first commit

SpriteRenderer.cpp

@@ -0,0 +1,77 @@
+#include "SpriteRenderer.h"
+
+
+SpriteRenderer::SpriteRenderer(Shader& shader)
+{
+    this->shader = shader;
+    this->initRenderData();
+}
+
+SpriteRenderer::~SpriteRenderer()
+{
+    glDeleteVertexArrays(1, &this->quadVAO);
+}
+
+void SpriteRenderer::DrawSprite(Texture& texture, glm::vec2 position, glm::vec4 UV, glm::vec2 size, GLfloat rotate)
+{
+    GLfloat vertices[] = {
+        // Pos      // Tex
+        0.0f * size.x + position.x, 1.0f * size.y + position.y,  UV.x, UV.y,
+        1.0f * size.x + position.x, 0.0f * size.y + position.y,  UV.z, UV.w,
+        0.0f * size.x + position.x, 0.0f * size.y + position.y,  UV.x, UV.w,
+        1.0f * size.x + position.x, 1.0f * size.y + position.y,  UV.z, UV.y
+    };
+    glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    // Prepare transformations
+    //this->shader.Use();
+    //glm::mat4 model = glm::mat4(1.0);
+    
+   // model = glm::translate(model, glm::vec3(position, 0.0f));  // First translate (transformations are: scale happens first, then rotation and then finall translation happens; reversed order)
+
+    //model = glm::translate(model, glm::vec3(0.5f * size.x, 0.5f * size.y, 0.0f)); // Move origin of rotation to center of quad
+    //model = glm::rotate(model, rotate, glm::vec3(0.0f, 0.0f, 1.0f)); // Then rotate
+    //model = glm::translate(model, glm::vec3(-0.5f * size.x, -0.5f * size.y, 0.0f)); // Move origin back
+
+    //model = glm::scale(model, glm::vec3(size, 1.0f)); // Last scale
+    
+    //this->shader.SetMatrix4("model", model);
+    
+    // Render textured quad
+
+    texture.bind(); 
+
+    glBindVertexArray(this->quadVAO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->EBO);
+    glDrawElements(
+        GL_TRIANGLES,      // mode
+        6,    // count
+        GL_UNSIGNED_INT,   // type
+        (void*)0           // element array buffer offset
+    );
+}
+
+void SpriteRenderer::initRenderData()
+{
+    // Configure VAO/VBO
+    unsigned int indices[] = {
+        2, 1, 0,
+        0, 1, 3
+    };
+
+    glGenVertexArrays(1, &this->quadVAO);
+    glGenBuffers(1, &this->VBO);
+    glGenBuffers(1, &this->EBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->EBO);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+    glBindVertexArray(this->quadVAO);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (GLvoid*)0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+    glActiveTexture(GL_TEXTURE0);
+}