[WIP] Add render text functionality

graphics/src/rse_text_renderer.c

@@ -17,15 +17,20 @@
 
 /* Load only ASCII characters that are needed. TODO: Add unicode characters */
 #define FONT_CHARACTERS_COUNT 94
+#define FONT_START_CHARACTER 33U
+
+#define FONT_SIZE 200
+/* Use this to scale font to 0.0 <-> 1.0 range */
+#define FONT_SCALING 1.0f/FONT_SIZE
 
 struct font_data_t {
     uint16_t mesh_id;
     uint16_t texture_id;
-    uint16_t width;
-    uint16_t height;
-    uint16_t bearing_x;
-    uint16_t bearing_y;
-    uint16_t advance;
+    float width;
+    float height;
+    float bearing_x;
+    float bearing_y;
+    int advance;
 };
 
 struct font_data_t g_fonts_data[FONT_CHARACTERS_COUNT];
@@ -53,7 +58,7 @@ rse_err_t rse_fonts_load_from_file(const char* file_path)
     FT_Face face;
     size_t iter = 0U;
     struct rse_vertex_t font_vertices[4];
-    const uint16_t font_indices[] = {0, 1, 2, 2, 3, 0};
+    uint16_t font_indices[] = {0, 1, 2, 2, 3, 0};
 
     error = FT_New_Face(g_library, file_path, 0, &face);
 
@@ -62,8 +67,8 @@ rse_err_t rse_fonts_load_from_file(const char* file_path)
         return FONT_ERROR_LOAD_FAILED;
     }
 
-    /* By default we set font size to 200px. TODO: change later? It looks OK though.. It looks OK though.... */
-    error = FT_Set_Pixel_Sizes(face, 0, 200);
+    /* By default we set font size to FONT_SIZE.*/
+    error = FT_Set_Pixel_Sizes(face, 0, FONT_SIZE);
 
     if (error) {
         LOGF(font_messages[FONT_CHANGE_SIZE_FAILED]);
@@ -73,7 +78,7 @@ rse_err_t rse_fonts_load_from_file(const char* file_path)
     /* Convert font face to textured image */
     /* Loading only needed ascii characters, from 40 (space) to 126 (~) */
     for (iter = 0U; iter < face->num_glyphs && iter < FONT_CHARACTERS_COUNT; ++iter) {
-        error = FT_Load_Char(face, iter + 33U, FT_LOAD_RENDER);
+        error = FT_Load_Char(face, iter + FONT_START_CHARACTER, FT_LOAD_RENDER);
 
         if (error) {
             LOGF(font_messages[FONT_LOAD_GLYPH_FAILED]);
@@ -86,16 +91,27 @@ rse_err_t rse_fonts_load_from_file(const char* file_path)
         g_fonts_data[iter].bearing_y = face->glyph->bitmap_top;
         g_fonts_data[iter].advance = face->glyph->advance.x;
 
+        LOGI("Width: %f, advance: %f", g_fonts_data[iter].width, g_fonts_data[iter].advance);
         font_vertices[0] = (struct rse_vertex_t) {
-            {0.0f, 0.0f, 0.0f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}
+            {g_fonts_data[iter].bearing_x, 0.0f, 0.0f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}
         };
         font_vertices[1] = (struct rse_vertex_t) {
-            {0.0f, 0.0f, 0.0f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}
+            {g_fonts_data[iter].bearing_x + g_fonts_data[iter].width, 0.0f, 0.0f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}
         };
+        font_vertices[2] = (struct rse_vertex_t) {
+            {g_fonts_data[iter].bearing_x + g_fonts_data[iter].width, g_fonts_data[iter].height, 0.0f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}
+        };
+        font_vertices[3] = (struct rse_vertex_t) {
+            {g_fonts_data[iter].bearing_x, g_fonts_data[iter].height, 0.0f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}
+        };
+
+        g_fonts_data[iter].mesh_id = create_mesh(font_vertices, font_indices, 8, 6);
+
         STATUS_CHECK(rse_load_texture_from_bitmat(face->glyph->bitmap.buffer,
                                      face->glyph->bitmap.width,
                                      face->glyph->bitmap.rows,
                                      &g_fonts_data[iter].texture_id, VK_FORMAT_R8_UNORM));
+
     }
     return status;
 }
@@ -103,7 +119,23 @@ rse_err_t rse_fonts_load_from_file(const char* file_path)
 rse_err_t rse_print_text(const char* text)
 {
     rse_err_t status = RSE_ERROR_NO_ERROR;
+    size_t iter = 0U;
+    size_t charactet_code = 0U;
+    float advance = 0.0f;
 
+    for (iter = 0U; iter < strlen(text); ++iter) {
+        charactet_code = (size_t)text[iter] - FONT_START_CHARACTER;
+
+        create_mesh_instance(g_fonts_data[charactet_code].mesh_id, (struct rse_instance_data_t){
+            {advance, 0.0f, 0.0f},
+            {0.0f, 0.0f, rse_math_deg_to_radians(0.0f)},
+            FONT_SCALING,
+            g_fonts_data[charactet_code].texture_id
+        });
+
+        advance += (g_fonts_data[charactet_code].advance >> 6) * FONT_SCALING;
+        LOGI("Advance: %f", advance);
+    }
 
     return status;
 }