1 files changed, 119 insertions, 0 deletions
diff --git a/matchblox/engine/C_Environment.cpp b/matchblox/engine/C_Environment.cpp
new file mode 100644
index 0000000..0c7cbfd
--- /dev/null
+++ b/matchblox/engine/C_Environment.cpp
@@ -0,0 +1,119 @@
+#include <GL/glut.h>
+#include <string>
+#include <iostream>
+
+#include "bitmap.h"
+#include "C_Environment.h"
+
+#ifndef GL_CLAMP_TO_EDGE
+#define GL_CLAMP_TO_EDGE 0x812F
+#endif  //GL_CLAMP_TO_EDGE
+
+using namespace std;
+
+C_Environment::C_Environment(const char *f_strEnvMapBaseName,
+                double f_dDistance)
+  : m_dDist(f_dDistance)
+{
+  string       l_strBase = f_strEnvMapBaseName,
+               l_strFilename;
+  const char   *l_suffix[] = { "negative_x.bmp",
+                               "negative_y.bmp",
+                               "negative_z.bmp",
+                               "positive_x.bmp",
+                               "positive_y.bmp",
+                               "positive_z.bmp"
+                             };
+
+  BitmapStruct l_bmp;
+
+  //load textures
+  for (int i=0; i<6; i++)
+  {
+    l_strFilename = l_strBase + l_suffix[i];
+    l_bmp = BitmapLoad((char*)l_strFilename.c_str());
+    m_uiFaceTex[i] = (GLuint)l_bmp.m_iImageId;
+   
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+  }
+}
+
+C_Environment::~C_Environment()
+{
+  glDeleteTextures(6, m_uiFaceTex);
+}
+
+void C_Environment::Render()
+{
+  double l_Vertices[8][3] = 
+     { { -m_dDist, -m_dDist,  m_dDist },
+       {  m_dDist, -m_dDist,  m_dDist },
+       {  m_dDist, -m_dDist, -m_dDist },
+       { -m_dDist, -m_dDist, -m_dDist },
+       { -m_dDist,  m_dDist,  m_dDist },
+       {  m_dDist,  m_dDist,  m_dDist },
+       {  m_dDist,  m_dDist, -m_dDist },
+       { -m_dDist,  m_dDist, -m_dDist } };
+
+  
+  //init render settings for rendering of the environment
+  //mapped cube
+  
+  glPushAttrib(GL_TEXTURE_BIT | GL_ENABLE_BIT);
+
+  //no lighting
+  glDisable(GL_LIGHTING);
+  //enable texturing
+  glEnable(GL_TEXTURE_2D);
+  glTexEnvf(GL_TEXTURE_2D, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+    //neg x (left)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[0]);
+  RenderFace(l_Vertices, 3, 0, 4, 7); 
+  
+  //neg y (down)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[1]);
+  RenderFace(l_Vertices, 3, 2, 1, 0);
+
+  //nez z (front)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[2]);
+  RenderFace(l_Vertices, 2, 3, 7, 6);
+
+  //pos x (right)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[3]);
+  RenderFace(l_Vertices, 1, 2, 6, 5);
+
+  //pos y (top)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[4]);
+  RenderFace(l_Vertices, 4, 5, 6, 7);
+
+  //pos z (back)
+  glBindTexture(GL_TEXTURE_2D, m_uiFaceTex[5]);
+  RenderFace(l_Vertices, 0, 1, 5, 4);
+
+  glPopAttrib();
+}
+
+void C_Environment::RenderFace(double f_verts[8][3], 
+                               int f_v00, int f_v10, 
+                               int f_v11, int f_v01)
+{
+  //render textured quad in counter clockwise order
+  glBegin(GL_QUADS);
+    glTexCoord2i(0,0);
+    glVertex3dv(f_verts[f_v00]);
+
+    glTexCoord2i(1,0);
+    glVertex3dv(f_verts[f_v10]);
+
+    glTexCoord2i(1,1);
+    glVertex3dv(f_verts[f_v11]);
+
+    glTexCoord2i(0,1);
+    glVertex3dv(f_verts[f_v01]);
+  glEnd();
+  
+}