From fd4b6b27c8f85c4f823f3323f0afbf7372c765b5 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Wed, 16 Dec 2009 02:43:15 +0000
Subject: [PATCH] added Engine::Object::setTextureScale() for box and plane
 texture scaling

git-svn-id: svn://anubis/anaglym/trunk@219 99a6e188-d820-4881-8870-2d33a10e2619
---
 Engine.cc      |  9 ++++++---
 Engine.h       |  5 +++++
 ag.cc          | 14 ++++++++++++++
 ag.h           |  1 +
 doc/index.html | 11 +++++++++++
 5 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/Engine.cc b/Engine.cc
index 6ec8e89..452950c 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -1023,6 +1023,7 @@ Engine::Object::Object(bool is_static, OdeWorld & world,
     for (int i = 0; i < 4; i++)
         m_color[i] = 1.0f;
     m_texture = 0;
+    m_texture_scale = 1.0f;
     createManagedObject();
 }
 
@@ -1045,6 +1046,7 @@ Engine::Object::Object(const Engine::Object & orig)
     for (int i = 0; i < 4; i++)
         m_color[i] = orig.m_color[i];
     m_texture = orig.m_texture;
+    m_texture_scale = orig.m_texture_scale;
     if (m_is_managed)
         render();
 }
@@ -1182,7 +1184,8 @@ void Engine::Object::render()
                     {
                         if (m_texture != 0)
                         {
-                            glTexCoord2fv(tex_coords[v]);
+                            glTexCoord2f(tex_coords[v][0] * m_texture_scale,
+                                    tex_coords[v][1] * m_texture_scale);
                         }
                         glVertex3f(sides[s].verts[v][0] * width / 2.0,
                                 sides[s].verts[v][1] * depth / 2.0,
@@ -1269,12 +1272,12 @@ void Engine::Object::render()
                     float half_span = num_sections * section_size / 2.0;
                     float x_c = x * section_size - half_span;
                     float y_c = y * section_size - half_span;
-                    glTexCoord2f(0.0, y);
+                    glTexCoord2f(0.0, y * m_texture_scale);
                     glVertex3f(x_o + rotated_x[0] * x_c + rotated_y[0] * y_c,
                             y_o + rotated_x[1] * x_c + rotated_y[1] * y_c,
                             z_o + rotated_x[2] * x_c + rotated_y[2] * y_c);
                     x_c += section_size;
-                    glTexCoord2f(1.0, y);
+                    glTexCoord2f(1.0, y * m_texture_scale);
                     glVertex3f(x_o + rotated_x[0] * x_c + rotated_y[0] * y_c,
                             y_o + rotated_x[1] * x_c + rotated_y[1] * y_c,
                             z_o + rotated_x[2] * x_c + rotated_y[2] * y_c);
diff --git a/Engine.h b/Engine.h
index 02f98ef..c7cf793 100644
--- a/Engine.h
+++ b/Engine.h
@@ -68,6 +68,10 @@ class Engine
                     render();
                 }
                 void setTexture(GLuint tex);
+                void setTextureScale(float scale)
+                {
+                    m_texture_scale = scale;
+                }
                 void draw();
                 dReal getMass() { return m_ode_object->getMass(); }
                 void setMass(dReal mass) { m_ode_object->setMass(mass); }
@@ -93,6 +97,7 @@ class Engine
                 refptr< std::vector<float> > m_args;
                 float m_color[4];
                 GLuint m_texture;
+                float m_texture_scale;
         };
 
         class EngineFileLoader : public FileLoader
diff --git a/ag.cc b/ag.cc
index 546f3da..adbeb43 100644
--- a/ag.cc
+++ b/ag.cc
@@ -1054,6 +1054,20 @@ namespace ag
             return 0;
         }
 
+        int setTextureScale(lua_State * L)
+        {
+            int argc = lua_gettop(L);
+            if (argc == 2 && lua_istable(L, 1) && lua_isnumber(L, 2))
+            {
+                Engine::Object * obj = getObject(L, 1);
+                if (obj != NULL)
+                {
+                    obj->setTextureScale(lua_tonumber(L, 2));
+                }
+            }
+            return 0;
+        }
+
         int getMass(lua_State * L)
         {
             int argc = lua_gettop(L);
diff --git a/ag.h b/ag.h
index f17197c..01cac42 100644
--- a/ag.h
+++ b/ag.h
@@ -74,6 +74,7 @@ namespace ag
         int addTorqueRel(lua_State * L);
         int setColor(lua_State * L);
         int setTexture(lua_State * L);
+        int setTextureScale(lua_State * L);
         int getMass(lua_State * L);
         int setMass(lua_State * L);
         int getAABB(lua_State * L);
diff --git a/doc/index.html b/doc/index.html
index f21d904..9098f46 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -695,6 +695,17 @@ This function sets the texture of <tt>obj</tt> to <tt>tex</tt>.
 <a href="#ag_loadTexture">ag.loadTexture()</a>.
 </p>
 
+<a name="object_setTextureScale" />
+<h3>setTextureScale</h3>
+<p><tt>obj:setTextureScale(scale)</tt></p>
+<p>
+This function sets the "texture scale" for <tt>obj</tt>.
+Currently, texture scaling is only supported for boxes and planes.
+<tt>scale</tt> actually scales the texture coordinates.
+Hence a scale of 4 would appear to shrink the texture by a factor of
+4 and tile the texture 16 times where it normally would have once.
+</p>
+
 <a name="object_setVisible" />
 <h3>setVisible</h3>
 <p><tt>obj:setVisible(visible_flag)</tt></p>