Add Upscale1.5x video filter

Makefile.common

@@ -2286,7 +2286,8 @@ ifeq ($(HAVE_STATIC_VIDEO_FILTERS), 1)
           gfx/video_filters/gameboy3x.o \
           gfx/video_filters/gameboy4x.o \
           gfx/video_filters/dot_matrix_3x.o \
-          gfx/video_filters/dot_matrix_4x.o
+          gfx/video_filters/dot_matrix_4x.o \
+          gfx/video_filters/upscale_1_5x.o
 endif
 
 ifeq ($(WANT_IOSUHAX), 1)

gfx/video_filter.c

@@ -290,6 +290,7 @@ extern const struct softfilter_implementation *gameboy3x_get_implementation(soft
 extern const struct softfilter_implementation *gameboy4x_get_implementation(softfilter_simd_mask_t simd);
 extern const struct softfilter_implementation *dot_matrix_3x_get_implementation(softfilter_simd_mask_t simd);
 extern const struct softfilter_implementation *dot_matrix_4x_get_implementation(softfilter_simd_mask_t simd);
+extern const struct softfilter_implementation *upscale_1_5x_get_implementation(softfilter_simd_mask_t simd);
 
 static const softfilter_get_implementation_t soft_plugs_builtin[] = {
    blargg_ntsc_snes_get_implementation,
@@ -313,6 +314,7 @@ static const softfilter_get_implementation_t soft_plugs_builtin[] = {
    gameboy4x_get_implementation,
    dot_matrix_3x_get_implementation,
    dot_matrix_4x_get_implementation,
+   upscale_1_5x_get_implementation,
 };
 
 static bool append_softfilter_plugs(rarch_softfilter_t *filt,

gfx/video_filters/Makefile

@@ -73,7 +73,8 @@ objects += blargg_ntsc_snes.$(DYLIB) phosphor2x.$(DYLIB) epx.$(DYLIB) lq2x.$(DYL
 	   normal2x_width.$(DYLIB) normal2x_height.$(DYLIB) normal4x.$(DYLIB) \
 	   scanline2x.$(DYLIB) grid2x.$(DYLIB) grid3x.$(DYLIB) \
 	   gameboy3x.$(DYLIB) gameboy4x.$(DYLIB) \
-	   dot_matrix_3x.$(DYLIB) dot_matrix_4x.$(DYLIB)
+	   dot_matrix_3x.$(DYLIB) dot_matrix_4x.$(DYLIB) \
+	   upscale_1_5x.$(DYLIB)
 
 all: build;
 

