From 788f5e89c29daab31f1099f081ca92d72e507bf1 Mon Sep 17 00:00:00 2001
From: Justin Weiss
Date: Thu, 27 Feb 2020 23:42:43 -0800
Subject: WIP: Add ARM-assembly versions of lighting and blending

---
 plugins/gpu_unai/gpu_inner_light_arm.h | 79 ++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 plugins/gpu_unai/gpu_inner_light_arm.h

(limited to 'plugins/gpu_unai/gpu_inner_light_arm.h')

diff --git a/plugins/gpu_unai/gpu_inner_light_arm.h b/plugins/gpu_unai/gpu_inner_light_arm.h
new file mode 100644
index 0000000..ac99cf3
--- /dev/null
+++ b/plugins/gpu_unai/gpu_inner_light_arm.h
@@ -0,0 +1,79 @@
+#ifndef _OP_LIGHT_ARM_H_
+#define _OP_LIGHT_ARM_H_
+
+////////////////////////////////////////////////////////////////////////////////
+// Extract bgr555 color from Gouraud u32 fixed-pt 8.3:8.3:8.2 rgb triplet
+//
+// INPUT:
+//  'gCol' input:  rrrrrrrrXXXggggggggXXXbbbbbbbbXX
+//                 ^ bit 31
+// RETURNS:
+//    u16 output:  0bbbbbgggggrrrrr
+//                 ^ bit 16
+// Where 'r,g,b' are integer bits of colors, 'X' fixed-pt, and '0' zero
+////////////////////////////////////////////////////////////////////////////////
+GPU_INLINE u16 gpuLightingRGBARM(u32 gCol)
+{
+  u16 out = 0x03E0; // don't need the mask after starting to write output
+  u32 tmp;
+  
+  asm ("and %[tmp], %[gCol], %[out]\n\t"              // tmp holds 0x000000bbbbb00000
+       "and %[out], %[out],  %[gCol], lsr #0x0B\n\t"  // out holds 0x000000ggggg00000
+       "orr %[tmp], %[out],  %[tmp],  lsl #0x05\n\t"  // tmp holds 0x0bbbbbggggg00000
+       "orr %[out], %[tmp],  %[gCol], lsr #0x1B\n\t"  // out holds 0x0bbbbbgggggrrrrr
+       : [out] "+&r" (out), [tmp] "=&r" (tmp)
+       : [gCol] "r"  (gCol)
+  );
+
+  return out;
+}
+
+
+GPU_INLINE u16 gpuLightingTXTARM(u16 uSrc, u8 r5, u8 g5, u8 b5)
+{
+  u16 out = 0x03E0;
+  u32 db, dg;
+  asm ("and    %[dg],  %[out],  %[src]  \n\t"
+       "orr    %[dg],  %[dg],   %[g5]   \n\t"
+       "and    %[db],  %[out],  %[src], lsr #0x05 \n\t"
+       "ldrb   %[dg],  [%[lut], %[dg]]  \n\t" 
+       "and    %[out], %[out],  %[src], lsl #0x05 \n\t"
+       "orr    %[out], %[out],  %[r5]   \n\t"
+       "orr    %[db],  %[db],   %[b5]   \n\t"
+       "ldrb   %[out], [%[lut], %[out]] \n\t"
+       "ldrb   %[db],  [%[lut], %[db]]  \n\t"
+       "orr    %[out], %[out],  %[dg],  lsl #0x05   \n\t"
+       "orr    %[out], %[out],  %[db],  lsl #0x0A   \n\t"
+    : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg)
+    : [r5] "r" (r5), [g5] "r" (g5),  [b5] "r" (b5),
+      [lut] "r" (gpu_unai.LightLUT), [src] "r" (uSrc), "0" (out)
+    : "cc");
+  return out;
+}
+
+GPU_INLINE u16 gpuLightingTXTGouraudARM(u16 uSrc, u32 gCol)
+{
+  u16 out = 0x03E0; // don't need the mask after starting to write output
+  u32 db,dg,gtmp;
+  asm ("and    %[dg],  %[out],  %[src]   \n\t"
+       "and    %[gtmp],%[out],  %[gCol], lsr #0x0B \n\t"
+       "and    %[db],  %[out],  %[src],  lsr #0x05 \n\t"
+       "orr    %[dg],  %[dg],   %[gtmp], lsr #0x05 \n\t"
+       "and    %[gtmp],%[out],  %[gCol]  \n\t"
+       "ldrb   %[dg],  [%[lut], %[dg]]   \n\t"
+       "and    %[out], %[out],  %[src],  lsl #0x05 \n\t"
+       "orr    %[out], %[out],  %[gCol], lsr #0x1B \n\t"
+       "orr    %[db],  %[db],   %[gtmp], lsr #0x05 \n\t"
+       "ldrb   %[out], [%[lut], %[out]]  \n\t"
+       "ldrb   %[db],  [%[lut], %[db]]   \n\t"
+       "orr    %[out], %[out],  %[dg],   lsl #0x05 \n\t"
+       "orr    %[out], %[out],  %[db],   lsl #0x0A \n\t"
+       : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg),
+         [gtmp] "=&r" (gtmp) \
+       : [gCol] "r" (gCol), [lut] "r" (gpu_unai.LightLUT), "0" (out), [src] "r" (uSrc)
+       : "cc");
+
+  return out;
+}
+
+#endif  //_OP_LIGHT_ARM_H_
-- 
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