get all the commands to work

projects/apis/metal/src/texture/metal_texture.h

@@ -5,3 +5,7 @@
 typedef struct gnPlatformTexture_t {
     id<MTLTexture> texture;
 } gnPlatformTexture;
+
+gnReturnCode createMetalTexture(gnTexture texture, gnDevice device, const gnTextureInfo info);
+void metalTextureData(gnTextureHandle texture, void* pixelData);
+void metalDestroyTexture(gnTexture texture);

projects/apis/metal/src/texture/metal_texture.m

@@ -0,0 +1,33 @@
+#include "metal_texture.h"
+#include "surface/metal_surface.h"
+#include "devices/metal_output_devices.h"
+
+gnReturnCode createMetalTexture(gnTexture texture, gnDevice device, const gnTextureInfo info) {
+    texture->texture = malloc(sizeof(struct gnPlatformTexture_t));
+    MTLTextureDescriptor *textureDescriptor = [[MTLTextureDescriptor alloc] init];
+    textureDescriptor.pixelFormat = mtlGryphnFormatToMetalFormat(info.format);
+    textureDescriptor.width = info.width;
+    textureDescriptor.height = info.height;
+    texture->texture->texture = [device->outputDevice->device newTextureWithDescriptor:textureDescriptor];
+    [textureDescriptor release];
+    return GN_SUCCESS;
+}
+
+void metalTextureData(gnTextureHandle texture, void* pixelData) {
+    MTLRegion region = {
+        { 0, 0, 0 },
+        {texture->info.width, texture->info.height, 1}
+    };
+
+    NSUInteger bytesPerRow = 4 * texture->info.width; // TODO: fix this should not be set to 4
+    [texture->texture->texture replaceRegion:region
+                mipmapLevel:0
+                  withBytes:pixelData
+                bytesPerRow:bytesPerRow];
+
+}
+
+void metalDestroyTexture(gnTexture texture) {
+    [texture->texture->texture release];
+    free(texture->texture);
+}