gfx/video_filters/Upscale1.5x.filt

@@ -0,0 +1 @@
+filter = upscale_1_5x

gfx/video_filters/upscale_1_5x.c

@@ -0,0 +1,301 @@
+/*  RetroArch - A frontend for libretro.
+ *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
+ *  Copyright (C) 2011-2018 - Daniel De Matteis
+ *
+ *  RetroArch is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with RetroArch.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Compile: gcc -o upscale_1_5x.so -shared upscale_1_5x.c -std=c99 -O3 -Wall -pedantic -fPIC */
+
+#include "softfilter.h"
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef RARCH_INTERNAL
+#define softfilter_get_implementation upscale_1_5x_get_implementation
+#define softfilter_thread_data upscale_1_5x_softfilter_thread_data
+#define filter_data upscale_1_5x_filter_data
+#endif
+
+struct softfilter_thread_data
+{
+   void *out_data;
+   const void *in_data;
+   size_t out_pitch;
+   size_t in_pitch;
+   unsigned colfmt;
+   unsigned width;
+   unsigned height;
+   int first;
+   int last;
+};
+
+struct filter_data
+{
+   unsigned threads;
+   struct softfilter_thread_data *workers;
+   unsigned in_fmt;
+};
+
+static unsigned upscale_1_5x_generic_input_fmts(void)
+{
+   return SOFTFILTER_FMT_XRGB8888 | SOFTFILTER_FMT_RGB565;
+}
+
+static unsigned upscale_1_5x_generic_output_fmts(unsigned input_fmts)
+{
+   return input_fmts;
+}
+
+static unsigned upscale_1_5x_generic_threads(void *data)
+{
+   struct filter_data *filt = (struct filter_data*)data;
+   return filt->threads;
+}
+
+static void *upscale_1_5x_generic_create(const struct softfilter_config *config,
+      unsigned in_fmt, unsigned out_fmt,
+      unsigned max_width, unsigned max_height,
+      unsigned threads, softfilter_simd_mask_t simd, void *userdata)
+{
+   struct filter_data *filt = (struct filter_data*)calloc(1, sizeof(*filt));
+   (void)simd;
+   (void)config;
+   (void)userdata;
+
+   if (!filt) {
+      return NULL;
+   }
+   /* Apparently the code is not thread-safe,
+    * so force single threaded operation... */
+   filt->workers = (struct softfilter_thread_data*)calloc(1, sizeof(struct softfilter_thread_data));
+   filt->threads = 1;
+   filt->in_fmt  = in_fmt;
+   if (!filt->workers) {
+      free(filt);
+      return NULL;
+   }
+   return filt;
+}
+
+static void upscale_1_5x_generic_output(void *data,
+      unsigned *out_width, unsigned *out_height,
+      unsigned width, unsigned height)
+{
+   *out_width  = width  + (width  >> 1);
+   *out_height = height + (height >> 1);
+}
+
+static void upscale_1_5x_generic_destroy(void *data)
+{
+   struct filter_data *filt = (struct filter_data*)data;
+   if (!filt) {
+      return;
+   }
+   free(filt->workers);
+   free(filt);
+}
+
+static void upscale_1_5x_work_cb_xrgb8888(void *data, void *thread_data)
+{
+   struct softfilter_thread_data *thr = (struct softfilter_thread_data*)thread_data;
+   const uint32_t *input              = (const uint32_t*)thr->in_data;
+   uint32_t *output                   = (uint32_t*)thr->out_data;
+   uint32_t in_stride                 = (uint32_t)(thr->in_pitch >> 2);
+   uint32_t out_stride                = (uint32_t)(thr->out_pitch >> 2);
+   uint32_t x, y;
+
+   uint32_t color_a;
+   uint32_t color_b;
+   uint32_t color_c;
+   uint32_t color_d;
+   uint32_t color_ab;
+   uint32_t color_cd;
+
+   /* Before:
+    *    a b
+    *    c d
+    *
+    * After (parenthesis = average):
+    *    a      (a,b)      b
+    *    (a,c)  (a,b,c,d)  (b,d)
+    *    c      (c,d)      d
+    */
+
+   for (y = 0; y < thr->height >> 1; y++)
+   {
+      uint32_t *out_ptr = output;
+      for (x = 0; x < thr->width >> 1; x++)
+      {
+         const uint32_t *in_line_ptr = input + (x << 1);
+         uint32_t *out_line_ptr      = out_ptr;
+
+         color_a      = *in_line_ptr;
+         color_b      = *(in_line_ptr + 1);
+         in_line_ptr += in_stride;
+
+         color_c      = *in_line_ptr;
+         color_d      = *(in_line_ptr + 1);
+
+         color_ab     = (color_a + color_b + ((color_a ^ color_b) & 0x1010101)) >> 1;
+         color_cd     = (color_c + color_d + ((color_c ^ color_d) & 0x1010101)) >> 1;
+
+         /* Row 1 */
+         *out_line_ptr       = color_a;
+         *(out_line_ptr + 1) = color_ab;
+         *(out_line_ptr + 2) = color_b;
+         out_line_ptr       += out_stride;
+
+         /* Row 2 */
+         *out_line_ptr       = (color_a  + color_c  + ((color_a  ^ color_c)  & 0x1010101)) >> 1;
+         *(out_line_ptr + 1) = (color_ab + color_cd + ((color_ab ^ color_cd) & 0x1010101)) >> 1;
+         *(out_line_ptr + 2) = (color_b  + color_d  + ((color_b  ^ color_d)  & 0x1010101)) >> 1;
