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Added comment and Macro control in render routines (a.c)

--- a/Engine/src/a.c

+++ b/Engine/src/a.c

@@ -10,13 +10,8 @@

 #include "platform.h"

 #include "build.h"

-//FCS: In order to see how the engine renders different part of the screen you can set the following macros

-//VISUALIZE RENDERER

-#define RENDER_DRAW_WALL_BORDERS 1

-#define RENDER_DRAW_WALL_INSIDE 1

-#define RENDER_DRAW_CEILING_AND_FLOOR 1

-//END VISUALIZE RENDERER

+

 #define shrd(a,b,c) (((b)<<(32-(c))) | ((a)>>(c)))

 #define shld(a,b,c) (((b)>>(32-(c))) | ((a)<<(c)))

@@ -51,6 +46,7 @@

 void setuphlineasm4(long i1, long i2) { }

 void setpalookupaddress(unsigned char *i1) { pal_eax = i1; }

+//FCS:   Draw ceiling/floors

 void hlineasm4(long _count, unsigned long unused_source, long _shade, unsigned long _i4, unsigned long _i5, long i6)

 {

     /* force into registers (probably only useful on PowerPC)... */

@@ -67,6 +63,9 @@

     register long _asm1 = asm1;

     register long _asm2 = asm2;

+	if (!RENDER_DRAW_CEILING_AND_FLOOR)

+		return;

+

     while (count) {

 	    source = i5 >> shifter;

 	    source = shld(source,i4,bits);

@@ -93,6 +92,7 @@

     rmach_esi = i5;

 } /* setuprhlineasm4 */

+

 void rhlineasm4(long i1, long i2, long i3, unsigned long i4, unsigned long i5, long i6)

 {

     unsigned long ebp = i6 - i1;

@@ -131,6 +131,7 @@

 } /* setuprmhlineasm4 */

 /* #pragma aux rmhlineasm4 parm [eax][ebx][ecx][edx][esi][edi] */

+//FCS: ????

 void rmhlineasm4(long i1, long i2, long i3, long i4, long i5, long i6)

 {

     unsigned long ebp = i6 - i1;

@@ -188,21 +189,24 @@

 /* #pragma aux prevlineasm1 parm [eax][ebx][ecx][edx][esi][edi] */

 static unsigned char mach3_al;

+

+//FCS:  RENDER TOP AND BOTTOM COLUMN

 long prevlineasm1(long i1, long i2, long i3, long i4, long i5, long i6)

 {

     unsigned char *source = (unsigned char *)i5;

     unsigned char *dest = (unsigned char *)i6;

+

+	

+

     if (i3 == 0)

     {

+		if (!RENDER_DRAW_TOP_AND_BOTTOM_COLUMN)

+		return;

+

 	    i1 += i4;

-        

         //FCS

         //((unsigned long)i4) >>= mach3_al;

         i4 = ((unsigned long)i4) >> mach3_al;

-        //unsigned long tmp = i4;

-	    //tmp >>= mach3_al;

-        //i4 = tmp;

-        

 	    i4 = (i4&0xffffff00) | (source[i4]&0xff);

 	    *dest = ((unsigned char*)i2)[i4];

 	    return i1;

@@ -215,12 +219,15 @@

 //extern unsigned char * get_framebuffer(void);

 /* #pragma aux vlineasm1 parm [eax][ebx][ecx][edx][esi][edi] */

+//FCS: This is used to draw wall border vertical lines

 long vlineasm1(long vince, long palookupoffse, long i3, long vplce, long bufplce, long i6)

 {

     unsigned long temp;

     unsigned char *dest = (unsigned char *)i6;

-    

+    if (!RENDER_DRAW_WALL_BORDERS)

+		return;

+

     i3++;

     while (i3)

     {

@@ -412,8 +419,14 @@

 #endif

 /* #pragma aux vlineasm4 parm [ecx][edi] modify [eax ebx ecx edx esi edi] */

+//FCS This is used to fill the inside of a wall

 void vlineasm4(long i1, long i2)

 {

+

+	

+	if (!RENDER_DRAW_WALL_INSIDE)

+		return ;

+

 #if HAVE_POWERPC

     if (has_altivec)

         vlineasm4_altivec(i1, i2);

@@ -450,6 +463,7 @@

     unsigned long temp;

     unsigned long index = (i2 + ylookup[i1]);

     unsigned char *dest = (unsigned char*)(-ylookup[i1]);

+

     do {

         for (i = 0; i < 4; i++)

         {

@@ -720,6 +734,7 @@

 #define high32(a) ((int)(((__int64)a&(__int64)0xffffffff00000000)>>32))

 /* #pragma aux slopevlin parm [eax][ebx][ecx][edx][esi][edi] */

+//FCS: Render RENDER_SLOPPED_CEILING_AND_FLOOR

 void slopevlin(long i1, unsigned long i2, long i3, long i4, long i5, long i6)

 {

     bitwisef2i c;

@@ -729,6 +744,10 @@

     esi = i5 + low32((__int64)globalx3 * (__int64)(i2<<3));

     edi = i6 + low32((__int64)globaly3 * (__int64)(i2<<3));

     ebx = i4;

+

+	if (!RENDER_SLOPPED_CEILING_AND_FLOOR)

+		return;

+

     do {

 	    // -------------

 	    // All this is calculating a fixed point approx. of 1/a

--- a/Engine/src/build.h

+++ b/Engine/src/build.h

@@ -308,6 +308,20 @@

 #define PORTSIG  "Port by Ryan C. Gordon, Andrew Henderson, Dan Olson, and a cast of thousands."

+

+//FCS: In order to see how the engine renders different part of the screen you can set the following macros

+//VISUALIZE RENDERER

+#define RENDER_DRAW_WALL_BORDERS 0

+#define RENDER_DRAW_WALL_INSIDE 0

+#define RENDER_DRAW_CEILING_AND_FLOOR 0

+#define RENDER_DRAW_TOP_AND_BOTTOM_COLUMN 1

+#define RENDER_SLOPPED_CEILING_AND_FLOOR 0

+

+#if RENDER_DRAW_WALL_BORDERS || RENDER_DRAW_WALL_INSIDE || RENDER_DRAW_CEILING_AND_FLOOR || RENDER_DRAW_TOP_AND_BOTTOM_COLUMN || RENDER_SLOPPED_CEILING_AND_FLOOR

+#define CLEAR_FRAMEBUFFER 1

+#endif

+//END VISUALIZE RENDERER

+

 #endif  /* defined _INCLUDE_BUILD_H_ */

 /* end of build.h ... */

--- a/Engine/src/sdl_driver.c

+++ b/Engine/src/sdl_driver.c

@@ -1940,6 +1940,12 @@

 		// FIX_00085: Optimized Video driver. FPS increases by +20%.

         // SDL_Flip(surface);

 		SDL_UpdateRect(surface, 0, 0, 0, 0);

+

+		// When visualizing the rendering process, part of the screen

+		// are not updated: In order to avoid the "ghost effect", we

+		// clear the framebuffer to black.

+		if (CLEAR_FRAMEBUFFER)

+			SDL_FillRect(surface,0,0);

     }

 #ifdef USE_OPENGL