From d7036e5b7959a0ad118d6cb537499e839dbbce60 Mon Sep 17 00:00:00 2001
From: Mylloon <kennel.anri@tutanota.com>
Date: Fri, 19 May 2023 12:09:54 +0200
Subject: [PATCH] try to zoom (not working)

---
 shaders/zoom_in.fs |  6 +++++
 shaders/zoom_in.vs | 10 +++++++
 src/animations.c   | 66 +++++++++++++++++++++++++++++++++++++++-------
 3 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/shaders/zoom_in.fs b/shaders/zoom_in.fs
index 3060f41..f8f5eda 100644
--- a/shaders/zoom_in.fs
+++ b/shaders/zoom_in.fs
@@ -1,4 +1,10 @@
 #version 330
 
+uniform sampler2D tex;
+
+in vec2 vsoTexCoord;
+out vec4 fragColor;
+
 void main(void) {
+  fragColor = texture(tex, vsoTexCoord);
 }
diff --git a/shaders/zoom_in.vs b/shaders/zoom_in.vs
index 3060f41..acb688a 100644
--- a/shaders/zoom_in.vs
+++ b/shaders/zoom_in.vs
@@ -1,4 +1,14 @@
 #version 330
 
+layout(location = 0) in vec3 vsiPosition;
+layout(location = 2) in vec2 vsiTexCoord;
+
+uniform float zoomAmount;
+
+out vec2 vsoTexCoord;
+
 void main(void) {
+  gl_Position = vec4(vsiPosition, 1.0);
+
+  vsoTexCoord = vec2(vsiTexCoord.s * zoomAmount, vsiTexCoord.t * zoomAmount);
 }
diff --git a/src/animations.c b/src/animations.c
index a59a2fe..bc96d23 100644
--- a/src/animations.c
+++ b/src/animations.c
@@ -3,8 +3,10 @@
 /* Mise-à-jour des animations en fonction du son */
 static void update_with_audio(void (*)(int), void (*)(int), int);
 
-static void zoom_in_init(void);
-static void zoom_in_draw(void);
+static GLuint _zoomin_pId = 0, _zoomin_tId = 0, _zoomin_tex[2];
+static void zoomin_init(void);
+static void zoomin_draw(void (*)(int), void (*)(int), Uint32, Uint32, int);
+static void zoomin_deinit(void);
 
 static void update_with_audio(void (*a0)(int), void (*a1)(int), int state) {
   if (a0) {
@@ -19,11 +21,15 @@ static void update_with_audio(void (*a0)(int), void (*a1)(int), int state) {
 void zoom_in(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et, int state) {
   switch (state) {
   case GL4DH_INIT:
-    zoom_in_init();
+    zoomin_init();
     break;
 
   case GL4DH_DRAW:
-    zoom_in_draw();
+    zoomin_draw(a0, a1, t, et, state);
+    break;
+
+  case GL4DH_FREE:
+    zoomin_deinit();
     break;
 
   case GL4DH_UPDATE_WITH_AUDIO:
@@ -35,10 +41,52 @@ void zoom_in(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et, int state) {
   }
 }
 
-static void zoom_in_init(void) {
-  static GLuint _pId = 0;
-  _pId = gl4duCreateProgram("<vs>shaders/zoom_in.vs", "<fs>shaders/zoom_in.fs",
-                            NULL);
+static void zoomin_init(void) {
+  int vp[4];
+  glGetIntegerv(GL_VIEWPORT, vp);
+
+  glGenTextures(2, _zoomin_tex);
+  for (int i = 0; i < 2; ++i) {
+    glBindTexture(GL_TEXTURE_2D, _zoomin_tex[i]);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, vp[2], vp[3], 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, NULL);
+  }
+  _zoomin_pId = gl4duCreateProgram("<vs>shaders/zoom_in.vs",
+                                   "<fs>shaders/zoom_in.fs", NULL);
 }
 
-static void zoom_in_draw(void) {}
+static void zoomin_draw(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et,
+                        int state) {
+  glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                        GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
+                                        (GLint *)&_zoomin_tId);
+
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         _zoomin_tex[0], 0);
+  if (a0) {
+    a0(state);
+  }
+
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         _zoomin_tex[1], 0);
+  if (a1) {
+    a1(state);
+  }
+
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         _zoomin_tId, 0);
+
+  glUseProgram(_zoomin_pId);
+  glUniform1f(glGetUniformLocation(_zoomin_pId, "zoomAmount"),
+              (GLfloat)et / (GLfloat)t);
+  glUniform1i(glGetUniformLocation(_zoomin_pId, "tex"), 0);
+}
+
+static void zoomin_deinit(void) {
+  if (_zoomin_tex[0]) {
+    glDeleteTextures(2, _zoomin_tex);
+    _zoomin_tex[0] = _zoomin_tex[1] = 0;
+  }
+}