channel formats python script

engine/src/model.cpp

@@ -138,21 +138,29 @@ bool Model::loadTexture() {
 
   // Determine the correct format
   GLenum format;
-  if (num_channels == 1)
-    format = GL_RED;
-  else if (num_channels == 3)
-    format = GL_RGB;
-  else if (num_channels == 4)
-    format = GL_RGBA;
-  else {
-    std::cerr << "Unsupported number of channels: " << num_channels
-              << std::endl;
-    stbi_image_free(image_data);
-    return false;
+  switch (num_channels) {
+    case 1:
+      format = GL_RED;
+      break;
+    case 3:
+      format = GL_RGB;
+      break;
+    case 4:
+      format = GL_RGBA;
+      break;
+    default: {
+      // Free image data before returning
+      stbi_image_free(image_data);
+      std::cerr << "Unsupported number of channels: " << num_channels
+                << std::endl;
+      return false;
+    }
   }
 
+  std::cout << "Format is: " << format << " (" << num_channels << ")"  << std::endl;
+
   // Upload data to GPU
-  glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format,
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
                GL_UNSIGNED_BYTE, image_data);
   glGenerateMipmap(GL_TEXTURE_2D);
 

scripts/channels_formats.py

@@ -0,0 +1,40 @@
+from PIL import Image
+import sys
+
+def check_image_format(image_path):
+    try:
+        with Image.open(image_path) as img:
+            mode = img.mode
+            format = img.format
+            size = img.size
+
+            if mode == "L":
+                num_channels = 1  # Grayscale
+                opengl_format = "GL_RED"
+            elif mode == "LA":
+                num_channels = 2  # Grayscale + Alpha
+                opengl_format = "GL_RG"
+            elif mode == "RGB":
+                num_channels = 3  # RGB
+                opengl_format = "GL_RGB"
+            elif mode == "RGBA":
+                num_channels = 4  # RGBA
+                opengl_format = "GL_RGBA"
+            else:
+                num_channels = len(mode)  # Other modes like "CMYK"
+                opengl_format = "Unknown or not directly supported"
+
+            print(f"Image Format: {format}")
+            print(f"Image Size: {size}")
+            print(f"Number of Channels: {num_channels}")
+            print(f"OpenGL Format: {opengl_format}")
+
+    except IOError:
+        print(f"Cannot open image file: {image_path}")
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("Usage: python check_image_format.py <image_path>")
+    else:
+        image_path = sys.argv[1]
+        check_image_format(image_path)