From 5d42f27259fb1a497f26eecadb00d3fd7bea28bb Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Tue, 15 Nov 2011 12:52:42 +0000
Subject: [PATCH] tutorial: port the Mandelbrot dithering shader to Cg.

---
 src/platform/sdl/sdlapp.cpp |  2 ++
 test/math/remez.cpp         |  9 +++++++--
 test/tutorial/tut03.cpp     | 22 +++++++++++++++++++---
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/platform/sdl/sdlapp.cpp b/src/platform/sdl/sdlapp.cpp
index 02a6867b..9e40cf34 100644
--- a/src/platform/sdl/sdlapp.cpp
+++ b/src/platform/sdl/sdlapp.cpp
@@ -75,7 +75,9 @@ SdlApp::SdlApp(char const *title, ivec2 res, float fps) :
 
 void SdlApp::ShowPointer(bool show)
 {
+#if defined USE_SDL
     SDL_ShowCursor(show ? 1 : 0);
+#endif
 }
 
 void SdlApp::Run()
diff --git a/test/math/remez.cpp b/test/math/remez.cpp
index f582245d..c45d2aee 100644
--- a/test/math/remez.cpp
+++ b/test/math/remez.cpp
@@ -30,20 +30,25 @@ using namespace std;
 /* The function we want to approximate */
 real myfun(real const &y)
 {
+real k1024 = 1024;
+real klog32 = log((real)32);
+return (y - k1024) / log2(log(sqrt(y))/klog32);
     real x = sqrt(y);
     return (sin(x) - x) / (x * y);
 }
 
 real myerr(real const &y)
 {
+return myfun(y);
+return real::R_1;
     real x = sqrt(y);
     return sin(x) / (x * y);
 }
 
 int main(int argc, char **argv)
 {
-    RemezSolver<6> solver;
-    solver.Run(real::R_1 >> 400, real::R_PI_2 * real::R_PI_2, myfun, myerr, 40);
+    RemezSolver<3> solver;
+    solver.Run((real)(1024.001), (real)(1024 * 1024), myfun, myerr, 40);
 
     return EXIT_SUCCESS;
 }
diff --git a/test/tutorial/tut03.cpp b/test/tutorial/tut03.cpp
index 7049ad7f..5d21eae2 100644
--- a/test/tutorial/tut03.cpp
+++ b/test/tutorial/tut03.cpp
@@ -110,10 +110,18 @@ public:
         f64cmplx worldmouse = m_center + ScreenToWorldOffset(mousepos);
 
         ivec3 buttons = Input::GetMouseButtons();
+#ifdef __CELLOS_LV2__
+        if (true)
+#else
         if ((buttons[0] || buttons[2]) && mousepos.x != -1)
+#endif
         {
             f64cmplx oldcenter = m_center;
             double oldradius = m_radius;
+#ifdef __CELLOS_LV2__
+            m_radius *= pow(2.0, -deltams * 0.00015);
+            m_center = f64cmplx(0.001643721971153, 0.822467633298876);
+#else
             double zoom = pow(2.0, (buttons[0] ? -deltams : deltams) * 0.0025);
             if (m_radius * zoom > 8.0)
                 zoom = 8.0 / m_radius;
@@ -122,6 +130,7 @@ public:
             m_radius *= zoom;
             m_center = (m_center - worldmouse) * zoom + worldmouse;
             worldmouse = m_center + ScreenToWorldOffset(mousepos);
+#endif
 
             /* Store the transformation properties to go from m_frame-1
              * to m_frame. */
@@ -264,11 +273,18 @@ public:
                 "    out_Position = in_Position;"
                 "}",
 
-                "void main(float2 in_TexCoord : TEXCOORD0,"
-                "          uniform sampler2D tex,"
+                "void main(float4 in_FragCoord : WPOS,"
+                "          float2 in_TexCoord : TEXCOORD0,"
+                "          uniform sampler2D in_Texture,"
                 "          out float4 out_FragColor : COLOR)"
                 "{"
-                "    out_FragColor = tex2D(tex, in_TexCoord);"
+                "    float2 coord = in_TexCoord.xy;"
+                "    float i = frac((in_FragCoord.x - 0.5) * 0.5) * 2.0;"
+                "    float j = frac((in_FragCoord.y - 0.5 + i) * 0.5) * 2.0;"
+                "    coord.y += i + j * 2;"
+                "    coord.y *= 0.25;"
+                "    float4 p = tex2D(in_Texture, coord);"
+                "    out_FragColor = p;"
                 "}"
 #endif
             );