diff --git a/jshader.cpp b/jshader.cpp
index 4fc2a7e..36e240a 100644
--- a/jshader.cpp
+++ b/jshader.cpp
@@ -26,6 +26,7 @@ namespace shader
     SDL_FPoint tex_size = {320, 240};
     bool usingOpenGL;
     GLuint texture_number;
+    GLuint nose;
 
     #ifndef __APPLE__
 
@@ -144,7 +145,11 @@ namespace shader
         printf("tex size: %fx%f\n", tex_size.x, tex_size.y);
         SDL_PropertiesID props = SDL_GetTextureProperties(backBuffer);
         texture_number = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_NUMBER, -1);
+        printf("texture number: %i\n", texture_number);
         int access = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_ACCESS_NUMBER, -1);
+        nose = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_TARGET_NUMBER, -1);
+        printf("texture target number: %i\n", nose);
+
         if (access != SDL_TEXTUREACCESS_TARGET)
         {
             std::cout << "ERROR FATAL: La textura per al render ha de tindre SDL_TEXTUREACCESS_TARGET definit." << std::endl;
@@ -173,23 +178,33 @@ namespace shader
         return true;
     }
 
+    unsigned char pixels[512*240*4];
+
     void render()
     {
-        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+        SDL_FlushRenderer(renderer);
         SDL_SetRenderTarget(renderer, NULL);
+        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
         SDL_RenderClear(renderer);
+        SDL_FlushRenderer(renderer);
 
         if (usingOpenGL)
         {
-            glBindTexture(GL_TEXTURE_2D, texture_number);
-
             GLint oldProgramId;
             if (programId != 0)
             {
                 glGetIntegerv(GL_CURRENT_PROGRAM, &oldProgramId);
                 glUseProgram(programId);
             }
-            
+
+            glEnable(GL_TEXTURE_2D);
+            glActiveTexture(GL_TEXTURE0);
+            glBindTexture(GL_TEXTURE_2D, 1);
+            //glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, pixels);
+            //if (glGetError()) { printf("GLGETERROR!\n"); exit(1);}
+            //GLint param;
+            //glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &param);
+            //printf("tex width: %i\n", param);
             glViewport(0, 0, win_size.x, win_size.y);
 
             glBegin(GL_TRIANGLE_STRIP);
@@ -211,5 +226,6 @@ namespace shader
             SDL_RenderTexture(renderer, backBuffer, NULL, NULL);
             SDL_RenderPresent(renderer);
         }
+        if (glGetError()) { printf("GLERROR!\n"); exit(1); }
     }
 }