From 1a62fd07f794e8e8efe63d97ae2a6fba09d5e82c Mon Sep 17 00:00:00 2001
From: Allanis <allanis.saracraft.studios@gmail.com>
Date: Sat, 3 Feb 2018 20:37:32 +0000
Subject: [PATCH] [Add] Nicer collision mesh viewing in model viewer.

---
 src/sbre_viewer.cpp | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/src/sbre_viewer.cpp b/src/sbre_viewer.cpp
index f096667..5d8789c 100644
--- a/src/sbre_viewer.cpp
+++ b/src/sbre_viewer.cpp
@@ -9,6 +9,7 @@ static int g_mouseMotion[2];
 static char g_keyState[SDLK_LAST];
 static int g_mouseButton[5];
 static int g_model = 0; /* sbre model number. Set with argc. */
+static float g_zbias;
 
 
 static void PollEvents(void) {
@@ -127,6 +128,30 @@ public:
   void MainLoop();
 };
 
+static void render_coll_mesh(const CollMesh* m) {
+  glDisable(GL_LIGHTING);
+  glColor3f(1, 0, 1);
+  glBegin(GL_TRIANGLES);
+  glDepthRange(0.0+g_zbias, 1.0);
+  for(int i = 0; i < m->ni; i += 3) {
+    glVertex3fv(&m->pVertex[3*m->pIndex[i+1]]);
+    glVertex3fv(&m->pVertex[3*m->pIndex[i]]);
+    glVertex3fv(&m->pVertex[3*m->pIndex[i+2]]);
+  }
+  glEnd();
+  glColor3f(1, 1, 1);
+  glDepthRange(0, 1.0f-g_zbias);
+  for(int i = 0; i < m->ni; i += 3) {
+    glBegin(GL_LINE_LOOP);
+    glVertex3fv(&m->pVertex[3*m->pIndex[i]]);
+    glVertex3fv(&m->pVertex[3*m->pIndex[i+1]]);
+    glVertex3fv(&m->pVertex[3*m->pIndex[i+2]]);
+    glEnd();
+  }
+  glDepthRange(0, 1);
+  glEnable(GL_LIGHTING);
+}
+
 void Viewer::MainLoop(void) {
   matrix4x4d rot = matrix4x4d::Identity();
   float distance = 100;
@@ -171,7 +196,14 @@ void Viewer::MainLoop(void) {
     m.y1 = rot[1]; m.y2 = rot[5]; m.y3 = rot[ 9];
     m.z1 = rot[2]; m.z2 = rot[6]; m.z3 = rot[10];
     p.x = 0; p.y = 0; p.z = distance;
-    if(g_renderCollMesh) sbreRenderCollMesh(cmesh, &p, &m);
+    if(g_renderCollMesh) {
+      glPushMatrix();
+      glTranslatef(p.x, p.y, p.z);
+      glMultMatrixd(&rot[0]);
+      render_coll_mesh(cmesh);
+      glPopMatrix();
+      //sbreRenderCollMesh(cmesh, &p, &m);
+    }
     else sbreRenderModel(&p, &m, g_model, &params);
     glPopAttrib();
 
@@ -212,7 +244,8 @@ int main(int argc, char** argv) {
   SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,      8);
   SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,    24);
   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,   1);
-  sbreSetZBias(2.0/(1<<24));
+  g_zbias = 2.0/(1<<24);
+  sbreSetZBias(g_zbias);
   
   Uint32 flags = SDL_OPENGL;
 
@@ -222,7 +255,8 @@ int main(int argc, char** argv) {
     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,     6);
     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,      5);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,    16);
-    sbreSetZBias(2.0/(1<<16));
+    g_zbias = 2.0/(1<<16);
+    sbreSetZBias(g_zbias);
     fprintf(stderr, "Failed to set video mode. (%s). Re-trying with 16-bit depth buffer.\n", SDL_GetError());
     if((g_screen = SDL_SetVideoMode(g_width, g_height, info->vfmt->BitsPerPixel, flags)) == 0) {
       fprintf(stderr, "Video mode set failed: %s\n", SDL_GetError());