archivemuh

archive/dusksdl2/display/ui/rendertext.c

@@ -0,0 +1,159 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "rendertext.h"
+#include "display/render.h"
+#include "assert/assert.h"
+#include "display/spritebatch/spritebatch.h"
+#include "util/memory.h"
+#include "util/math.h"
+
+texture_t RENDER_TEXT_TEXTURE;
+
+static mesh_t RENDER_TEXT_QUAD_MESH;
+
+void renderTextInit(void) {
+  const int32_t cols = FONT_COLUMN_COUNT;
+  const int32_t rows = (FONT_TILE_COUNT + cols - 1) / cols;
+  const int32_t inputFontWidth  = cols * FONT_TILE_WIDTH;
+  const int32_t inputFontHeight = rows * FONT_TILE_HEIGHT;
+
+  int32_t outputFontWidth = inputFontWidth;
+  int32_t outputFontHeight = inputFontHeight;
+
+  // Round up to nearest power of 2
+  #if PSP
+    outputFontWidth = mathNextPowTwo(inputFontWidth);
+    outputFontHeight = mathNextPowTwo(inputFontHeight);
+  #endif
+
+  uint8_t *pixels = (uint8_t *)memoryAllocate(
+    outputFontWidth * outputFontHeight *
+    sizeof(uint8_t)
+  );
+
+  // Buffer the pixels.
+  for(int tileIndex = 0; tileIndex < FONT_TILE_COUNT; ++tileIndex) {
+    const int32_t tileX = (tileIndex % FONT_COLUMN_COUNT) * FONT_TILE_WIDTH;
+    const int32_t tileY = (tileIndex / FONT_COLUMN_COUNT) * FONT_TILE_HEIGHT;
+    const uint8_t* tile = TILE_PIXEL_DATA[tileIndex];
+
+    for (int y = 0; y < FONT_TILE_HEIGHT; ++y) {
+      for (int x = 0; x < FONT_TILE_WIDTH; ++x) {
+        const int32_t pixel = (tileY + y) * outputFontWidth + (tileX + x);
+        const int32_t pixelOffset = pixel;
+        uint8_t value = tile[y * FONT_TILE_WIDTH + x];
+        pixels[pixel] = value ? 0xFF : 0x00; // Alpha channel
+      }
+    }
+  }
+
+  textureInit(
+    &RENDER_TEXT_TEXTURE,
+    outputFontWidth, outputFontHeight,
+    GL_ALPHA, pixels
+  );
+  memoryFree(pixels);
+}
+
+void renderTextDrawChar(
+  const float_t x,
+  const float_t y,
+  const char_t c,
+  const uint8_t r,
+  const uint8_t g,
+  const uint8_t b
+) {
+  int32_t tileIndex = (int32_t)(c) - FONT_CHAR_START;
+  assertTrue(
+    tileIndex >= 0 && tileIndex < FONT_TILE_COUNT, 
+    "Character is out of bounds for font tiles"
+  );
+
+  const float_t w = (float)RENDER_TEXT_TEXTURE.width;
+  const float_t h = (float)RENDER_TEXT_TEXTURE.height;
+  const int32_t tileX = (tileIndex % FONT_COLUMN_COUNT);
+  const int32_t tileY = (tileIndex / FONT_COLUMN_COUNT);
+
+  spriteBatchPush(
+    &RENDER_TEXT_TEXTURE,
+    x, y,
+    x + FONT_TILE_WIDTH, y + FONT_TILE_HEIGHT,
+    r, g, b, 0xFF,
+    (tileX * FONT_TILE_WIDTH) / w,
+    (tileY * FONT_TILE_HEIGHT) / h,
+    ((tileX + 1) * FONT_TILE_WIDTH) / w,
+    ((tileY + 1) * FONT_TILE_HEIGHT) / h
+  );
+}
+
+void renderTextDraw(
+  const float_t x,
+  const float_t y,
+  const char_t *text,
+  const uint8_t r,
+  const uint8_t g,
+  const uint8_t b
+) {
+  assertNotNull(text, "Text cannot be NULL");
+
+  float_t posX = x;
+  float_t posY = y;
+
+  char_t c;
+  int32_t i = 0;
+  while((c = text[i++]) != '\0') {
+    if(c == '\n') {
+      posX = x;
+      posY += FONT_TILE_HEIGHT;
+      continue;
+    }
+
+    renderTextDrawChar(posX, posY, c, r, g, b);
+    posX += FONT_TILE_WIDTH;
+  }
+}
+
+void renderTextMeasure(
+  const char_t *text,
+  int32_t *outWidth,
+  int32_t *outHeight
+) {
+  assertNotNull(text, "Text cannot be NULL");
+  assertNotNull(outWidth, "Output width pointer cannot be NULL");
+  assertNotNull(outHeight, "Output height pointer cannot be NULL");
+
+  int32_t width = 0;
+  int32_t height = FONT_TILE_HEIGHT;
+  int32_t lineWidth = 0;
+
+  char_t c;
+  int32_t i = 0;
+  while((c = text[i++]) != '\0') {
+    if(c == '\n') {
+      if(lineWidth > width) {
+        width = lineWidth;
+      }
+      lineWidth = 0;
+      height += FONT_TILE_HEIGHT;
+      continue;
+    }
+
+    lineWidth += FONT_TILE_WIDTH;
+  }
+
+  if(lineWidth > width) {
+    width = lineWidth;
+  }
+
+  *outWidth = width;
+  *outHeight = height;
+}
+
+void renderTextDispose(void) {
+  textureDispose(&RENDER_TEXT_TEXTURE);
+}