added rotation

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;
 }

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;
 }

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);
+        glUniformMatrix4fv(modelMatrixLocation, 1, GL_FALSE, &model[0][0]);
-        glBindTexture(GL_TEXTURE_2D, textureId);
+        //glActiveTexture(GL_TEXTURE0);
+        //glBindTexture(GL_TEXTURE_2D, textureId);
         glDrawElements(GL_TRIANGLES, numIndices, GL_UNSIGNED_INT, 0);
         vertexBuffer.unbind();
         indexBuffer.unbind();