Add access to OEM attributes with macros

1 files changed, 38 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 2a445de..f3c07df 100644
--- a/src/main.c
+++ b/src/main.c
@@ -77,6 +77,22 @@ rgb15(u32 red, u32 green, u32 blue ) {
 #define COLOR_BLACK rgb15(0, 0, 0)
 #define COLOR_WHITE rgb15(28, 28, 28)
 
+//
+// Sprites.
+//
+
+// Using macros instead of aligned structs for setting up OAM attributes and
+// affine parameters.
+// TODO: Benchmark if this would be slower or the same that TONC's
+// implementation.
+#define OAM_ATTR_0(N)    *((vu16*)(MEM_OAM + 0 + 8 * (N)))
+#define OAM_ATTR_1(N)    *((vu16*)(MEM_OAM + 2 + 8 * (N)))
+#define OAM_ATTR_2(N)    *((vu16*)(MEM_OAM + 4 + 8 * (N)))
+#define OAM_AFFINE_PA(N) *((vs16*)(MEM_OAM + 6 + 8 * 0 + 8 * 4 * (N)))
+#define OAM_AFFINE_PB(N) *((vs16*)(MEM_OAM + 6 + 8 * 1 + 8 * 4 * (N)))
+#define OAM_AFFINE_PC(N) *((vs16*)(MEM_OAM + 6 + 8 * 2 + 8 * 4 * (N)))
+#define OAM_AFFINE_PD(N) *((vs16*)(MEM_OAM + 6 + 8 * 3 + 8 * 4 * (N)))
+
 // Using bd-font, an 8x8 bitmap font.
 static void
 put_char(int x, int y, Color clr, u8 chr) {
@@ -354,6 +370,28 @@ key_hold(u32 key) {
 int main(void) {
     DISP_CTRL = DISP_MODE_3 | DISP_BG_2;
 
+    // Test setting OAM parameters for sprite N with my custom macros.
+    OAM_ATTR_0(0) = 0xBADD;
+    OAM_ATTR_1(0) = 0x10DE;
+    OAM_ATTR_2(0) = 0xAC1D;
+    OAM_ATTR_0(1) = 0xFA7E;
+    OAM_ATTR_1(1) = 0xD15E;
+    OAM_ATTR_2(1) = 0xA5ED;
+    OAM_ATTR_0(2) = 0xBADD;
+    OAM_ATTR_1(2) = 0x10DE;
+    OAM_ATTR_2(2) = 0xAC1D;
+    OAM_ATTR_0(3) = 0xFA7E;
+    OAM_ATTR_1(3) = 0xD15E;
+    OAM_ATTR_2(3) = 0xA5ED;
+    OAM_AFFINE_PA(0) = 0x0011;
+    OAM_AFFINE_PB(0) = 0x2233;
+    OAM_AFFINE_PC(0) = 0x4455;
+    OAM_AFFINE_PD(0) = 0x6677;
+    OAM_AFFINE_PA(1) = 0xAABB;
+    OAM_AFFINE_PB(1) = 0xCCDD;
+    OAM_AFFINE_PC(1) = 0xEEFF;
+    OAM_AFFINE_PD(1) = 0x0101;
+
     draw_fill_rect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, COLOR_GREY);
 
     int side = 60;