sh: sm501: Add hardware cursor feature
This patch adds hardware cursor feature to SM501 graphics chip emulation,
to make the graphic console more useful for QEMU SH4 users.
Signed-off-by: Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/hw/sm501_template.h b/hw/sm501_template.h
index 1679df7..d1ceef9 100644
--- a/hw/sm501_template.h
+++ b/hw/sm501_template.h
@@ -96,6 +96,48 @@
} while (-- width != 0);
}
+/**
+ * Draw hardware cursor image on the given line.
+ */
+static void glue(draw_hwc_line_, PIXEL_NAME)(SM501State * s, int crt,
+ uint8_t * palette, int c_y, uint8_t *d, int width)
+{
+ int x, i;
+ uint8_t bitset = 0;
+
+ /* get hardware cursor pattern */
+ uint32_t cursor_addr = get_hwc_address(s, crt);
+ assert(0 <= c_y && c_y < SM501_HWC_HEIGHT);
+ cursor_addr += 64 * c_y / 4; /* 4 pixels per byte */
+ cursor_addr += s->base;
+
+ /* get cursor position */
+ x = get_hwc_x(s, crt);
+ d += x * BPP;
+
+ for (i = 0; i < SM501_HWC_WIDTH && x + i < width; i++) {
+ uint8_t v;
+
+ /* get pixel value */
+ if (i % 4 == 0) {
+ cpu_physical_memory_rw(cursor_addr, &bitset, 1, 0);
+ cursor_addr++;
+ }
+ v = bitset & 3;
+ bitset >>= 2;
+
+ /* write pixel */
+ if (v) {
+ v--;
+ uint8_t r = palette[v * 3 + 0];
+ uint8_t g = palette[v * 3 + 1];
+ uint8_t b = palette[v * 3 + 2];
+ ((PIXEL_TYPE *) d)[0] = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
+ }
+ d += BPP;
+ }
+}
+
#undef DEPTH
#undef BPP
#undef PIXEL_TYPE
