Rendering sprites

src/spriterenderer.cpp

@@ -0,0 +1,61 @@
+#include "spriterenderer.h"
+
+SpriteRenderer::SpriteRenderer(const Shader& shader)
+{
+    this->shader = shader;
+    this->initRenderData();
+}
+
+SpriteRenderer::~SpriteRenderer()
+{
+    glDeleteVertexArrays(1, &this->quadVAO);
+}
+void SpriteRenderer::initRenderData()
+{
+    unsigned int VBO;
+    float vertices [] = {
+        0.0f, 1.0f, 0.0f, 1.0f,
+        1.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 0.0f, 
+    
+        0.0f, 1.0f, 0.0f, 1.0f,
+        1.0f, 1.0f, 1.0f, 1.0f,
+        1.0f, 0.0f, 1.0f, 0.0f
+    };
+
+    glGenVertexArrays(1, &this->quadVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(this->quadVAO);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+}
+
+void SpriteRenderer::DrawSprite(const Texture2D& texture, glm::vec2 position, glm::vec2 size, float rotate, glm::vec3 color )
+{
+    // prepare transformations
+    this->shader.Use();
+    glm::mat4 model = glm::mat4(1.0f);
+    model = glm::translate(model, glm::vec3(position, 0.0f));
+
+    model = glm::translate(model, glm::vec3(0.5f * size.x , 0.5f * size.y, 0.0f));
+    model = glm::rotate(model, glm::radians(rotate), glm::vec3(0.0f,0.0f, 1.0f));
+    model = glm::translate(model, glm::vec3(-0.5 * size.x ,-0.5 * size.y, 0.0f));
+
+    model = glm::scale(model, glm::vec3(size, 1.0f));
+
+    this->shader.SetMatrix4("model", model);
+    this->shader.SetVector3f("spriteColor", color);
+
+    glActiveTexture(GL_TEXTURE0);
+    texture.Bind();
+
+    glBindVertexArray(this->quadVAO);
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    glBindVertexArray(0);
+}