From 539e77b122e091d0a79c9f1a16d659b4dfd93ee8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Higor=20Eur=C3=ADpedes?= <heuripedes@gmail.com>
Date: Wed, 25 Mar 2015 09:48:09 -0300
Subject: [PATCH] (gl) Add gl_coord_array_t

---
 gfx/gl_common.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 gfx/gl_common.h | 22 +++++++++++++--
 2 files changed, 94 insertions(+), 2 deletions(-)

diff --git a/gfx/gl_common.c b/gfx/gl_common.c
index 8a0ae3c111..1f63fedd1b 100644
--- a/gfx/gl_common.c
+++ b/gfx/gl_common.c
@@ -125,3 +125,77 @@ bool gl_load_luts(const struct video_shader *shader,
    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_release(gl_coord_array_t *ca)
+{
+   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;
+}
diff --git a/gfx/gl_common.h b/gfx/gl_common.h
index 30ed555f62..0589670899 100644
--- a/gfx/gl_common.h
+++ b/gfx/gl_common.h
@@ -231,14 +231,29 @@ struct gl_tex_info
    GLfloat coord[8];
 };
 
-struct gl_coords
+typedef struct gl_coords
 {
    const GLfloat *vertex;
    const GLfloat *color;
    const GLfloat *tex_coord;
    const GLfloat *lut_tex_coord;
    unsigned vertices;
-};
+} gl_coords_t;
+
+typedef struct gl_mut_coords
+{
+   GLfloat *vertex;
+   GLfloat *color;
+   GLfloat *tex_coord;
+   GLfloat *lut_tex_coord;
+   unsigned vertices;
+} gl_mut_coords_t;
+
+typedef struct gl_coord_array
+{
+   gl_mut_coords_t coords;
+   unsigned allocated;
+} gl_coord_array_t;
 
 typedef struct gl
 {
@@ -422,4 +437,7 @@ static INLINE unsigned gl_wrap_type_to_enum(enum gfx_wrap_type type)
    return 0;
 }
 
+bool gl_coord_array_add(gl_coord_array_t *ca, const gl_coords_t *coords, unsigned count);
+void gl_coord_array_release(gl_coord_array_t *ca);
+
 #endif