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#include "text.h"
#include <cstddef>
#include "atlas.h"
#include "freetype/freetype.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);
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);
}
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