From 1472c11a0a361e791714ed2fa40e51d912e0d320 Mon Sep 17 00:00:00 2001
From: Mylloon <kennel.anri@tutanota.com>
Date: Thu, 25 May 2023 10:29:35 +0200
Subject: [PATCH] tourne et manege

---
 includes/animations.h |  3 +++
 main.c                | 10 +++++-----
 shaders/rotation.fs   | 25 +++++++++++++++++++++++++
 src/animations.c      | 26 ++++++++++++++++++++++++++
 4 files changed, 59 insertions(+), 5 deletions(-)
 create mode 100644 shaders/rotation.fs

diff --git a/includes/animations.h b/includes/animations.h
index 267de78..3add1e6 100644
--- a/includes/animations.h
+++ b/includes/animations.h
@@ -23,6 +23,9 @@ void transitionsInit(void);
 // Transition zoom
 void zoomIn(void (*)(int), void (*)(int), Uint32, Uint32, const int);
 
+// Transition qui tourne
+void rotation(void (*)(int), void (*)(int), Uint32, Uint32, const int);
+
 // Personnage
 struct manifestant {
   GLuint corps, tete, jambe_g, jambe_d, bras_g, bras_d;
diff --git a/main.c b/main.c
index fbb8c41..973b599 100644
--- a/main.c
+++ b/main.c
@@ -20,11 +20,11 @@ int main(const int argc, char *argv[]) {
   }
 
   // Animations
-  GL4DHanime animations[] = {{10000, manif, NULL, NULL},   // Manifestation
-                             {2000, manif, tag, zoomIn},   // Transition
-                             {10000, tag, NULL, NULL},     // Tag
-                             {2000, tag, credits, zoomIn}, // Transition
-                             {9500, credits, NULL, NULL},  // Crédits
+  GL4DHanime animations[] = {{10000, manif, NULL, NULL},     // Manifestation
+                             {2000, manif, tag, zoomIn},     // Transition
+                             {10000, tag, NULL, NULL},       // Tag
+                             {2000, tag, credits, rotation}, // Transition
+                             {9500, credits, NULL, NULL},    // Crédits
                              {0, NULL, NULL, NULL}};
 
   gl4dhInit(animations, _dims[0], _dims[1], init);
diff --git a/shaders/rotation.fs b/shaders/rotation.fs
new file mode 100644
index 0000000..d8d63b3
--- /dev/null
+++ b/shaders/rotation.fs
@@ -0,0 +1,25 @@
+#version 330
+
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+uniform float progress;
+
+in vec2 vsoTexCoord;
+out vec4 fragColor;
+
+void main() {
+  vec2 center = vec2(.5);
+  vec2 offset = vsoTexCoord - center;
+
+  float angle = progress * radians(180) * 2;
+  float sinTheta = sin(angle);
+  float cosTheta = cos(angle);
+  vec2 rotatedOffset = vec2(cosTheta * offset.x - sinTheta * offset.y, sinTheta * offset.x + cosTheta * offset.y);
+
+  vec2 distortedTexCoord = center + rotatedOffset;
+
+  vec4 color1 = texture(tex0, vsoTexCoord);
+  vec4 color2 = texture(tex1, distortedTexCoord);
+
+  fragColor = mix(color1, color2, smoothstep(0., 1., progress));
+}
diff --git a/src/animations.c b/src/animations.c
index 60efd9d..889bca9 100644
--- a/src/animations.c
+++ b/src/animations.c
@@ -195,3 +195,29 @@ void drawManifestant(const char *matrix_model, const struct manifestant *hero,
   gl4duSendMatrices();
   gl4dgDraw(hero->bras_d);
 }
+
+void rotation(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et,
+              const int state) {
+  const int gpu = 1;
+  static GLuint tex[2];
+  switch (state) {
+  case GL4DH_INIT:
+    transition_init("rotation", gpu, tex);
+    break;
+
+  case GL4DH_DRAW:
+    transition_draw(a0, a1, t, et, state, gpu, tex);
+    break;
+
+  case GL4DH_FREE:
+    transition_deinit(tex);
+    break;
+
+  case GL4DH_UPDATE_WITH_AUDIO:
+    update_with_audio(a0, a1, state);
+    break;
+
+  default:
+    break;
+  }
+}