Port boxes demo to use math3d throughout

Patch originally by Ian Walters.

1 files changed, 14 insertions, 12 deletions

diff --git a/demos/boxes/glbuffers.cpp b/demos/boxes/glbuffers.cpp
index b2a594e..a25a425 100644
--- a/demos/boxes/glbuffers.cpp
+++ b/demos/boxes/glbuffers.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "glbuffers.h"
+#include <QtGui/qmatrix4x4.h>
 
 //============================================================================//
 //                                  GLTexture                                 //
@@ -346,7 +347,7 @@ void GLRenderTargetCube::end()
     m_fbo.setAsRenderTarget(false);
 }
 
-void GLRenderTargetCube::getViewMatrix(gfx::Matrix4x4f& mat, int face)
+void GLRenderTargetCube::getViewMatrix(QMatrix4x4& mat, int face)
 {
     if (face < 0 || face >= 6) {
         qWarning("GLRenderTargetCube::getViewMatrix: 'face' must be in the range [0, 6). (face == %d)", face);
@@ -371,20 +372,21 @@ void GLRenderTargetCube::getViewMatrix(gfx::Matrix4x4f& mat, int face)
         {-1.0f, -1.0f, +1.0f},
     };
 
-    memset(mat.bits(), 0, sizeof(float) * 16);
+    memset(mat.data(), 0, sizeof(float) * 16);
     for (int i = 0; i < 3; ++i)
-        mat(perm[face][i], i) = signs[face][i];
+        mat(i, perm[face][i]) = signs[face][i];
     mat(3, 3) = 1.0f;
 }
 
-void GLRenderTargetCube::getProjectionMatrix(gfx::Matrix4x4f& mat, float nearZ, float farZ)
+void GLRenderTargetCube::getProjectionMatrix(QMatrix4x4& mat, float nearZ, float farZ)
 {
-    float proj[] = {
-        1.0f, 0.0f, 0.0f, 0.0f,
-        0.0f, 1.0f, 0.0f, 0.0f,
-        0.0f, 0.0f, (nearZ+farZ)/(nearZ-farZ), -1.0f,
-        0.0f, 0.0f, 2.0f*nearZ*farZ/(nearZ-farZ), 0.0f,
-    };
-
-    memcpy(mat.bits(), proj, sizeof(float) * 16);
+    static const QMatrix4x4 reference(
+            1.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 1.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, -1.0f, 0.0f);
+
+    mat = reference;
+    mat(2, 2) = (nearZ+farZ)/(nearZ-farZ);
+    mat(2, 3) = 2.0f*nearZ*farZ/(nearZ-farZ);
 }