Clip polygons that are too close to the camera, and increased the analog stick deadzone a bit.

main.c

@@ -43,6 +43,7 @@ int db;
 
 u_long ot[2][OTLEN];	// Ordering tables, two arrays for double buffering. These are basically the buckets for bucket sorting of polygons.
 						// You can also see them as "layers" in the modern 3D graphics sense, but they serve a more immediate role for polygon ordering.
+						// Layer 0 is free for overlays, as polygons at depth 0 will be clipped.
 char primbuff[2][65536];	// Primitive buffer, just a raw buffer of bytes to use as a pool for primitives
 char *nextpri;
 
@@ -96,6 +97,7 @@ const MATRIX identity = {
 	0, 0, 0,
 };
 
+// Transform to change the coordinate system from PS1 Default (Y down, Z forward) to Quake (Z up, Y forward)
 const MATRIX quake_swizzle = {
 	ONE, 0, 0,
 	0, 0, -ONE,
@@ -446,9 +448,13 @@ void drawModel(MATRIX *view_matrix, ps1mdl_t *model, ps1skin_t *skin, int frameC
 	{
 		ps1mdl_triangle_t *tri = &model->triangles[triIdx];
 
-		SVECTOR *v0 = &vertexBuffer[tri->vertexIndex[0]];
-		SVECTOR *v1 = &vertexBuffer[tri->vertexIndex[1]];
-		SVECTOR *v2 = &vertexBuffer[tri->vertexIndex[2]];
+		unsigned short i0 = tri->vertexIndex[0];
+		unsigned short i1 = tri->vertexIndex[1];
+		unsigned short i2 = tri->vertexIndex[2];
+		
+		SVECTOR *v0 = &vertexBuffer[i0];
+		SVECTOR *v1 = &vertexBuffer[i1];
+		SVECTOR *v2 = &vertexBuffer[i2];
 
 		gte_ldv3(v0, v1, v2);
 		gte_rtpt();	// Rotation, Translation and Perspective triplet (all three vertices at once)
@@ -463,12 +469,12 @@ void drawModel(MATRIX *view_matrix, ps1mdl_t *model, ps1skin_t *skin, int frameC
 		gte_avsz3();
 		gte_stotz(&p);
 		unsigned short depth = p;//p >> 2;
-		if (depth < 0 || depth >= OTLEN)
+		if (depth <= 0 || depth >= OTLEN)
 			continue;
 
-		ps1mdl_texcoord_t *tc0 = &model->texCoords[tri->vertexIndex[0]];
-		ps1mdl_texcoord_t *tc1 = &model->texCoords[tri->vertexIndex[1]];
-		ps1mdl_texcoord_t *tc2 = &model->texCoords[tri->vertexIndex[2]];
+		ps1mdl_texcoord_t *tc0 = &model->texCoords[i0];
+		ps1mdl_texcoord_t *tc1 = &model->texCoords[i1];
+		ps1mdl_texcoord_t *tc2 = &model->texCoords[i2];
 
 		if (tri->frontFace)
 		{
@@ -533,8 +539,8 @@ void drawStuff(int counter)
 	ScaleMatrixL(&proj_matrix, &aspect_scale);	// Apply aspect ratio correction for the current resolution
 
 	MATRIX view_matrix;
-	SVECTOR trot = { -cam_rot.vx, -cam_rot.vy, -cam_rot.vz, 0 };	// inverse camera rotation (in Quake coordinates)
-	VECTOR tpos = { -cam_pos.vx, -cam_pos.vy, -cam_pos.vz };		// inverse camera position (in Quake coordinates)
+	SVECTOR trot = { -cam_rot.vx, -cam_rot.vy, -cam_rot.vz, 0 };	// Inverse camera rotation (in Quake coordinates)
+	VECTOR tpos = { -cam_pos.vx, -cam_pos.vy, -cam_pos.vz };		// Inverse camera position (in Quake coordinates)
 	RotMatrix(&trot, &view_matrix);		// Set camera rotation part of the view matrix
 	ApplyMatrixLV(&view_matrix, &tpos, &tpos);	// Apply camera rotation to camera position
 	TransMatrix(&view_matrix, &tpos);	// Apply transformed position to the translation part of the view matrix
@@ -552,6 +558,7 @@ void handleInput()
 {
 	const int moveSpeed = 32;
 	const short rotSpeed = 32;
+	const char deadZone = 0x30;
 
 	// Check if we have a connected controller on port 1
 	if (padBuffer[0][0] != 0)
@@ -630,13 +637,13 @@ void handleInput()
 	if (padType == 0x5 || padType == 0x7)
 	{
 		short rightJoyX = (short)(padBuffer[0][4]) - 0x80;
-		if (rightJoyX > -0x20 && rightJoyX < 0x20) rightJoyX = 0;
+		if (rightJoyX > -deadZone && rightJoyX < deadZone) rightJoyX = 0;
 		short rightJoyY = (short)(padBuffer[0][5]) - 0x80;
-		if (rightJoyY > -0x20 && rightJoyY < 0x20) rightJoyY = 0;
+		if (rightJoyY > -deadZone && rightJoyY < deadZone) rightJoyY = 0;
 		short leftJoyX = (short)(padBuffer[0][6]) - 0x80;
-		if (leftJoyX > -0x20 && leftJoyX < 0x20) leftJoyX = 0;
+		if (leftJoyX > -deadZone && leftJoyX < deadZone) leftJoyX = 0;
 		short leftJoyY = (short)(padBuffer[0][7]) - 0x80;
-		if (leftJoyY > -0x20 && leftJoyY < 0x20) leftJoyY = 0;
+		if (leftJoyY > -deadZone && leftJoyY < deadZone) leftJoyY = 0;
 
 		// Move forward/backward
 		cam_pos.vx -= (cam_mtx.m[0][1] * leftJoyY * moveSpeed) >> 19;