From af1e96ce6d167d9f5f7fe1044a87aff94993590b Mon Sep 17 00:00:00 2001
From: miaurizius <maurice@miaurizius.de>
Date: Thu, 16 Apr 2026 02:04:32 +0200
Subject: [PATCH] added perspective

---
 CMakeLists.txt     |  1 +
 shaders/basic.vert |  4 ++--
 src/main.cpp       | 21 +++++++++++++++------
 3 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8fa5d7..02a17ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,7 @@ add_executable(${PROJECT_NAME} src/main.cpp
 target_compile_definitions(${PROJECT_NAME} PRIVATE $<$<CONFIG:Debug>:_DEBUG>)
 
 target_include_directories(${PROJECT_NAME} PRIVATE include)
+target_include_directories(${PROJECT_NAME} PRIVATE libs)
 target_include_directories(${PROJECT_NAME} PRIVATE shaders)
 
 add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
diff --git a/shaders/basic.vert b/shaders/basic.vert
index 4906e06..a4210e6 100644
--- a/shaders/basic.vert
+++ b/shaders/basic.vert
@@ -7,10 +7,10 @@ layout(location = 2) in vec4 a_color;
 out vec4 v_color;
 out vec2 v_texCoord;
 
-uniform mat4 u_model;
+uniform mat4 u_modelViewProj;
 
 void main() {
-    gl_Position = u_model * vec4(a_position, 1.0f);
+    gl_Position = u_modelViewProj * 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 b236918..553a4ad 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,9 +9,10 @@
 #include "VertexBuffer.hpp"
 #include "Shader.hpp"
 #define STB_IMAGE_IMPLEMENTATION
-#include "../libs/stb_image.hpp"
-#include "../libs/glm/glm.hpp"
-#include "../libs/glm/ext/matrix_transform.hpp"
+#include "stb_image.hpp"
+#include "glm/glm.hpp"
+#include "glm/ext/matrix_transform.hpp"
+#include "glm/gtc/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)
@@ -165,10 +166,17 @@ int main() {
     uint64 lastCounter = SDL_GetPerformanceCounter();
     float32 delta = 0.0f;
 
-    glm::mat4 model = glm::mat4(1.0f);
+    auto model = glm::mat4(1.0f);
     model = glm::scale(model, glm::vec3(1.2f));
 
-    int modelMatrixLocation = glGetUniformLocation(shader.getShaderId(), "u_model");
+    auto projection = glm::ortho(-2.0f, 2.0f, -2.0f, 2.0f, -10.0f, 100.0f);
+    projection = glm::perspective(glm::radians(45.0f), 4.0f/3.0f, 0.1f, 100.0f);
+
+    auto view = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f, 0.0f, -3.0f));
+
+    auto modelViewProj = projection * view * model;
+
+    int modelViewProjMatrixLocation = glGetUniformLocation(shader.getShaderId(), "u_modelViewProj");
 
     // WIREFRAME
     //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
@@ -183,6 +191,7 @@ int main() {
         time += delta;
 
         model = glm::rotate(model, 1.0f*delta, glm::vec3(0.0f, 1.0f, 0.0f));
+        modelViewProj = projection * view * model;
 
         if (colorUniformLocation != 1) {
             glUniform4f(colorUniformLocation, sinf(time)*sinf(time), 0.0f, 1.0f, 1.0f);
@@ -191,7 +200,7 @@ int main() {
         // FRAME GENERATION
         vertexBuffer.bind();
         indexBuffer.bind();
-        glUniformMatrix4fv(modelMatrixLocation, 1, GL_FALSE, &model[0][0]);
+        glUniformMatrix4fv(modelViewProjMatrixLocation, 1, GL_FALSE, &modelViewProj[0][0]);
         //glActiveTexture(GL_TEXTURE0);
         //glBindTexture(GL_TEXTURE_2D, textureId);
         glDrawElements(GL_TRIANGLES, numIndices, GL_UNSIGNED_INT, 0);