From c61a63c30f2c428097a7f34dd5104cccae05d3ab Mon Sep 17 00:00:00 2001
From: Dominic Masters <dominic@domsplace.com>
Date: Thu, 4 Nov 2021 13:28:28 -0700
Subject: [PATCH] Texture resizing

---
 CMakeLists.txt                     |  2 +-
 src/game/sandbox/game.c            |  2 +-
 tools/display/texture_generation.c | 82 +++++++++++++++++++-----------
 3 files changed, 54 insertions(+), 32 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9afa7f5..467ea14d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,7 +130,7 @@ elseif(TARGET_TYPE STREQUAL game)
       GAME_VERSION=1.0
     )
     tool_texture(test_texture
-      poker/characters/penny/sprites/sheet.png out/test.texture
+      poker/characters/penny/sprites/sheet.png out/penny
     )
     tool_assets(
       test_texture
diff --git a/src/game/sandbox/game.c b/src/game/sandbox/game.c
index ef8048a2..04e86818 100644
--- a/src/game/sandbox/game.c
+++ b/src/game/sandbox/game.c
@@ -22,7 +22,7 @@ bool sandboxGameInit(sandboxgame_t *game) {
   assetManagerStart(&game->manager);
 
   pixel_t *data = (pixel_t *)assetRawLoad("out/test.texture");
-  textureInit(&game->texture, 4360, 1920, (pixel_t *)data);
+  textureInit(&game->texture, 4360/2, 1920/2, (pixel_t *)data);
   free(data);
 
   return true;
diff --git a/tools/display/texture_generation.c b/tools/display/texture_generation.c
index 64691b1a..160e9ff1 100644
--- a/tools/display/texture_generation.c
+++ b/tools/display/texture_generation.c
@@ -7,11 +7,17 @@
 
 #pragma once
 #include "../utils/file.h"
-
 #ifndef  STB_IMAGE_IMPLEMENTATION
   #define STB_IMAGE_IMPLEMENTATION
   #include <stb_image.h>
 #endif
+#ifndef  STB_IMAGE_RESIZE_IMPLEMENTATION
+  #define STB_IMAGE_RESIZE_IMPLEMENTATION
+  #include <stb_image_resize.h>
+#endif
+
+#define RESIZE_VARIANT_COUNT 4
+int RESIZE_SCALES[RESIZE_VARIANT_COUNT] = { 1, 2, 3, 4 };
 
 int main(int argc, char *argv[]) {
   FILE *file;
@@ -19,14 +25,16 @@ int main(int argc, char *argv[]) {
   char *in;
   char *out;
   char pathSep;
-  int x, y, channels;
-  stbi_uc *data;
+  int w, h, channels, rw, rh, i, scale;
+  stbi_uc *dataOriginal;
+  stbi_uc *dataResized;
 
   if(argc != 3) {
     printf("Invalid number of arguments\n");
     return 1;
   }
 
+  // Set up strings
   pathSep = FILE_PATH_SEP;
   in = argv[1];
   out = argv[2];
@@ -36,45 +44,59 @@ int main(int argc, char *argv[]) {
   fileNormalizeSlashes(out);
 
   // Read in original texture
-  printf("Opening %s\n", in);
   file = fopen(in, "rb");
   if(file == NULL) {
     printf("Failed to open file!\n");
     return 1;
   }
-  data = stbi_load_from_file(file, &x, &y, &channels, STBI_rgb_alpha);
-  if(data == NULL) {
+
+  dataOriginal = stbi_load_from_file(file, &w, &h, &channels, STBI_rgb_alpha);
+  if(dataOriginal == NULL) {
     printf("Failed to load input texture!\n");
     return 1;
   }
+  fclose(file);
 
-  // Write out texture
-  path[0] = '\0';
-  if(getcwd(path,sizeof(path)) == NULL) {
-    printf("Failed to get current dir!\n");
-    stbi_image_free(data);
-    return 1;
+  // For each scale.
+  for(i = 0; i < RESIZE_VARIANT_COUNT; i++) {
+    // Resize image
+    scale = RESIZE_SCALES[i];
+    rw = w / scale;
+    rh = h / scale;
+    dataResized = malloc(sizeof(stbi_uc) * rw * rh * channels);
+    stbir_resize_uint8(dataOriginal, w, h, 0, dataResized, rw, rh, 0, channels);
+
+    // Determine output path
+    path[0] = '\0';
+    if(getcwd(path,sizeof(path)) == NULL) {
+      printf("Failed to get current dir!\n");
+      stbi_image_free(dataOriginal);
+      return 1;
+    }
+
+
+    // Determine Output path
+    sprintf(path, "%s%c%s_%i.texture", path, FILE_PATH_SEP, out, scale);
+    printf("Writing %s\n", path);
+
+    // Open output file
+    fileMkdirp(path);
+    file = fopen(path, "wb");
+    if(file == NULL) {
+      printf("Invalid file out!\n");
+      return 1;
+    }
+
+    // Write texture
+    fwrite(dataResized, sizeof(unsigned char), rw * rh * channels, file);
+
+    // Cleanup
+    fclose(file);
+    free(dataResized);
   }
 
-  // Determine Output path
-  strncat(path, &pathSep, 1);
-  strcat(path, out);
-  printf("Writing %s\n", path);
-
-  // Open output file
-  fileMkdirp(path);
-  file = fopen(path, "wb");
-  if(file == NULL) {
-    printf("Invalid file out!\n");
-    return 1;
-  }
-
-  // Write texture
-  fwrite(data, sizeof(unsigned char), x*y*channels, file);
-
   // Cleanup
-  fclose(file);
-  stbi_image_free(data);
+  stbi_image_free(dataOriginal);
 
   return 0;
 }
\ No newline at end of file