Some progress

2026-06-19 14:24:09 -05:00
parent 4e491d8332
commit 1f67e817ae
55 changed files with 2033 additions and 12 deletions
@@ -0,0 +1,88 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "display/displaysat.h"
+#include "display/render/rendersat.h"
+#include "display/display.h"
+#include "assert/assert.h"
+#include "log/log.h"
+#include <vdp1/cmdt.h>
+#include <vdp2/cram.h>
+#include <vdp2/tvmd.h>
+#include <vdp2/scrn.h>
+#include <vdp2/vram.h>
+
+errorret_t displaySaturnInit(void) {
+  logDebug("[Saturn] displaySaturnInit: start\n");
+  DISPLAY.whichBuffer = 0;
+
+  /*
+   * TV mode: NTSC, 320×224, non-interlaced.
+   * Yaul's vdp2_tvmd_display_res_set() configures the sync standard and
+   * horizontal/vertical resolution.
+   *
+   * TODO: replace with the Yaul typed call when integrating the full SDK:
+   *   vdp2_tvmd_display_res_set(VDP2_TVMD_INTERLACE_NONE,
+   *                              VDP2_TVMD_HORZ_NORMAL_A,
+   *                              VDP2_TVMD_VERT_224);
+   *   vdp2_tvmd_display_set();
+   */
+
+  /*
+   * VDP2 scroll planes: disable all NBG/RBG planes for now; game content is
+   * drawn entirely via VDP1 sprites.  Tilemap chunks will re-enable NBG0
+   * when the VDP2 tilemap backend is implemented.
+   *
+   * TODO:
+   *   vdp2_scrn_display_set(VDP2_SCRN_DISP_NBG0, false);
+   *   vdp2_scrn_display_set(VDP2_SCRN_DISP_NBG1, false);
+   *   ...
+   */
+
+  /*
+   * VDP1 initialisation: the hardware starts drawing from VRAM offset 0.
+   * We place our command table there and texture data afterward.
+   *
+   * TODO:
+   *   vdp1_vram_partitions_set(
+   *     VDP1_VRAM_CYCP_...,   // cycle patterns
+   *     ...
+   *   );
+   */
+
+  logDebug("[Saturn] displaySaturnInit: calling renderSaturnInit\n");
+  errorChain(renderSaturnInit());
+
+  logDebug("[Saturn] displaySaturnInit: done\n");
+  errorOk();
+}
+
+errorret_t displaySaturnFlush(ropbuffer_t *buf) {
+  assertNotNull(buf, "Saturn flush: null ropbuffer");
+  errorChain(renderSaturnFlush(buf));
+  errorOk();
+}
+
+errorret_t displaySaturnSwap(void) {
+  logDebug("[Saturn] displaySaturnSwap\n");
+  /*
+   * Wait for VDP1 to finish rendering the current frame then swap buffers.
+   *
+   * TODO:
+   *   vdp1_sync_render();
+   *   vdp1_sync();
+   *   vdp2_sync();
+   *   vdp2_sync_wait();
+   */
+  DISPLAY.whichBuffer ^= 1;
+  errorOk();
+}
+
+void displaySaturnDispose(void) {
+  logDebug("[Saturn] displaySaturnDispose\n");
+  renderSaturnDispose();
+}