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authorGrazvydas Ignotas2011-03-04 18:51:55 +0200
committernotaz2011-08-13 00:57:32 +0300
commit1ab64c5413f79cc38f9b17520df69a4e01041046 (patch)
treebbefeea77932a76f098fd9b7cd9ed054685883f2 /plugins/gpu_neon
parentc006d9e3d7b4c7f0fda6c27062e362cfc7515630 (diff)
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gpu_neon: basic skeleton gpu plugin
Diffstat (limited to 'plugins/gpu_neon')
-rw-r--r--plugins/gpu_neon/Makefile15
-rw-r--r--plugins/gpu_neon/gpu.c242
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) GraÅžvydas "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