From 475aa1f1fa43713af21aae1ad99c9a95c3947981 Mon Sep 17 00:00:00 2001
From: Allanis <allanis@saracraft.net>
Date: Sat, 20 Jul 2013 19:06:36 +0100
Subject: [PATCH] [Add] Check for multitexture abilities and texture leaks.

---
 src/opengl.c | 22 ++++++++++++++++++++--
 src/opengl.h |  1 +
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/opengl.c b/src/opengl.c
index b39df7f..15f90bd 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -14,6 +14,9 @@
 #include "pack.h"
 #include "opengl.h"
 
+/* Requirements. */
+#define OPENGL_REQ_MULTITEX 3
+
 /* The screen info, gives data of current opengl settings. */
 glInfo gl_screen;
 
@@ -896,8 +899,9 @@ int gl_init(void) {
   if(gl_hasExt("GL_ARB_fragment_shader")==GL_TRUE)
     gl_screen.flags |= OPENGL_FRAG_SHADER;
 
-  /* Max texture size. */
+  /* Texture information. */
   glGetIntegerv(GL_MAX_TEXTURE_SIZE, &gl_screen.tex_max);
+  glGetIntegerv(GL_MAX_TEXTURE_UNITS, &gl_screen.multitex_max);
 
   /* Debug heaven. */
   DEBUG("OpenGL Window Created: %dx%d@%dbpp %s", SCREEN_W, SCREEN_H,
@@ -910,8 +914,12 @@ int gl_init(void) {
 
   DEBUG("Renderer: %s", glGetString(GL_RENDERER));
   DEBUG("Version: %s", glGetString(GL_VERSION));
+  /* Now check for things that can be bad. */
+  if(gl_screen.multitex_max < OPENGL_REQ_MULTITEX)
+    WARN("Missing texture units (%d required, %d found)",
+        OPENGL_REQ_MULTITEX, gl_screen.multitex_max);
   if(!gl_has(OPENGL_FRAG_SHADER))
-    DEBUG("No fragment shader extension detected");
+    DEBUG("No fragment shader extension detected"); /* Not a warning yet. */
   DEBUG("");
 
   /* Some openGL options. */
@@ -947,6 +955,16 @@ int gl_init(void) {
 
 /* Clean up our mess. */
 void gl_exit(void) {
+  glTexList* tex;
+
+  /* Make sure there's no texture leak. */
+  if(texture_list != NULL) {
+    DEBUG("Texture leak detected!");
+    for(tex = texture_list; tex != NULL; tex = tex->next)
+      DEBUG("   '%s' opened %d times", tex->tex->name, tex->used);
+  }
+
+  /* Shut down the subsystem. */
   SDL_QuitSubSystem(SDL_INIT_VIDEO);
 }
 
diff --git a/src/opengl.h b/src/opengl.h
index 2314080..895c852 100644
--- a/src/opengl.h
+++ b/src/opengl.h
@@ -34,6 +34,7 @@ typedef struct glInfo_ {
   int r, g, b, a;   /* Framebuffer values in bits. */
   int flags;        /* Store different properties. */
   int tex_max;      /* Max texture size. */
+  int multitex_max; /* Max multitexture levels. */
 } glInfo;
 extern glInfo gl_screen; /* Local structure set with gl_init etc. */