sampler = sg_make_sampler(&sampler_desc);
if (sg_query_sampler_state(sampler) != SG_RESOURCESTATE_VALID)
return FONT_CONTEXT_ERROR_CREATE_SAMPLER;
wayc_defer_cond(sg_destroy_sampler(sampler), success, true);
struct sg_pipeline pipeline = sg_make_pipeline(&pipeline_desc);
if (sg_query_pipeline_state(pipeline) != SG_RESOURCESTATE_VALID)
return FONT_CONTEXT_ERROR_CREATE_PIPELINE;
context->ft = ft;
context->sampler = sampler;
context->pipeline = pipeline;
success = true;
return FONT_CONTEXT_ERROR_NONE;
}
void wayc_font_context_deinit(struct font_context_s* context) {
wayc_notnull(context);
sg_destroy_pipeline(context->pipeline);
sg_destroy_sampler(context->sampler);
FT_Done_FreeType(context->ft);
}
enum font_error_e wayc_font_init(struct font_s* font,
struct font_context_s* context,
const char* path, u32 font_size,
u32 atlas_width, u32 atlas_height) {
wayc_notnull(font);
wayc_notnull(context);
memset(font, 0, sizeof(*font));
bool success = false;
FT_Face face;
FT_Error fterr = FT_New_Face(context->ft, path, 0, &face);
if (fterr) return FONT_ERROR_LOAD_FACE;
wayc_defer_cond(FT_Done_Face(face), success, true);
fterr = FT_Set_Pixel_Sizes(face, 0, font_size);
if (fterr) return FONT_ERROR_LOAD_FACE;
struct atlas_s atlas;
enum atlas_error_e aterr =
wayc_atlas_init(&atlas, atlas_width, atlas_height, SG_PIXELFORMAT_R8);
if (aterr) return FONT_ERROR_ATLAS_FAILED;
font->context = context;
font->face = face;
font->atlas = atlas;
wayc_hashmap_init(&font->cached);
success = true;
return FONT_ERROR_NONE;
}
enum font_error_e wayc_font_raster(struct font_s* font, codepoint_t codepoint,
struct glyph_s* glyph) {
wayc_notnull(font);
wayc_notnull(glyph);
struct glyph_s got;
if (wayc_hashmap_get(&font->cached, &codepoint, &got)) {
*glyph = got;
return FONT_ERROR_NONE;
}
u32 index = FT_Get_Char_Index(font->face, codepoint);
if (index == 0) return FONT_ERROR_LOAD_GLYPH;
FT_Error fterr = FT_Load_Glyph(font->face, index, FT_LOAD_RENDER);
if (fterr) return FONT_ERROR_LOAD_GLYPH;
FT_GlyphSlot slot = font->face->glyph;
FT_Bitmap bitmap = slot->bitmap;
vec2 uv0, uv1;
enum atlas_error_e aterr = wayc_atlas_insert(
&font->atlas, bitmap.width, bitmap.rows, bitmap.buffer, &uv0, &uv1);
if (aterr) return FONT_ERROR_ATLAS_FAILED;
vec2 bearing = {(f32)slot->bitmap_left, (f32)slot->bitmap_top};
f32 advance = (f32)slot->advance.x / WAYC_SCALE;
glm_vec2_copy(uv0, got.uv0);
glm_vec2_copy(uv1, got.uv1);
glm_vec2_copy(bearing, got.bearing);
got.advance = advance;
wayc_hashmap_insert(&font->cached, &codepoint, &got);
*glyph = got;
return FONT_ERROR_NONE;
}
enum font_error_e wayc_font_raster(struct font_s* font, const char* text,
usize text_len, struct glyph_s* glyphs,
usize max_glyphs) {
wayc_notnull(font);
wayc_notnull(text);
wayc_notnull(glyphs);
memset(glyphs, 0, sizeof(*glyphs) * max_glyphs);
usize count = 0;
for (usize i = 0; i < text_len && count < max_glyphs; i++) {
codepoint_t codepoint = (codepoint_t)text[i]; // TODO: handle UTF-8
struct glyph_s glyph;
enum font_error_e err = wayc_font_raster(font, codepoint, &glyph);
if (err) return err;
glyphs[count++] = glyph;
}
return FONT_ERROR_NONE;
}
enum font_error_e wayc_font_raster_text(struct font_s* font, const char* text,
usize text_len, struct glyph_s* glyphs,
usize max_glyphs) {
wayc_notnull(font);
wayc_notnull(text);
wayc_notnull(glyphs);
memset(glyphs, 0, sizeof(*glyphs) * max_glyphs);
usize count = 0;
for (usize i = 0; i < text_len && count < max_glyphs; i++) {
codepoint_t codepoint = (codepoint_t)text[i]; // TODO: handle utf-8
struct glyph_s glyph;
enum font_error_e err = wayc_font_raster(font, codepoint, &glyph);
if (err != FONT_ERROR_NONE) return err;
glyphs[count++] = glyph;
}
return FONT_ERROR_NONE;
}
void wayc_font_deinit(struct font_s* font) {
wayc_notnull(font);
wayc_hashmap_deinit(&font->cached);
wayc_atlas_deinit(&font->atlas);
FT_Done_Face(font->face);
}
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