From dda5e2cab04a509ee532fac214eeff7222ab479d Mon Sep 17 00:00:00 2001
From: Mylloon <kennel.anri@tutanota.com>
Date: Fri, 19 May 2023 13:01:20 +0200
Subject: [PATCH] wow the zoom is fonctionning

---
 shaders/zoom_in.fs | 14 +++++++++++---
 shaders/zoom_in.vs |  5 +----
 src/animations.c   | 18 +++++++++++++++---
 3 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/shaders/zoom_in.fs b/shaders/zoom_in.fs
index f8f5eda..bdec4f2 100644
--- a/shaders/zoom_in.fs
+++ b/shaders/zoom_in.fs
@@ -1,10 +1,18 @@
 #version 330
 
-uniform sampler2D tex;
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+uniform float zoom;
 
 in vec2 vsoTexCoord;
 out vec4 fragColor;
 
-void main(void) {
-  fragColor = texture(tex, vsoTexCoord);
+void main() {
+  vec2 center = vec2(0.5);
+  vec2 zoomedTexCoord = mix(center, vsoTexCoord, zoom);
+
+  vec4 color1 = texture(tex0, vsoTexCoord);
+  vec4 color2 = texture(tex1, zoomedTexCoord);
+
+  fragColor = mix(color1, color2, smoothstep(0., 1., zoom));
 }
diff --git a/shaders/zoom_in.vs b/shaders/zoom_in.vs
index acb688a..4193e5e 100644
--- a/shaders/zoom_in.vs
+++ b/shaders/zoom_in.vs
@@ -3,12 +3,9 @@
 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);
+  vsoTexCoord = vsiTexCoord;
 }
diff --git a/src/animations.c b/src/animations.c
index a1ac3bf..f6abfba 100644
--- a/src/animations.c
+++ b/src/animations.c
@@ -84,11 +84,23 @@ static void zoomin_draw(void (*a0)(int), void (*a1)(int), Uint32 t, Uint32 et,
   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                          _zoomin_tId, 0);
 
+  glDisable(GL_DEPTH_TEST);
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, _zoomin_tex[0]);
+  glActiveTexture(GL_TEXTURE1);
+  glBindTexture(GL_TEXTURE_2D, _zoomin_tex[1]);
+
   glUseProgram(_zoomin_pId);
-  glUniform1f(glGetUniformLocation(_zoomin_pId, "zoomAmount"),
-              (GLfloat)et / (GLfloat)t);
-  glUniform1i(glGetUniformLocation(_zoomin_pId, "tex"), 0);
+  GLfloat zoom = (GLfloat)et / (GLfloat)t;
+  glUniform1f(glGetUniformLocation(_zoomin_pId, "zoom"), (1.f - zoom));
+  glUniform1i(glGetUniformLocation(_zoomin_pId, "tex1"), 0);
+  glUniform1i(glGetUniformLocation(_zoomin_pId, "tex0"), 1);
   gl4dgDraw(_quadId);
+
+  glActiveTexture(GL_TEXTURE1);
+  glBindTexture(GL_TEXTURE_2D, 0);
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, 0);
 }
 
 static void zoomin_deinit(void) {