winsys: Add fbdev software winsys.

This is a simple winsys that mmap()s the framebuffer device and
memcpy()s the contents of display targets to the framebuffer device for
displaying.

src/gallium/winsys/sw/fbdev/Makefile

@@ -0,0 +1,13 @@
+TOP = ../../../../..
+include $(TOP)/configs/current
+
+LIBNAME = fbdev
+
+LIBRARY_INCLUDES =
+
+LIBRARY_DEFINES =
+
+C_SOURCES = \
+	fbdev_sw_winsys.c
+
+include ../../../Makefile.template

src/gallium/winsys/sw/fbdev/SConscript

@@ -0,0 +1,23 @@
+#######################################################################
+# SConscript for fbdev winsys
+
+
+Import('*')
+
+if env['platform'] == 'linux':
+
+    env = env.Clone()
+
+    env.Append(CPPPATH = [
+        '#/src/gallium/include',
+        '#/src/gallium/auxiliary',
+        '#/src/gallium/drivers',
+    ])
+
+    ws_fbdev = env.ConvenienceLibrary(
+        target = 'ws_fbdev',
+        source = [
+           'fbdev_sw_winsys.c',
+        ]
+    )
+    Export('ws_fbdev')

src/gallium/winsys/sw/fbdev/fbdev_sw_winsys.c

@@ -0,0 +1,224 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <linux/fb.h>
+
+#include "pipe/p_compiler.h"
+#include "util/u_format.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "state_tracker/sw_winsys.h"
+
+#include "fbdev_sw_winsys.h"
+
+struct fbdev_sw_displaytarget
+{
+   enum pipe_format format;
+   unsigned width;
+   unsigned height;
+   unsigned stride;
+
+   void *data;
+   void *mapped;
+};
+
+struct fbdev_sw_winsys
+{
+   struct sw_winsys base;
+
+   int fd;
+   enum pipe_format format;
+
+   struct fb_fix_screeninfo finfo;
+   void *fbmem;
+   unsigned rows;
+   unsigned stride;
+};
+
+static INLINE struct fbdev_sw_displaytarget *
+fbdev_sw_displaytarget(struct sw_displaytarget *dt)
+{
+   return (struct fbdev_sw_displaytarget *) dt;
+}
+
+static INLINE struct fbdev_sw_winsys *
+fbdev_sw_winsys(struct sw_winsys *ws)
+{
+   return (struct fbdev_sw_winsys *) ws;
+}
+
+static void
+fbdev_displaytarget_display(struct sw_winsys *ws,
+                            struct sw_displaytarget *dt,
+                            void *context_private)
+{
+   struct fbdev_sw_winsys *fbdev = fbdev_sw_winsys(ws);
+   struct fbdev_sw_displaytarget *fbdt = fbdev_sw_displaytarget(dt);
+   unsigned rows, len, i;
+
+   rows = MIN2(fbdt->height, fbdev->rows);
+   len = util_format_get_stride(fbdt->format, fbdt->width);
+   len = MIN2(len, fbdev->stride);
+
+   for (i = 0; i < rows; i++) {
+      void *dst = fbdev->fbmem + fbdev->stride * i;
+      void *src = fbdt->data + fbdt->stride * i;
+
+      memcpy(dst, src, len);
+   }
+}
+
+static void
+fbdev_displaytarget_unmap(struct sw_winsys *ws,
+                           struct sw_displaytarget *dt)
+{
+   struct fbdev_sw_displaytarget *fbdt = fbdev_sw_displaytarget(dt);
+   fbdt->mapped = NULL;
+}
+
+static void *
+fbdev_displaytarget_map(struct sw_winsys *ws,
+                        struct sw_displaytarget *dt,
+                        unsigned flags)
+{
+   struct fbdev_sw_displaytarget *fbdt = fbdev_sw_displaytarget(dt);
+   fbdt->mapped = fbdt->data;
+   return fbdt->mapped;
+}
+
+static void
+fbdev_displaytarget_destroy(struct sw_winsys *ws,
+                            struct sw_displaytarget *dt)
+{
+   struct fbdev_sw_displaytarget *fbdt = fbdev_sw_displaytarget(dt);
