Fixed some issues with texture atlas, page and ID generation. Texture references generally seem to be in order now, but UVs are still a problem.

main.cpp

@@ -124,7 +124,7 @@ int process_faces(const world_t* world, const std::vector<ps1bsp_texture_t>& tex
 		outFace.planeId = face->plane_id;
 		outFace.side = face->side;
 		outFace.firstFaceVertex = (unsigned short)outFaceVertices.size();
-		outFace.textureId = (unsigned char)face->texinfo_id;
+		outFace.textureId = (unsigned char)texinfo->texture_id;
 
 		// Traverse the list of face edges to collect all of the face's vertices
 		Vec3 vertexSum;
@@ -140,19 +140,19 @@ int process_faces(const world_t* world, const std::vector<ps1bsp_texture_t>& tex
 			const vertex_t* vertex = &world->vertices[vertIndex];
 			Vec3 vertexPoint = vertex->toVec();
 
-			ps1bsp_facevertex_t faceVertex;
+			ps1bsp_facevertex_t faceVertex = { 0 };
 			faceVertex.index = vertIndex;
 			faceVertex.light = 0;
-			outFaceVertices.push_back(faceVertex);
 
 			// Calculate texture UVs
 			float s = (vertexPoint.dotProduct(texinfo->vectorS) + texinfo->distS) / miptex->width;
 			float t = (vertexPoint.dotProduct(texinfo->vectorT) + texinfo->distT) / miptex->height;
-			while (s > 1) s -= 1; while (s < 0) s += 1;		// TODO: this is a nasty fudge to deal with the lack of texture tiling on PS1 hardware
-			while (t > 1) t -= 1; while (t < 0) t += 1;		// We'll need to break up the faces and manually tile I guess...
+
 			// Rescale the UVs to the dimensions of the mipmap we've selected for our texture atlas
-			faceVertex.u = (unsigned char)(s * ps1tex.w);
-			faceVertex.v = (unsigned char)(t * ps1tex.h);
+			faceVertex.u = (unsigned char)(fmodf(s * ps1tex.w, ps1tex.w));	// TODO: fmodf is a nasty fudge to deal with the lack of texture tiling on PS1 hardware
+			faceVertex.v = (unsigned char)(fmodf(t * ps1tex.h, ps1tex.h));	// We'll need to break up the faces and manually tile I guess...
+
+			outFaceVertices.push_back(faceVertex);
 
 			// Calculate bounding box of this face
 			if (edgeListIdx == 0)

ps1bsp.h

@@ -42,8 +42,8 @@ typedef struct
 typedef struct
 {
 	unsigned char w, h;			// These may be necessary for scaling UVs, especially since we use a mix of mip0 and mip1 textures
-	unsigned short tpage;		// Texture page in PS1 VRAM (precalculated when generating the texture atlas)
 	unsigned char uoffs, voffs;	// Texture coordinate offset within the texture page
+	unsigned short tpage;		// Texture page in PS1 VRAM (precalculated when generating the texture atlas)
 	unsigned short nextframe;	// If non-zero, the texture is animated and this points to the next texture in the sequence
 } ps1bsp_texture_t;
 

texture.cpp

@@ -49,7 +49,7 @@ bool process_textures(const world_t* world, std::vector<ps1bsp_texture_t>& outTe
 		if (strcmp(miptex->name, "clip") && strcmp(miptex->name, "trigger"))
 			rectangles.emplace_back(rectpack2D::rect_xywh(0, 0, miptex->width >> ps1mip, miptex->height >> ps1mip));
 		else
-			rectangles.emplace_back(rectpack2D::rect_xywh(0, 0, 0, 0));
+			rectangles.emplace_back(rectpack2D::rect_xywh(0, 0, miptex->width >> 3, miptex->width >> 3));	// Add the lowest mip level so that it at least gets included in the final texture list, and we don't mess up the texture IDs
 	}
 
 	// Automatic atlas packing. Nice but it tries to make a square atlas which is not what we want. (This is solved by hacking the header itself)
@@ -110,27 +110,29 @@ bool process_textures(const world_t* world, std::vector<ps1bsp_texture_t>& outTe
 				}
 
 				ps1bsp_texture_t ps1tex = { 0 };
-				ps1tex.w = (u_char)miptex->width;
-				ps1tex.h = (u_char)miptex->height;
+				ps1tex.w = (u_char)rectangle.w;
+				ps1tex.h = (u_char)rectangle.h;
 				
-				u_short x = rectangle.x + 512;
-				u_short y = rectangle.y + 256;
-
 				// prect is derived from the texture's position inside the atlas (rectangle.x/y) and the planned position of the atlas in VRAM (512, 256)
 				// mode is always 1 (8-bit palletized)
 				//texture->uoffs = (texture->prect.x % 64) << (2 - (texture->mode & 0x3));
 				//texture->voffs = (texture->prect.y & 0xFF);
 
+				u_short x = (rectangle.x / 2) + 512;	// Divide by 2 to get the coordinate in 16-bit pixel units
+				u_short y = rectangle.y + 256;
+
 				/*
 				tp specifies the color depth for the texture page in the range of 0 to 2 (0:4-bit, 1:8-bit, 2:16-bit). 
 				abr specifies the blend operator for both non-textured and textured semi-transparent primitives which can be ignored for now and lastly, 
 				x,y specifies the X,Y coordinates of the VRAM in 16-bit pixel units. 
 				Keep in mind that the coordinates will be rounded down to the next lowest texture page. */
 				
-				ps1tex.tpage = getTPage(1, 0, x, y);
-				ps1tex.uoffs = (u_char)((x % 64) << 1);
+				const int mode = 1;	// 8-bit per pixel, all Quake textures use this
+				ps1tex.tpage = getTPage(mode, 0, x, y);
+				ps1tex.uoffs = (u_char)((x % 64) << (2 - mode));
 				ps1tex.voffs = (u_char)(y & 0xFF);
 				// TODO: animated textures
+
 				outTextures.push_back(ps1tex);
 			}
 		}