From 7f7395f6a9429eb771fdc52742ee4d44ea0734ba Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Wed, 20 Jun 2018 20:36:40 -0400
Subject: add stub gpu_draw() method, enable writing to vram

---
 ops.yaml | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/ops.yaml b/ops.yaml
index 158b6df..0b6a42e 100644
--- a/ops.yaml
+++ b/ops.yaml
@@ -8319,8 +8319,8 @@ templates:
       case 0x8000:
       case 0x9000:
         // vram (8k)
-        // FIXME: can we write directly to vram?
-        // return ctx->mmu.vram[addr & 0x1FFF];
+        // (FIXME: can we write directly to vram?)
+        ctx->mmu.vram[addr & 0x1FFF] = val;
         break;
       case 0xA000:
       case 0xB000:
@@ -9383,6 +9383,14 @@ templates:
       }
     }
 
+    static void
+    gpu_draw(
+      gb_t * const ctx
+    ) {
+      UNUSED(ctx);
+      // TODO
+    }
+
     static void
     gpu_step(
       gb_t * const ctx,
@@ -9412,13 +9420,12 @@ templates:
         break;
       case GPU_MODE_HBLANK:
         if (ctx->gpu.clock > 204) {
-          // clear clock, increment line
+          // clear clock, draw line, increment line
           ctx->gpu.clock = 0;
+          gpu_draw(ctx);
           gpu_set_line(ctx, ctx->gpu.line + 1);
 
           if (ctx->gpu.line < 143) {
-            // TODO: process scanline
-
             // set mode
             gpu_set_mode(ctx, GPU_MODE_OAM);
           } else {
@@ -9437,7 +9444,6 @@ templates:
           ctx->gpu.clock = 0;
           gpu_set_line(ctx, ctx->gpu.line + 1);
 
-
           if (ctx->gpu.line > 153) {
             // reset clock, reset line, set mode
             ctx->gpu.clock = 0;
-- 
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