+
+   if (fbdt->data)
+      align_free(fbdt->data);
+
+   FREE(fbdt);
+}
+
+static struct sw_displaytarget *
+fbdev_displaytarget_create(struct sw_winsys *ws,
+                           unsigned tex_usage,
+                           enum pipe_format format,
+                           unsigned width, unsigned height,
+                           unsigned alignment,
+                           unsigned *stride)
+{
+   struct fbdev_sw_winsys *fbdev = fbdev_sw_winsys(ws);
+   struct fbdev_sw_displaytarget *fbdt;
+   unsigned nblocksy, size, format_stride;
+
+   if (fbdev->format != format)
+      return NULL;
+
+   fbdt = CALLOC_STRUCT(fbdev_sw_displaytarget);
+   if (!fbdt)
+      return NULL;
+
+   fbdt->format = format;
+   fbdt->width = width;
+   fbdt->height = height;
+
+   format_stride = util_format_get_stride(format, width);
+   fbdt->stride = align(format_stride, alignment);
+
+   nblocksy = util_format_get_nblocksy(format, height);
+   size = fbdt->stride * nblocksy;
+
+   fbdt->data = align_malloc(size, alignment);
+   if (!fbdt->data) {
+      FREE(fbdt);
+      return NULL;
+   }
+
+   *stride = fbdt->stride;
+
+   return (struct sw_displaytarget *) fbdt;
+}
+
+static boolean
+fbdev_is_displaytarget_format_supported(struct sw_winsys *ws,
+                                        unsigned tex_usage,
+                                        enum pipe_format format)
+{
+   struct fbdev_sw_winsys *fbdev = fbdev_sw_winsys(ws);
+   return (fbdev->format == format);
+}
+
+static void
+fbdev_destroy(struct sw_winsys *ws)
+{
+   struct fbdev_sw_winsys *fbdev = fbdev_sw_winsys(ws);
+
+   munmap(fbdev->fbmem, fbdev->finfo.smem_len);
+   FREE(fbdev);
+}
+
+struct sw_winsys *
+fbdev_create_sw_winsys(int fd, enum pipe_format format)
+{
+   struct fbdev_sw_winsys *fbdev;
+
+   fbdev = CALLOC_STRUCT(fbdev_sw_winsys);
+   if (!fbdev)
+      return NULL;
+
+   fbdev->fd = fd;
+   fbdev->format = format;
+   if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->finfo)) {
+      FREE(fbdev);
+      return NULL;
+   }
+
+   fbdev->fbmem = mmap(0, fbdev->finfo.smem_len,
+         PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
+   if (fbdev->fbmem == MAP_FAILED) {
+      FREE(fbdev);
+      return NULL;
+   }
+
+   fbdev->rows = fbdev->finfo.smem_len / fbdev->finfo.line_length;
+   fbdev->stride = fbdev->finfo.line_length;
+
+   fbdev->base.destroy = fbdev_destroy;
+   fbdev->base.is_displaytarget_format_supported =
+      fbdev_is_displaytarget_format_supported;
+
+   fbdev->base.displaytarget_create = fbdev_displaytarget_create;
+   fbdev->base.displaytarget_destroy = fbdev_displaytarget_destroy;
+   fbdev->base.displaytarget_map = fbdev_displaytarget_map;
+   fbdev->base.displaytarget_unmap = fbdev_displaytarget_unmap;
+
+   fbdev->base.displaytarget_display = fbdev_displaytarget_display;
+
+   return &fbdev->base;
+}

src/gallium/winsys/sw/fbdev/fbdev_sw_winsys.h

@@ -0,0 +1,38 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.8
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef FBDEV_SW_WINSYS
+#define FBDEV_SW_WINSYS
+
+struct sw_winsys;
+enum pipe_format;
+
+struct sw_winsys *
+fbdev_create_sw_winsys(int fd, enum pipe_format format);
+
+#endif /* FBDEV_SW_WINSYS */