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Added new test to raw demos

--- a/Raw_Demos/gears.c

+++ b/Raw_Demos/gears.c

@@ -441,6 +441,15 @@

 	glDeleteList(gear1);

 	glDeleteList(gear2);

 	glDeleteList(gear3);

+	//ZB_close(frameBuffer);

+	glClose();

+	glInit(frameBuffer);

+	glClose();

+	glInit(frameBuffer);

+	glClose();

+	glInit(frameBuffer);

+	glClose();

+	glInit(frameBuffer);

 	ZB_close(frameBuffer);

 	glClose();

 	return 0;

--- a/src/init.c

+++ b/src/init.c

@@ -1,6 +1,7 @@

 #include "zgl.h"

 #include "msghandling.h"

 GLContext gl_ctx;

+const GLContext empty_gl_ctx = {0};

 void initSharedState(GLContext* c) {

 	GLSharedState* s = &c->shared_state;

@@ -40,10 +41,6 @@

 		t = s->texture_hash_table[i];

 		while (t) {

 			GLTexture** ht;

-			//GLImage* im;

-			//GLint inner_i;

-

-			// t = find_texture(c, h);

 			if (t->prev == NULL) {

 				ht = &c->shared_state.texture_hash_table[t->handle & TEXTURE_HASH_TABLE_MASK];

 				*ht = t->next;

@@ -53,12 +50,6 @@

 			n = t->next;

 			if (t->next != NULL)

 				t->next->prev = t->prev;

-

-			//for (inner_i = 0; inner_i < MAX_TEXTURE_LEVELS; inner_i++) {

-			//	im = &t->images[inner_i];

-			//	if (im->pixmap != NULL)

-			//		gl_free(im->pixmap);

-			//}

 			gl_free(t);

 			t = n;

 		}

@@ -143,6 +134,7 @@

 	if(TinyGLRuntimeCompatibilityTest()) gl_fatal_error("TINYGL_FAILED_RUNTIME_COMPAT_TEST");

 #endif

 	//c = gl_zalloc(sizeof(GLContext));

+	gl_ctx = empty_gl_ctx;

 	c = &gl_ctx;

 	if(!c) gl_fatal_error("TINYGL_CANNOT_INIT_OOM");

 	//gl_ctx = c;