gpu_neon: basic skeleton gpu plugin

2 files changed, 257 insertions, 0 deletions

diff --git a/plugins/gpu_neon/Makefile b/plugins/gpu_neon/Makefile
new file mode 100644
index 0000000..aab989f
--- /dev/null
+++ b/plugins/gpu_neon/Makefile
@@ -0,0 +1,15 @@
+CC = $(CROSS_COMPILE)gcc
+CFLAGS += -ggdb -Wall -fPIC
+CFLAGS += -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp
+
+TARGET = gpu_neon.so
+LDFLAGS += -shared -Wl,-soname,$(TARGET)
+SRC += gpu.c ../../frontend/arm_utils.s
+
+all: $(TARGET)
+
+$(TARGET): $(SRC)
+	$(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
+
+clean:
+	$(RM) $(TARGET)
diff --git a/plugins/gpu_neon/gpu.c b/plugins/gpu_neon/gpu.c
new file mode 100644
index 0000000..f905f0a
--- /dev/null
+++ b/plugins/gpu_neon/gpu.c
@@ -0,0 +1,242 @@
+/*
+ * (C) Gražvydas "notaz" Ignotas, 2011
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ *  - GNU GPL, version 2 or later.
+ *  - GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+static struct {
+  uint16_t vram[1024 * 512];
+  uint16_t guard[1024 * 512]; // overdraw guard
+  uint32_t regs[16];
+  union {
+    uint32_t reg;
+    struct {
+      uint32_t tx:4;    //  0 texture page
+      uint32_t ty:1;
+      uint32_t abr:2;
+      uint32_t tp:2;    //  7 t.p. mode (4,8,15bpp)
+      uint32_t dtd:1;   //  9 dither
+      uint32_t dfe:1;
+      uint32_t md:1;    // 11 set mask bit when drawing
+      uint32_t me:1;    // 12 no draw on mask
+      uint32_t unkn:3;
+      uint32_t width1:1;// 16
+      uint32_t width0:2;
+      uint32_t height:1;
+      uint32_t video:1; // 20 NTSC,PAL
+      uint32_t rgb24:1;
+      uint32_t inter:1; // 22 interlace on
+      uint32_t den:1;   // 23 display not enabled
+      uint32_t unkn2:2;
+      uint32_t busy:1;  // 26 !busy drawing
+      uint32_t img:1;   // 27 ready to DMA
+      uint32_t com:1;   // 28 ready for commands
+      uint32_t dma:2;   // 29 off, ?, to vram, from vram
+      uint32_t lcf:1;   // 21 odd frame/blanking?
+    };
+  } status;
+  struct {
+    int x, y, w, h;
+    int y1, y2;
+  } screen;
+  uint32_t blanking;
+} gpu;
+
+long GPUinit(void)
+{
+  return 0;
+}
+
+long GPUshutdown(void)
+{
+  return 0;
+}
+
+uint32_t GPUreadStatus(void)
+{
+  return gpu.status.reg | (gpu.blanking << 31);
+}
+
+void GPUwriteStatus(uint32_t data)
+{
+  static const short hres[8] = { 256, 368, 320, 384, 512, 512, 640, 640 };
+  static const short vres[4] = { 240, 480, 256, 480 };
+  uint32_t cmd = data >> 24;
+
+  switch (data >> 24) {
+    case 0x00:
+      break;
+    case 0x03:
+      gpu.status.den = data & 1;
+      break;
+    case 0x04:
+      gpu.status.dma = data & 3;
+      break;
+    case 0x05:
+      gpu.screen.x = data & 0x3ff;
+      gpu.screen.y = (data >> 10) & 0x3ff;
+      break;
+    case 0x07:
+      gpu.screen.y1 = data & 0x3ff;
+      gpu.screen.y2 = (data >> 10) & 0x3ff;
+      break;
+    case 0x08:
+      gpu.status.reg = (gpu.status.reg & ~0x7f0000) | ((data & 0x3F) << 17) | ((data & 0x40) << 10);
+      gpu.screen.w = hres[(gpu.status.reg >> 16) & 7];
