From 3fb766de7cd13c6f57443a9626a115a69e5b7d74 Mon Sep 17 00:00:00 2001
From: miaurizius <maurice@miaurizius.de>
Date: Thu, 16 Apr 2026 01:41:31 +0200
Subject: [PATCH] added rotation

---
 shaders/basic.frag |  2 +-
 shaders/basic.vert |  4 +++-
 src/main.cpp       | 23 ++++++++++++++---------
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/shaders/basic.frag b/shaders/basic.frag
index 7cc5906..7a4c151 100644
--- a/shaders/basic.frag
+++ b/shaders/basic.frag
@@ -10,5 +10,5 @@ uniform vec4 u_color;
 
 void main() {
     vec4 texColor = texture(u_texture, v_texCoord);
-    f_color = texColor;
+    f_color = v_color;
 }
\ No newline at end of file
diff --git a/shaders/basic.vert b/shaders/basic.vert
index 1e0c942..4906e06 100644
--- a/shaders/basic.vert
+++ b/shaders/basic.vert
@@ -7,8 +7,10 @@ layout(location = 2) in vec4 a_color;
 out vec4 v_color;
 out vec2 v_texCoord;
 
+uniform mat4 u_model;
+
 void main() {
-    gl_Position = vec4(a_position, 1.0f);
+    gl_Position = u_model * vec4(a_position, 1.0f);
     v_color = a_color;
     v_texCoord = a_texCoord;
 }
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 5505cf2..b236918 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,6 +10,8 @@
 #include "Shader.hpp"
 #define STB_IMAGE_IMPLEMENTATION
 #include "../libs/stb_image.hpp"
+#include "../libs/glm/glm.hpp"
+#include "../libs/glm/ext/matrix_transform.hpp"
 
 void openGLDebugCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam) {
     if (severity == GL_DEBUG_SEVERITY_NOTIFICATION) return; //ignore notifications (mostly performance information)
@@ -105,22 +107,17 @@ int main() {
         Vertex{-0.5f, -0.5f, 0.0f,
             0.0f, 0.0f,
             1.0f, 0.0f, 0.0f, 1.0f},
-        Vertex{-0.5f, 0.5f, 0.0f,
+        Vertex{0.5f, -0.5f, 0.0f,
             0.0f, 1.0f,
             0.0, 1.0f, 0.0f, 1.0f},
-        Vertex{0.5f, -0.5f, 0.0f,
+        Vertex{0.0f, 0.5f, 0.0f,
             1.0f, 0.0f,
             0.0f, 0.0f, 1.0f, 1.0f},
-
-        Vertex{0.5f, 0.5f, 0.0f,
-            1.0f, 1.0f,
-            1.0f, 0.0f, 0.0f, 1.0f},
     };
     uint32 numVertices = sizeof(vertices) / sizeof(Vertex);
 
     uint32 indices[] = {
         0, 1, 2,
-        1, 2, 3
     };
     uint32 numIndices = sizeof(indices) / sizeof(uint32);
 
@@ -168,6 +165,11 @@ int main() {
     uint64 lastCounter = SDL_GetPerformanceCounter();
     float32 delta = 0.0f;
 
+    glm::mat4 model = glm::mat4(1.0f);
+    model = glm::scale(model, glm::vec3(1.2f));
+
+    int modelMatrixLocation = glGetUniformLocation(shader.getShaderId(), "u_model");
+
     // WIREFRAME
     //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 
@@ -180,6 +182,8 @@ int main() {
         glClear(GL_COLOR_BUFFER_BIT);
         time += delta;
 
+        model = glm::rotate(model, 1.0f*delta, glm::vec3(0.0f, 1.0f, 0.0f));
+
         if (colorUniformLocation != 1) {
             glUniform4f(colorUniformLocation, sinf(time)*sinf(time), 0.0f, 1.0f, 1.0f);
         }
@@ -187,8 +191,9 @@ int main() {
         // FRAME GENERATION
         vertexBuffer.bind();
         indexBuffer.bind();
-        glActiveTexture(GL_TEXTURE0);
-        glBindTexture(GL_TEXTURE_2D, textureId);
+        glUniformMatrix4fv(modelMatrixLocation, 1, GL_FALSE, &model[0][0]);
+        //glActiveTexture(GL_TEXTURE0);
+        //glBindTexture(GL_TEXTURE_2D, textureId);
         glDrawElements(GL_TRIANGLES, numIndices, GL_UNSIGNED_INT, 0);
         vertexBuffer.unbind();
         indexBuffer.unbind();