Display tweaks, add vbGetPixels()

core/vip.c

@@ -44,13 +44,26 @@ static void vipThrow(VB *sim, uint16_t cause) {
 
 /* Transfer one column of frame buffer pixels to output */
 static void vipTransferColumn(VB *sim, int32_t eye) {
-    int32_t bits; /* Pixel bits from frame buffer */
-    int     y, z; /* Iterators */
+    int32_t  bits; /* Pixel bits from frame buffer */
+    uint8_t *dest; /* Host frame image output */
+    uint8_t *src;  /* Simulation frame buffer input */
+    int      y, z; /* Iterators */
 
-    /* Select source and destination addresses in host memory */
-    uint8_t *dest = &sim->vip.frames
+    /* Select destination address in host memory */
+    dest = &sim->vip.frames
         [sim->vip.dp.buffer][eye][sim->vip.dp.column];
-    uint8_t *src  = &sim->vip.ram[
+
+    /* Output is disabled */
+    if ((sim->vip.dp.disp & sim->vip.dp.synce) == 0) {
+        for (z = 0; z < 0x15000; z += 4) {
+            busWriteBuffer(dest, VB_S32, 0);
+            dest += 4;
+        }
+        return;
+    }
+
+    /* Select source address in host memory */
+    src = &sim->vip.ram[
         eye                << 16 |
         sim->vip.dp.buffer << 15 |
         sim->vip.dp.column <<  6
@@ -363,9 +376,9 @@ static int vipOnFrame(VB *sim) {
 
 
 
-/***************************** Library Functions *****************************/
+/***************************** Display Processor *****************************/
 
-/* Display processor */
+/* Process sub-component */
 static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
 
     /* Process all clocks */
@@ -474,10 +487,24 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
     return 0;
 }
 
+
+
+/****************************** Pixel Processor ******************************/
+
+/* Process sub-component */
+static void vipEmulateDrawing(VB *sim, uint32_t clocks) {
+    (void) sim;
+    (void) clocks;
+}
+
+
+
+/***************************** Library Functions *****************************/
+
 /* Process component */
 static int vipEmulate(VB *sim, uint32_t clocks) {
     int brk = vipEmulateDisplay(sim, clocks);
-    /*vipEmulateDrawing(sim, clocks);*/
+    vipEmulateDrawing(sim, clocks);
     return brk;
 }