+      gpu.screen.h = vres[(gpu.status.reg >> 19) & 3];
+      break;
+  }
+
+  if (cmd < ARRAY_SIZE(gpu.regs))
+    gpu.regs[cmd] = data;
+}
+
+void GPUreadDataMem(uint32_t *mem, int count)
+{
+}
+
+uint32_t GPUreadData(void)
+{
+  return 0;
+}
+
+void GPUwriteDataMem(uint32_t *mem, int count)
+{
+}
+
+void GPUwriteData(uint32_t gdata)
+{
+}
+
+long GPUdmaChain(uint32_t *base, uint32_t addr)
+{
+  return 0;
+}
+
+typedef struct GPUFREEZETAG
+{
+  uint32_t ulFreezeVersion;      // should be always 1 for now (set by main emu)
+  uint32_t ulStatus;             // current gpu status
+  uint32_t ulControl[256];       // latest control register values
+  unsigned char psxVRam[1024*1024*2]; // current VRam image (full 2 MB for ZN)
+} GPUFreeze_t;
+
+long GPUfreeze(uint32_t type, GPUFreeze_t *freeze)
+{
+  switch (type) {
+    case 1: // save
+      memcpy(freeze->psxVRam, gpu.vram, sizeof(gpu.vram));
+      memcpy(freeze->ulControl, gpu.regs, sizeof(gpu.regs));
+      freeze->ulStatus = gpu.status.reg;
+      freeze->ulControl[255] = gpu.blanking; // abuse free space
+      break;
+    case 0: // load
+      memcpy(gpu.vram, freeze->psxVRam, sizeof(gpu.vram));
+      memcpy(gpu.regs, freeze->ulControl, sizeof(gpu.regs));
+      gpu.status.reg = freeze->ulStatus;
+      gpu.blanking = freeze->ulControl[255];
+      GPUwriteStatus((5 << 24) | gpu.regs[5]);
+      GPUwriteStatus((7 << 24) | gpu.regs[7]);
+      GPUwriteStatus((8 << 24) | gpu.regs[8]);
+      break;
+  }
+
+  return 1;
+}
+
+void GPUvBlank(int val)
+{
+  gpu.blanking = !!val;
+}
+
+// rearmed specific
+
+#include "../../frontend/plugin_lib.h"
+#include "../../frontend/arm_utils.h"
+
+static const struct rearmed_cbs *cbs;
+static void *screen_buf;
+
+static void blit(void)
+{
+  static uint32_t old_status, old_h;
+  int x = gpu.screen.x & ~3; // alignment needed by blitter
+  int y = gpu.screen.y;
+  int w = gpu.screen.w;
+  int h;
+  uint16_t *srcs;
+  uint8_t  *dest;
+
+  srcs = &gpu.vram[y * 1024 + x];
+
+  h = gpu.screen.y2 - gpu.screen.y1;
+
+  if (h <= 0)
+    return;
+
+  if ((gpu.status.reg ^ old_status) & ((7<<16)|(1<<21)) || h != old_h) // width|rgb24 change?
+  {
+    old_status = gpu.status.reg;
+    old_h = h;
+    screen_buf = cbs->pl_fbdev_set_mode(w, h, gpu.status.rgb24 ? 24 : 16);
+  }
+  dest = screen_buf;
+
+  if (gpu.status.rgb24)
+  {
+#ifndef MAEMO
+    for (; h-- > 0; dest += w * 3, srcs += 1024)
+    {
+      bgr888_to_rgb888(dest, srcs, w * 3);
+    }
+#else
+    for (; h-- > 0; dest += w * 2, srcs += 1024)
+    {
+      bgr888_to_rgb565(dest, srcs, w * 3);
+    }
+#endif
+  }
+  else
+  {
+    for (; h-- > 0; dest += w * 2, srcs += 1024)
+    {
+      bgr555_to_rgb565(dest, srcs, w * 2);
+    }
+  }
+
+  screen_buf = cbs->pl_fbdev_flip();
+}
+
+void GPUupdateLace(void)
+{
+  blit();
+}
+
+long GPUopen(void)
+{
+  cbs->pl_fbdev_open();
+  screen_buf = cbs->pl_fbdev_flip();
+  return 0;
+}
+
+long GPUclose(void)
+{
+  cbs->pl_fbdev_close();
+  return 0;
+}
+
+void GPUrearmedCallbacks(const struct rearmed_cbs *cbs_)
+{
+  cbs = cbs_;
+}
+
+// vim:shiftwidth=2:expandtab