i commit

1 files changed, 62 insertions, 0 deletions

diff --git a/Canvas.h b/Canvas.h
new file mode 100644
index 0000000..b2f943d
--- /dev/null
+++ b/Canvas.h
@@ -0,0 +1,62 @@
+//
+// Created by saintruler on 04.05.19.
+//
+
+#ifndef OPENGLTEST_CANVAS_H
+#define OPENGLTEST_CANVAS_H
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include <iostream>
+
+struct Color
+{
+    unsigned int r = 0, g = 0, b = 0;
+};
+
+class Canvas
+{
+public:
+    Canvas(int width, int height)
+    {
+        this->width = width;
+        this->height = height;
+
+        canvas = (unsigned char*) malloc(width * height * 3);
+        glGenTextures(1, &texture);
+    }
+
+    void SetPixel(int x, int y, Color color)
+    {
+        glBindTexture(GL_TEXTURE_2D, texture); // all upcoming GL_TEXTURE_2D operations now have effect on this texture object
+
+        // set texture wrapping to GL_REPEAT (default wrapping method)
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+        // set texture filtering parameters
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        canvas[y * width * 3 + x * 3 + 0] = color.r;
+        canvas[y * width * 3 + x * 3 + 1] = color.g;
+        canvas[y * width * 3 + x * 3 + 2] = color.b;
+
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, width, 0, GL_RGB, GL_UNSIGNED_BYTE, canvas);
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+
+    unsigned int* GetTexture()
+    {
+        return &(this->texture);
+    }
+
+private:
+    int width, height;
+    unsigned char* canvas;
+    unsigned int texture;
+};
+
+#endif //OPENGLTEST_CANVAS_H