+         out_line_ptr       += out_stride;
+
+         /* Row 3 */
+         *out_line_ptr       = color_c;
+         *(out_line_ptr + 1) = color_cd;
+         *(out_line_ptr + 2) = color_d;
+
+         out_ptr += 3;
+      }
+
+      input  += in_stride << 1;
+      output += out_stride * 3;
+   }
+}
+
+static void upscale_1_5x_work_cb_rgb565(void *data, void *thread_data)
+{
+   struct softfilter_thread_data *thr = (struct softfilter_thread_data*)thread_data;
+   const uint16_t *input              = (const uint16_t*)thr->in_data;
+   uint16_t *output                   = (uint16_t*)thr->out_data;
+   uint16_t in_stride                 = (uint16_t)(thr->in_pitch >> 1);
+   uint16_t out_stride                = (uint16_t)(thr->out_pitch >> 1);
+   uint16_t x, y;
+
+   uint16_t color_a;
+   uint16_t color_b;
+   uint16_t color_c;
+   uint16_t color_d;
+   uint16_t color_ab;
+   uint16_t color_cd;
+
+   /* Before:
+    *    a b
+    *    c d
+    *
+    * After (parenthesis = average):
+    *    a      (a,b)      b
+    *    (a,c)  (a,b,c,d)  (b,d)
+    *    c      (c,d)      d
+    */
+
+   for (y = 0; y < thr->height >> 1; y++)
+   {
+      uint16_t *out_ptr = output;
+      for (x = 0; x < thr->width >> 1; x++)
+      {
+         const uint16_t *in_line_ptr = input + (x << 1);
+         uint16_t *out_line_ptr      = out_ptr;
+
+         color_a      = *in_line_ptr;
+         color_b      = *(in_line_ptr + 1);
+         in_line_ptr += in_stride;
+
+         color_c      = *in_line_ptr;
+         color_d      = *(in_line_ptr + 1);
+
+         color_ab     = (color_a + color_b + ((color_a ^ color_b) & 0x821)) >> 1;
+         color_cd     = (color_c + color_d + ((color_c ^ color_d) & 0x821)) >> 1;
+
+         /* Row 1 */
+         *out_line_ptr       = color_a;
+         *(out_line_ptr + 1) = color_ab;
+         *(out_line_ptr + 2) = color_b;
+         out_line_ptr       += out_stride;
+
+         /* Row 2 */
+         *out_line_ptr       = (color_a  + color_c  + ((color_a  ^ color_c)  & 0x821)) >> 1;
+         *(out_line_ptr + 1) = (color_ab + color_cd + ((color_ab ^ color_cd) & 0x821)) >> 1;
+         *(out_line_ptr + 2) = (color_b  + color_d  + ((color_b  ^ color_d)  & 0x821)) >> 1;
+         out_line_ptr       += out_stride;
+
+         /* Row 3 */
+         *out_line_ptr       = color_c;
+         *(out_line_ptr + 1) = color_cd;
+         *(out_line_ptr + 2) = color_d;
+
+         out_ptr += 3;
+      }
+
+      input  += in_stride << 1;
+      output += out_stride * 3;
+   }
+}
+
+static void upscale_1_5x_generic_packets(void *data,
+      struct softfilter_work_packet *packets,
+      void *output, size_t output_stride,
+      const void *input, unsigned width, unsigned height, size_t input_stride)
+{
+   /* We are guaranteed single threaded operation
+    * (filt->threads = 1) so we don't need to loop
+    * over threads and can cull some code. This only
+    * makes the tiniest performance difference, but
+    * every little helps when running on an o3DS... */
+   struct filter_data *filt = (struct filter_data*)data;
+   struct softfilter_thread_data *thr = (struct softfilter_thread_data*)&filt->workers[0];
+
+   thr->out_data = (uint8_t*)output;
+   thr->in_data = (const uint8_t*)input;
+   thr->out_pitch = output_stride;
+   thr->in_pitch = input_stride;
+   thr->width = width;
+   thr->height = height;
+
+   if (filt->in_fmt == SOFTFILTER_FMT_XRGB8888) {
+      packets[0].work = upscale_1_5x_work_cb_xrgb8888;
+   } else if (filt->in_fmt == SOFTFILTER_FMT_RGB565) {
+      packets[0].work = upscale_1_5x_work_cb_rgb565;
+   }
+   packets[0].thread_data = thr;
+}
+
+static const struct softfilter_implementation upscale_1_5x_generic = {
+   upscale_1_5x_generic_input_fmts,
+   upscale_1_5x_generic_output_fmts,
+
+   upscale_1_5x_generic_create,
+   upscale_1_5x_generic_destroy,
+
+   upscale_1_5x_generic_threads,
+   upscale_1_5x_generic_output,
+   upscale_1_5x_generic_packets,
+
+   SOFTFILTER_API_VERSION,
+   "Upscale1.5x",
+   "upscale_1_5x",
+};
+
+const struct softfilter_implementation *softfilter_get_implementation(
+      softfilter_simd_mask_t simd)
+{
+   (void)simd;
+   return &upscale_1_5x_generic;
+}
+
+#ifdef RARCH_INTERNAL
+#undef softfilter_get_implementation
+#undef softfilter_thread_data
+#undef filter_data
+#endif

griffin/griffin.c

@@ -1025,6 +1025,7 @@ FILTERS
 #include "../gfx/video_filters/gameboy4x.c"
 #include "../gfx/video_filters/dot_matrix_3x.c"
 #include "../gfx/video_filters/dot_matrix_4x.c"
+#include "../gfx/video_filters/upscale_1_5x.c"
 #endif
 
 #ifdef HAVE_DSP_FILTER