examples: Improve sprites example

examples/2d_system/sprites/graphics/assets.grit

@@ -0,0 +1,2 @@
+# 256 color palette
+-gx -gb -gB8 -gTFF00FF

examples/2d_system/sprites/graphics/assets.txt

@@ -0,0 +1,7 @@
+This file is derived from:
+
+Name:    Ancient ruins pixel art
+License: CC-BY 3.0
+Author:  CraftPix.net 2D Game Assets
+
+https://opengameart.org/content/ancient-ruins-pixel-art

examples/2d_system/sprites/source/main.c

@@ -6,12 +6,31 @@
 
 #include <NEMain.h>
 
+#include "assets.h"
 #include "icon.h"
 
-void Draw3DScene(void)
+NE_Sprite *Sprite[6];
+
+void Draw3DScene1(void)
 {
     NE_2DViewInit();
-    NE_SpriteDrawAll();
+
+    NE_ClearColorSet(NE_White, 31, 63);
+
+    NE_SpriteDraw(Sprite[3]);
+    NE_SpriteDraw(Sprite[4]);
+    NE_SpriteDraw(Sprite[5]);
+}
+
+void Draw3DScene2(void)
+{
+    NE_2DViewInit();
+
+    NE_ClearColorSet(NE_Gray, 31, 63);
+
+    NE_SpriteDraw(Sprite[0]);
+    NE_SpriteDraw(Sprite[1]);
+    NE_SpriteDraw(Sprite[2]);
 }
 
 int main(int argc, char *argv[])
@@ -20,51 +39,78 @@ int main(int argc, char *argv[])
     irqSet(IRQ_VBLANK, NE_VBLFunc);
     irqSet(IRQ_HBLANK, NE_HBLFunc);
 
-    NE_Init3D();
-    NE_SwapScreens();
+    NE_InitDual3D();
+    NE_InitConsole();
 
-    NE_Material *Material = NE_MaterialCreate();
-    NE_Palette *Palette = NE_PaletteCreate();
+    NE_Material *MaterialIcon = NE_MaterialCreate();
+    NE_Palette *PaletteIcon = NE_PaletteCreate();
 
-    NE_MaterialTexLoad(Material, NE_PAL16, 128, 128, NE_TEXGEN_TEXCOORD,
+    NE_MaterialTexLoad(MaterialIcon, NE_PAL16, 128, 128,
+                       NE_TEXGEN_TEXCOORD | NE_TEXTURE_COLOR0_TRANSPARENT,
                        iconBitmap);
-    NE_PaletteLoad(Palette, iconPal, 32, NE_PAL16);
-    NE_MaterialSetPalette(Material, Palette);
+    NE_PaletteLoad(PaletteIcon, iconPal, iconPalLen / 2, NE_PAL16);
+    NE_MaterialSetPalette(MaterialIcon, PaletteIcon);
 
+    NE_Material *MaterialAssets = NE_MaterialCreate();
+    NE_Palette *PaletteAssets = NE_PaletteCreate();
 
-    NE_ClearColorSet(NE_Gray, 31, 63);
+    NE_MaterialTexLoad(MaterialAssets, NE_PAL256, 512, 256,
+                       NE_TEXGEN_TEXCOORD | NE_TEXTURE_COLOR0_TRANSPARENT,
+                       assetsBitmap);
+    NE_PaletteLoad(PaletteAssets, assetsPal, assetsPalLen / 2, NE_PAL16);
+    NE_MaterialSetPalette(MaterialAssets, PaletteAssets);
 
-    NE_Sprite *Sprite[4];
     Sprite[0] = NE_SpriteCreate();
     Sprite[1] = NE_SpriteCreate();
     Sprite[2] = NE_SpriteCreate();
     Sprite[3] = NE_SpriteCreate();
+    Sprite[4] = NE_SpriteCreate();
+    Sprite[5] = NE_SpriteCreate();
 
-    NE_SpriteSetPos(Sprite[0], 0, 0);
-    NE_SpriteSetSize(Sprite[0], 128, 128);
+    // Sprite with the same size as the texture
+    NE_SpriteSetMaterial(Sprite[0], MaterialIcon);
+    NE_SpriteSetPos(Sprite[0], 10, 40);
     NE_SpriteSetPriority(Sprite[0], 10);
-    NE_SpriteSetMaterial(Sprite[0], Material);
 
+    // Sprite with a different size than the texture (scaled down) and a
+    // different color
+    NE_SpriteSetMaterial(Sprite[1], MaterialIcon);
     NE_SpriteSetPos(Sprite[1], 114, 32);
-    NE_SpriteSetSize(Sprite[1], 56, 56);
     NE_SpriteSetPriority(Sprite[1], 5);
     NE_SpriteSetParams(Sprite[1], 15, 1, NE_Green);
-    NE_SpriteSetMaterial(Sprite[1], Material);
+    NE_SpriteSetSize(Sprite[1], 56, 56);
 
+    // Sprite with a different size than the texture (scaled down), and with
+    // transparency.
+    NE_SpriteSetMaterial(Sprite[2], MaterialIcon);
     NE_SpriteSetPos(Sprite[2], 100, 50);
-    NE_SpriteSetSize(Sprite[2], 56, 56);
     NE_SpriteSetPriority(Sprite[2], 1);
-    NE_SpriteSetMaterial(Sprite[2], Material);
     NE_SpriteSetParams(Sprite[2], 15, 2, NE_White);
+    NE_SpriteSetSize(Sprite[2], 56, 56);
 
-    NE_SpriteSetPos(Sprite[3], 256 - 64, 192 - 64);
-    NE_SpriteSetSize(Sprite[3], 64, 64);
-    NE_SpriteSetPriority(Sprite[3], 12);
-    NE_SpriteSetMaterial(Sprite[3], Material);
+    // The following sprites will only use a small part of the texture
+
+    NE_SpriteSetMaterial(Sprite[3], MaterialAssets);
+    NE_SpriteSetPos(Sprite[3], 50, 60);
+    NE_SpriteSetMaterialCanvas(Sprite[3], 384, 0, 484, 118);
+    NE_SpriteSetSize(Sprite[3], 484 - 384, 118 - 0);
+
+    NE_SpriteSetMaterial(Sprite[4], MaterialAssets);
+    NE_SpriteSetPos(Sprite[4], 0, 0);
+    NE_SpriteSetMaterialCanvas(Sprite[4], 73, 0, 152, 75);
+    NE_SpriteSetSize(Sprite[4], 152 - 73, 75 - 0);
+
+    NE_SpriteSetMaterial(Sprite[5], MaterialAssets);
+    NE_SpriteSetPos(Sprite[5], 170, 20);
+    NE_SpriteSetMaterialCanvas(Sprite[5], 0, 77, 72, 175);
+    NE_SpriteSetSize(Sprite[5], 72 - 0, 175 - 77);
 
     int rot = 0;
     int x = 100, y = 50;
 
+    printf("PAD:   Move\n");
+    printf("START: Exit to loader\n");
+
     while (1)
     {
         NE_WaitForVBL(0);
@@ -84,9 +130,12 @@ int main(int argc, char *argv[])
         if (keys & KEY_LEFT)
             x--;
 
+        if (keys & KEY_START)
+            break;
+
         NE_SpriteSetPos(Sprite[2], x, y);
 
-        NE_Process(Draw3DScene);
+        NE_ProcessDual(Draw3DScene1, Draw3DScene2);
     }
 
     return 0;