test_texmem

panda/src/testbed/test_texmem.cxx

@@ -19,6 +19,8 @@
 #include "pandaFramework.h"
 #include "geomQuad.h"
 #include "textureAttrib.h"
+#include "cmath.h"
+#include "mathNumbers.h"
 
 NodePath bogus_scene;
 
@@ -56,17 +58,34 @@ event_T(CPT_Event, void *data) {
   GeomNode *gnode = new GeomNode("quads");
   bogus_scene.attach_new_node(gnode);
 
+  PNMImage white_center(tex_x_size / 4, tex_y_size / 4);
+  white_center.fill(1.0f, 1.0f, 1.0f);
+
   PTA_Colorf colors;
   colors.push_back(Colorf(1.0f, 1.0f, 1.0f, 1.0f));
   for (int yi = 0; yi < num_quads_side; yi++) {
     float y0 = (float)yi / (float)num_quads_side;
     float y1 = (float)(yi + 1) / (float)num_quads_side;
+
+    // Map the x, y vertices onto a sphere just for fun.
+    float px0 = ccos((y0 - 0.5f) * MathNumbers::pi_f);
+    float px1 = ccos((y1 - 0.5f) * MathNumbers::pi_f);
+    float py0 = csin((y0 - 0.5f) * MathNumbers::pi_f);
+    float py1 = csin((y1 - 0.5f) * MathNumbers::pi_f);
     for (int xi = 0; xi < num_quads_side; xi++) {
       float x0 = (float)xi / (float)num_quads_side;
       float x1 = (float)(xi + 1) / (float)num_quads_side;
 
+      float hx0 = ccos(x0 * MathNumbers::pi_f * 2.0f);
+      float hx1 = ccos(x1 * MathNumbers::pi_f * 2.0f);
+      float hy0 = csin(x0 * MathNumbers::pi_f * 2.0f);
+      float hy1 = csin(x1 * MathNumbers::pi_f * 2.0f);
+
       PNMImage bogus_image(tex_x_size, tex_y_size);
       bogus_image.fill(x0, (xi + yi) & 1, y0);
+      bogus_image.copy_sub_image(white_center,
+                                 (tex_x_size - white_center.get_x_size()) / 2,
+                                 (tex_y_size - white_center.get_y_size()) / 2);
       
       PT(Texture) tex = new Texture;
       tex->set_minfilter(Texture::FT_linear_mipmap_linear);
@@ -74,10 +93,10 @@ event_T(CPT_Event, void *data) {
 
       PTA_Vertexf coords;
       PTA_TexCoordf uvs;
-      coords.push_back(Vertexf(x0, 0.0f, y0));
-      coords.push_back(Vertexf(x1, 0.0f, y0));
-      coords.push_back(Vertexf(x1, 0.0f, y1));
-      coords.push_back(Vertexf(x0, 0.0f, y1));
+      coords.push_back(Vertexf(hx0 * px0, hy0 * px0, py0));
+      coords.push_back(Vertexf(hx1 * px0, hy1 * px0, py0));
+      coords.push_back(Vertexf(hx1 * px1, hy1 * px1, py1));
+      coords.push_back(Vertexf(hx0 * px1, hy0 * px1, py1));
       uvs.push_back(TexCoordf(0.0f, 0.0f));
       uvs.push_back(TexCoordf(1.0f, 0.0f));
       uvs.push_back(TexCoordf(1.0f, 1.0f));
@@ -91,7 +110,6 @@ event_T(CPT_Event, void *data) {
       gnode->add_geom(quad, RenderState::make(TextureAttrib::make(tex)));
     }
   }
-
   cerr << "Done.\n";
 }