From a806b420a64d44e8b9a0d6f0a742d7eaad06168a Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 6 May 2015 22:18:11 -0400
Subject: rasterizer: Implement combiner buffer input.

---
 src/video_core/pica.h | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

(limited to 'src/video_core/pica.h')

diff --git a/src/video_core/pica.h b/src/video_core/pica.h
index e4a91058c..30c8b7816 100644
--- a/src/video_core/pica.h
+++ b/src/video_core/pica.h
@@ -226,7 +226,8 @@ struct Regs {
             Texture1               = 0x4,
             Texture2               = 0x5,
             Texture3               = 0x6,
-            // 0x7-0xc = primary color??
+
+            PreviousBuffer         = 0xd,
             Constant               = 0xe,
             Previous               = 0xf,
         };
@@ -309,11 +310,36 @@ struct Regs {
     TevStageConfig tev_stage2;
     INSERT_PADDING_WORDS(0x3);
     TevStageConfig tev_stage3;
-    INSERT_PADDING_WORDS(0x13);
+    INSERT_PADDING_WORDS(0x3);
+
+    union {
+        // Tev stages 0-3 write their output to the combiner buffer if the corresponding bit in
+        // these masks are set
+        BitField< 8, 4, u32> update_mask_rgb;
+        BitField<12, 4, u32> update_mask_a;
+
+        bool TevStageUpdatesCombinerBufferColor(unsigned stage_index) const {
+            return (stage_index < 4) && (update_mask_rgb & (1 << stage_index));
+        }
+
+        bool TevStageUpdatesCombinerBufferAlpha(unsigned stage_index) const {
+            return (stage_index < 4) && (update_mask_a & (1 << stage_index));
+        }
+    } tev_combiner_buffer_input;
+    
+    INSERT_PADDING_WORDS(0xf);
     TevStageConfig tev_stage4;
     INSERT_PADDING_WORDS(0x3);
     TevStageConfig tev_stage5;
-    INSERT_PADDING_WORDS(0x3);
+
+    union {
+        BitField< 0, 8, u32> r;
+        BitField< 8, 8, u32> g;
+        BitField<16, 8, u32> b;
+        BitField<24, 8, u32> a;
+    } tev_combiner_buffer_color;
+
+    INSERT_PADDING_WORDS(0x2);
 
     const std::array<Regs::TevStageConfig,6> GetTevStages() const {
         return { tev_stage0, tev_stage1,
@@ -784,8 +810,10 @@ struct Regs {
         ADD_FIELD(tev_stage1);
         ADD_FIELD(tev_stage2);
         ADD_FIELD(tev_stage3);
+        ADD_FIELD(tev_combiner_buffer_input);
         ADD_FIELD(tev_stage4);
         ADD_FIELD(tev_stage5);
+        ADD_FIELD(tev_combiner_buffer_color);
         ADD_FIELD(output_merger);
         ADD_FIELD(framebuffer);
         ADD_FIELD(vertex_attributes);
@@ -859,8 +887,10 @@ ASSERT_REG_POSITION(tev_stage0, 0xc0);
 ASSERT_REG_POSITION(tev_stage1, 0xc8);
 ASSERT_REG_POSITION(tev_stage2, 0xd0);
 ASSERT_REG_POSITION(tev_stage3, 0xd8);
+ASSERT_REG_POSITION(tev_combiner_buffer_input, 0xe0);
 ASSERT_REG_POSITION(tev_stage4, 0xf0);
 ASSERT_REG_POSITION(tev_stage5, 0xf8);
+ASSERT_REG_POSITION(tev_combiner_buffer_color, 0xfd);
 ASSERT_REG_POSITION(output_merger, 0x100);
 ASSERT_REG_POSITION(framebuffer, 0x110);
 ASSERT_REG_POSITION(vertex_attributes, 0x200);
-- 
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