Adding bitmap fonts

src/dawn/display/font/BitmapFont.cpp

@@ -0,0 +1,124 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#include "BitmapFont.hpp"
+
+using namespace Dawn;
+
+void BitmapFont::buffer(
+  std::string text,
+  float_t fontSize,
+  float_t maxWidth,
+  Mesh *mesh,
+  struct FontMeasure *info
+) {
+  assertNotNull(mesh);
+  assertNotNull(info);
+  assertTrue(maxWidth == -1 || maxWidth > 0);
+  assertTrue(this->isReady());
+  
+  // Initialize primitive
+  mesh->createBuffers(
+    QUAD_VERTICE_COUNT * text.size(),
+    QUAD_INDICE_COUNT * text.size()
+  );
+
+  // Setup Scales
+  info->length = 0;
+  info->realLength = 0;
+  info->lines.clear();
+  info->lineHeight = this->getLineHeight(fontSize);
+
+  // Prepare the line counters
+  info->addLine(0, 0);
+
+  // Reset Dimensions
+  char c;
+  Tile tile;
+  info->width = info->height = 0;
+  float_t x = 0;
+  float_t y = 0;
+  size_t i = 0;
+  size_t j = 0;
+  glm::vec2 xy0(0, 0);
+  glm::vec2 tileSize = glm::vec2(tileset->getTileWidth(), tileset->getTileHeight());
+
+  // Buffer quads
+  while(c = text[i++]) {
+    if(c == FONT_SPACE) {
+      
+      // Did this space cause a newline?
+      if(maxWidth != -1 && xy0.x > maxWidth) {
+        info->addLine(i, 0);
+        info->width = mathMax<float_t>(info->width, xy0.x);
+        xy0.x = 0;
+        xy0.y += tileSize.y;
+        info->height = mathMax<float_t>(info->height, xy0.y);
+        continue;
+      }
+
+      xy0.x += tileSize.x;
+      continue;
+    }
+    
+    if(c == FONT_NEWLINE) {
+      info->addLine(i, 0);
+      info->width = mathMax<float_t>(info->width, xy0.x);
+      xy0.x = 0;
+      xy0.y += tileSize.y;
+        info->height = mathMax<float_t>(info->height, xy0.y);
+      continue;
+    }
+
+    // Check for wrapping, todo.
+    if(maxWidth != -1 && (xy0.x+tileSize.x) > maxWidth) {
+      // We've exceeded the edge, go back to the start of the word and newline.
+
+      // Go back to the previous (still current) line and remove the chars
+
+      // Next line begins with this word
+    }
+
+    tile = this->tileset->getTile(c);
+    QuadMesh::bufferQuadMesh(mesh,
+      xy0, tile.uv0,
+      xy0+tileSize, tile.uv1,
+      j * QUAD_VERTICE_COUNT, j * QUAD_INDICE_COUNT
+    );
+    xy0.x += tileSize.x;//TODO: Spacing?
+    j++;
+  }
+
+  info->width = mathMax<float_t>(info->width, xy0.x);
+  info->height = mathMax<float_t>(info->height, xy0.y + (xy0.x > 0 ? tileSize.y : 0));
+}
+
+bool_t BitmapFont::isReady() {
+  if(this->texture == nullptr) return false;
+  if(this->tileset == nullptr) return false;
+  return this->texture->isReady();
+}
+
+Texture * BitmapFont::getTexture() {
+  return this->texture;
+}
+
+void BitmapFont::draw(Mesh *mesh, int32_t start, int32_t len) {
+  assertNotNull(mesh);
+
+  mesh->draw(
+    MESH_DRAW_MODE_TRIANGLES,
+    start * QUAD_INDICE_COUNT,
+    len == -1 ? len : len * QUAD_INDICE_COUNT
+  );
+}
+
+float_t BitmapFont::getLineHeight(float_t fontSize) {
+  return 16.0f;
+}
+
+float_t BitmapFont::getDefaultFontSize() {
+  return 16.0f;
+}

src/dawn/display/font/BitmapFont.hpp

@@ -0,0 +1,31 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "Font.hpp"
+#include "display/Tileset.hpp"
+
+namespace Dawn {
+  class BitmapFont : public Font {
+    protected:
+
+    public:
+      Texture *texture = nullptr;
+      TilesetGrid *tileset = nullptr;
+
+      void buffer(
+        std::string text,
+        float_t fontSize,
+        float_t maxWidth,
+        Mesh *mesh,
+        struct FontMeasure *info
+      ) override;
+      bool_t isReady() override;
+      Texture * getTexture()  override;
+      void draw(Mesh *mesh, int32_t startCharacter, int32_t length) override;
+      float_t getLineHeight(float_t fontSize) override;
+      float_t getDefaultFontSize() override;
+  };
+}

src/dawn/display/font/CMakeLists.txt

@@ -1,11 +1,12 @@
-# Copyright (c) 2022 Dominic Masters
-# 
-# This software is released under the MIT License.
-# https://opensource.org/licenses/MIT
-
-# Sources
-target_sources(${DAWN_TARGET_NAME}
-  PRIVATE
-    TrueTypeFont.cpp
-    FontMeasure.cpp
+# Copyright (c) 2022 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DAWN_TARGET_NAME}
+  PRIVATE
+    BitmapFont.cpp
+    TrueTypeFont.cpp
+    FontMeasure.cpp
 )