Alter fog depth to deal with new near plane value

src/game/camera.c

@@ -11802,12 +11802,6 @@ void rom_hack_cam_walk(Vec3f pos, Vec3f dir, f32 dist) {
         return;
     }
 
-    Vec3f prevPos = {
-        pos[0],
-        pos[1],
-        pos[2],
-    };
-
     // figure out dir normal
     Vec3f dirNorm;
     vec3f_copy(dirNorm, dir);

src/game/rendering_graph_node.c

@@ -42,7 +42,9 @@
 
 #define MATRIX_STACK_SIZE 32
 
-#define MAX_PROJECTION_NEAR_VALUE 5
+f32 gProjectionMaxNearValue = 5;
+s16 gProjectionVanillaNearValue = 100;
+s16 gProjectionVanillaFarValue = 1000;
 
 s16 gMatStackIndex;
 Mat4 gMatStack[MATRIX_STACK_SIZE] = {};
@@ -224,7 +226,7 @@ void patch_mtx_interpolated(f32 delta) {
     if (sPerspectiveNode != NULL) {
         u16 perspNorm;
         f32 fovInterpolated = delta_interpolate_f32(sPerspectiveNode->prevFov, sPerspectiveNode->fov, delta);
-        f32 near = MIN(sPerspectiveNode->near, MAX_PROJECTION_NEAR_VALUE);
+        f32 near = MIN(sPerspectiveNode->near, gProjectionMaxNearValue);
         guPerspective(sPerspectiveMtx, &perspNorm, not_zero(fovInterpolated, gOverrideFOV), sPerspectiveAspect, not_zero(near, gOverrideNear), not_zero(sPerspectiveNode->far, gOverrideFar), 1.0f);
         gSPMatrix(sPerspectivePos, VIRTUAL_TO_PHYSICAL(sPerspectiveNode), G_MTX_PROJECTION | G_MTX_LOAD | G_MTX_NOPUSH);
     }
@@ -459,7 +461,9 @@ static void geo_process_perspective(struct GraphNodePerspective *node) {
     f32 aspect = (f32) gCurGraphNodeRoot->width / divisor;
 #endif
 
-    f32 near = MIN(node->near, MAX_PROJECTION_NEAR_VALUE);
+    gProjectionVanillaNearValue = node->near;
+    gProjectionVanillaFarValue = node->far;
+    f32 near = MIN(node->near, gProjectionMaxNearValue);
     guPerspective(mtx, &perspNorm, not_zero(node->prevFov, gOverrideFOV), aspect, not_zero(near, gOverrideNear), not_zero(node->far, gOverrideFar), 1.0f);
 
     sPerspectiveNode = node;

src/game/rendering_graph_node.h

@@ -5,6 +5,10 @@
 
 #include "engine/graph_node.h"
 
+extern f32 gProjectionMaxNearValue;
+extern s16 gProjectionVanillaNearValue;
+extern s16 gProjectionVanillaFarValue;
+
 extern struct GraphNodeRoot *gCurGraphNodeRoot;
 extern struct GraphNodeMasterList *gCurGraphNodeMasterList;
 extern struct GraphNodePerspective *gCurGraphNodeCamFrustum;

src/pc/controller/controller_keyboard_debug.c

@@ -15,8 +15,8 @@
 #include "pc/lua/smlua.h"
 #include "pc/network/socket/socket.h"
 
-
 static bool sHoldingAlt = false;
+static bool sHoldingShift = false;
 
 #define SCANCODE_0 0x0B
 #define SCANCODE_1 0x02
@@ -30,6 +30,7 @@ static bool sHoldingAlt = false;
 #define SCANCODE_9 0x0A
 #define SCANCODE_F5 0x3f
 #define SCANCODE_ALT 0x38
+#define SCANCODE_SHIFT 0x2A
 
 static void debug_breakpoint_here(void) {
     // create easy breakpoint position for debugging
@@ -96,6 +97,7 @@ void debug_keyboard_on_key_down(int scancode) {
     if (gNetworkSystem == &gNetworkSystemSocket) {
         switch (scancode & 0xFF) {
             case SCANCODE_ALT: sHoldingAlt = true; break;
+            case SCANCODE_SHIFT: sHoldingShift = true; break;
             case SCANCODE_3: debug_breakpoint_here(); break;
 #ifdef DEVELOPMENT
             case SCANCODE_1:  if (sHoldingAlt) { debug_warp_level1();  } break;
@@ -114,6 +116,7 @@ void debug_keyboard_on_key_up(int scancode) {
     if (gNetworkSystem == &gNetworkSystemSocket) {
         switch (scancode & 0xFF) {
             case SCANCODE_ALT: sHoldingAlt = false; break;
+            case SCANCODE_SHIFT: sHoldingShift = false; break;
         }
     }
 }

src/pc/gfx/gfx_pc.c

@@ -28,6 +28,8 @@
 
 #include "macros.h"
 
+#include "game/rendering_graph_node.h"
+
 #define SUPPORT_CHECK(x) assert(x)
 
 // SCALE_M_N: upscale/downscale M-bit integer to N-bit
@@ -171,6 +173,10 @@ static size_t buf_vbo_num_tris;
 static struct GfxWindowManagerAPI *gfx_wapi;
 static struct GfxRenderingAPI *gfx_rapi;
 
+static f32 sDepthZAdd = 0;
+static f32 sDepthZMult = 1;
+static f32 sDepthZSub = 0;
+
 // 4x4 pink-black checkerboard texture to indicate missing textures
 #define MISSING_W 4
 #define MISSING_H 4
@@ -866,8 +872,13 @@ static void OPTIMIZE_O3 gfx_sp_vertex(size_t n_vertices, size_t dest_index, cons
             if (winv < 0.0f) {
                 winv = 32767.0f;
             }
-            
+
+            z -= sDepthZSub;
+            z *= sDepthZMult;
+            z += sDepthZAdd;
+
             float fog_z = z * winv * rsp.fog_mul + rsp.fog_offset;
+
             if (fog_z < 0) fog_z = 0;
             if (fog_z > 255) fog_z = 255;
             d->color.a = fog_z; // Use alpha variable to store fog factor
@@ -1182,6 +1193,12 @@ static void gfx_sp_moveword(uint8_t index, UNUSED uint16_t offset, uint32_t data
         case G_MW_FOG:
             rsp.fog_mul = (int16_t)(data >> 16);
             rsp.fog_offset = (int16_t)data;
+
+            // Alter depth buffer to deal with new near plane
+            sDepthZAdd = (gProjectionMaxNearValue - gProjectionVanillaNearValue) + gProjectionMaxNearValue;
+            sDepthZMult = (gProjectionVanillaFarValue - gProjectionMaxNearValue) / (gProjectionVanillaFarValue - gProjectionVanillaNearValue);
+            sDepthZSub = gProjectionVanillaNearValue;
+
             break;
     }
 }