RetroArch/gfx/gl_common.c

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2015 - 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/>.
 */

#include "gl_common.h"

void gl_load_texture_data(GLuint id,
      enum gfx_wrap_type wrap_type,
      enum texture_filter_type filter_type,
      unsigned alignment,
      unsigned width, unsigned height,
      const void *frame, unsigned base_size)
{
   GLint mag_filter, min_filter;
   bool want_mipmap = false;
   bool rgb32 = (base_size == (sizeof(uint32_t)));
   driver_t *driver = driver_get_ptr();
   GLenum wrap = gl_wrap_type_to_enum(wrap_type);

   glBindTexture(GL_TEXTURE_2D, id);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap);

   switch (filter_type)
   {
      case TEXTURE_FILTER_MIPMAP_LINEAR:
         min_filter = GL_LINEAR_MIPMAP_NEAREST;
         mag_filter = GL_LINEAR;
#ifndef HAVE_PSGL
         want_mipmap = true;
#endif
         break;
      case TEXTURE_FILTER_MIPMAP_NEAREST:
         min_filter = GL_NEAREST_MIPMAP_NEAREST;
         mag_filter = GL_NEAREST;
#ifndef HAVE_PSGL
         want_mipmap = true;
#endif
         break;
      case TEXTURE_FILTER_NEAREST:
         min_filter = GL_NEAREST;
         mag_filter = GL_NEAREST;
         break;
      case TEXTURE_FILTER_LINEAR:
      default:
         min_filter = GL_LINEAR;
         mag_filter = GL_LINEAR;
         break;
   }

   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);

#ifndef HAVE_PSGL
   glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
#endif
   glTexImage2D(GL_TEXTURE_2D,
         0,
         (driver->gfx_use_rgba || !rgb32) ? GL_RGBA : RARCH_GL_INTERNAL_FORMAT32,
         width, height, 0,
         (driver->gfx_use_rgba || !rgb32) ? GL_RGBA : RARCH_GL_TEXTURE_TYPE32,
         (rgb32) ? RARCH_GL_FORMAT32 : GL_UNSIGNED_SHORT_4_4_4_4, frame);

   if (want_mipmap)
      glGenerateMipmap(GL_TEXTURE_2D);
}

bool gl_load_luts(const struct video_shader *shader,
      GLuint *textures_lut)
{
   unsigned i;
   unsigned num_luts = min(shader->luts, GFX_MAX_TEXTURES);

   if (!shader->luts)
      return true;

   glGenTextures(num_luts, textures_lut);

   for (i = 0; i < num_luts; i++)
   {
      struct texture_image img = {0};
      enum texture_filter_type filter_type = TEXTURE_FILTER_LINEAR;

      RARCH_LOG("Loading texture image from: \"%s\" ...\n",
            shader->lut[i].path);

      if (!texture_image_load(&img, shader->lut[i].path))
      {
         RARCH_ERR("Failed to load texture image from: \"%s\"\n",
               shader->lut[i].path);
         return false;
      }

      if (shader->lut[i].filter == RARCH_FILTER_NEAREST)
         filter_type = TEXTURE_FILTER_NEAREST;

      if (shader->lut[i].mipmap)
      {
         if (filter_type == TEXTURE_FILTER_NEAREST)
            filter_type = TEXTURE_FILTER_MIPMAP_NEAREST;
         else
            filter_type = TEXTURE_FILTER_MIPMAP_LINEAR;
      }

      gl_load_texture_data(textures_lut[i],
            shader->lut[i].wrap,
            filter_type, 4,
            img.width, img.height,
            img.pixels, sizeof(uint32_t));
      texture_image_free(&img);
   }

   glBindTexture(GL_TEXTURE_2D, 0);
   return true;
}

static INLINE bool realloc_checked(void **ptr, size_t size)
{
   void *nptr;

   if (*ptr)
      nptr = realloc(*ptr, size);
   else
      nptr = malloc(size);

   if (nptr)
      *ptr = nptr;

   return *ptr == nptr;
}

bool gl_coord_array_add(gl_coord_array_t *ca, const gl_coords_t *coords, unsigned count)
{
   bool success = false;
   count = min(count, coords->vertices);

   if (ca->coords.vertices + count >= ca->allocated)
   {
      unsigned alloc_size = next_pow2(ca->coords.vertices + count);
      size_t base_size    = sizeof(GLfloat) * alloc_size;

      bool vert_ok  = realloc_checked((void**)&ca->coords.vertex,        2 * base_size);
      bool color_ok = realloc_checked((void**)&ca->coords.color,         4 * base_size);
      bool tex_ok   = realloc_checked((void**)&ca->coords.tex_coord,     2 * base_size);
      bool lut_ok   = realloc_checked((void**)&ca->coords.lut_tex_coord, 2 * base_size);

      if (vert_ok && color_ok && tex_ok && lut_ok)
      {
         ca->allocated = alloc_size;
         success       = true;
      }
   }
   else
      success = true;

   if (success)
   {
      size_t base_size = coords->vertices * sizeof(GLfloat);
      size_t offset    = ca->coords.vertices;

      /* XXX: i wish we used interlaced arrays so we could call memcpy only once */
      memcpy(ca->coords.vertex        + offset * 2,        coords->vertex, base_size * 2);
      memcpy(ca->coords.color         + offset * 4,         coords->color, base_size * 4);
      memcpy(ca->coords.tex_coord     + offset * 2,     coords->tex_coord, base_size * 2);
      memcpy(ca->coords.lut_tex_coord + offset * 2, coords->lut_tex_coord, base_size * 2);

      ca->coords.vertices += count;
   }
   else
      RARCH_WARN("Allocation failed.");

   return success;
}

void gl_coord_array_free(gl_coord_array_t *ca)
{
   if (!ca->allocated)
      return;

   free(ca->coords.vertex);
   free(ca->coords.color);
   free(ca->coords.tex_coord);
   free(ca->coords.lut_tex_coord);

   ca->coords.vertex = NULL;
   ca->coords.color = NULL;
   ca->coords.tex_coord = NULL;
   ca->coords.lut_tex_coord = NULL;

   ca->coords.vertices = 0;
   ca->allocated       = 0;
}