[WIP] Add text rendering

graphics/src/rse_text_renderer.c

@@ -0,0 +1,82 @@
+#include "rse_text_renderer.h"
+#include <stdint.h>
+#include <strings.h>
+
+#include "freetype/fttypes.h"
+#include "locale_fonts.h"
+#include "rse_font_errors.h"
+#include "utilities/logger.h"
+#include "utilities/rse_commons.h"
+#include "utilities/rse_errors_common.h"
+#include "rse_vulkan_image.h"
+
+#include "ft2build.h"
+#include "vulkan/vulkan_core.h"
+#include FT_FREETYPE_H
+
+#define FONT_CHARACTERS_COUNT 126
+
+uint16_t g_font_textures[FONT_CHARACTERS_COUNT];
+
+FT_Library g_library;
+rse_err_t rse_fonts_initialize()
+{
+    FT_Error error;
+
+    error = FT_Init_FreeType(&g_library);
+
+    if (error) {
+        LOGF(font_messages[FONT_INITIALIZATION_FAILED]);
+        return FONT_ERROR_INIT_FAILED;
+    }
+    return RSE_ERROR_NO_ERROR;
+}
+
+
+rse_err_t rse_fonts_load_from_file(const char* file_path)
+{
+    rse_err_t status = RSE_ERROR_NO_ERROR;
+    FT_Error error;
+    FT_Face face;
+    size_t iter = 0U;
+
+    error = FT_New_Face(g_library, file_path, 0, &face);
+
+    if (error) {
+        LOGF(font_messages[FONT_LOAD_FONT_FAILED]);
+        return FONT_ERROR_LOAD_FAILED;
+    }
+
+    /* By default we set font size to 16px. TODO: change later? */
+    error = FT_Set_Pixel_Sizes(face, 0, 48);
+
+    if (error) {
+        LOGF(font_messages[FONT_CHANGE_SIZE_FAILED]);
+        return FONT_ERROR_CHANGE_SIZE_FAILED;
+    }
+
+    /* Convert font face to textured image */
+    /* Loading only needed ascii characters, from 40 (space) to 126 (~) */
+    for (iter = 33U; iter < face->num_glyphs && iter < 127U; ++iter) {
+        error = FT_Load_Char(face, iter, FT_LOAD_RENDER);
+
+        if (error) {
+            LOGF(font_messages[FONT_LOAD_GLYPH_FAILED]);
+            return FONT_ERROR_LOAD_GLYPH_FAILED;
+        }
+
+        STATUS_CHECK(rse_load_texture_from_bitmat(face->glyph->bitmap.buffer,
+                                     face->glyph->bitmap.width,
+                                     face->glyph->bitmap.rows,
+                                     &g_font_textures[iter], VK_FORMAT_R8_UNORM));
+    }
+    return status;
+}
+
+rse_err_t rse_print_text(const char* text)
+{
+    rse_err_t status = RSE_ERROR_NO_ERROR;
+
+
+    return status;
+}