Explosions in the DS2 mission now default to procedural explosions.

MechDonald's new explosions are great, but they are also a bit big and long. So,
in the DS2 mission, these explosions may obscure the tunnel. In this commit, we
check if the mission is the DS2 tunnel, and if so, we remove regular explosions
and turn them all into procedural explosions.

To turn off this feature, add the following setting to SSAO.cfg:

DS2_force_procedural_explosions = 0

Of course, setting it to 1 (or removing it), will enable it again.

impl11/Materials/dat-2000.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 18
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 24
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2001.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 18
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 21
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2002.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 21
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 16
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2003.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 26
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 24
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2004.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 16
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 24
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2005.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 18
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 24
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/Materials/dat-2006.mat

@@ -1,4 +1,6 @@
 [Default]
-TotalFrames = 47
-ExplosionBlendMode = 1
+; MechDonald's explosions are great, but for the DSII mission they might be a
+; bit long, so here I'm going to use half the frames they actually have
+TotalFrames = 27
+ExplosionBlendMode = 0
 ExplosionScale = 3.5

impl11/ddraw/Direct3DDevice.cpp

@@ -473,6 +473,8 @@ bool g_bResetDC = false;
 
 // DS2 Effects
 int g_iReactorExplosionCount = 0;
+// Replace regular explosions with procedural explosions during the DS2 mission to improve visibility.
+bool g_bDS2ForceProceduralExplosions = true;
 
 /*********************************************************/
 // High Resolution Timers
@@ -4514,7 +4516,12 @@ HRESULT Direct3DDevice::Execute(
 				}
 
 				// Render the procedural explosions
-				if (bIsExplosion && bHasMaterial && lastTextureSelected->material.ExplosionBlendMode > 0)
+				if (bIsExplosion && bHasMaterial &&
+					(lastTextureSelected->material.ExplosionBlendMode > 0 ||
+					// The newest explosions by MechDonald are bigger and longer. Unfortunately, during the DS2 mission, this can
+					// block a lot of visibility in the tunnel. So if we're in the DS2 mission, let's use procedural explosions
+					// instead.
+					(g_bDS2ForceProceduralExplosions && *missionIndexLoaded == DEATH_STAR_MISSION_INDEX)))
 				{
 					static float iTime = 0.0f;
 					//iTime += 0.05f;

impl11/ddraw/Materials.h

@@ -347,7 +347,9 @@ typedef struct MaterialStruct {
 		TotalFrames	= 0;
 		ExplosionScale = 2.0f; // 2.0f is the original scale
 		ExplosionSpeed = 0.001f;
-		ExplosionBlendMode = 1; // 0: Original texture, 1: Blend with procedural explosion, 2: Use procedural explosions only
+		// MechDonald's explosions are so good that we probably want to default to using them
+		// now (instead of blending them with a procedural explosion)
+		ExplosionBlendMode = 0; // 0: Original texture, 1: Blend with procedural explosion, 2: Use procedural explosions only
 
 		DATGroupImageIdParsed = false;
 		GroupId = 0;

impl11/ddraw/VRConfig.cpp

@@ -2283,6 +2283,10 @@ bool LoadSSAOParams() {
 			if (_stricmp(param, "star_debug_enabled") == 0) {
 				g_bStarDebugEnabled = (bool)fValue;
 			}
+
+			if (_stricmp(param, "DS2_force_procedural_explosions") == 0) {
+				g_bDS2ForceProceduralExplosions = (bool)fValue;
+			}
 		}
 	}
 	fclose(file);

impl11/ddraw/globals.h

@@ -77,6 +77,7 @@ extern HiResTimer g_HiResTimer;
 
 // DS2 Effects
 extern int g_iReactorExplosionCount;
+extern bool g_bDS2ForceProceduralExplosions;