partially done work on total source tree rework, separation of engine context and game context, generalization of renderer for different backends as well as web platform target

src/rendering/twn_gl_15_gpu_texture.c

@@ -0,0 +1,28 @@
+static gpu_texture new_gl_texture(void) {
+    GLuint texture;
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,     GL_REPEAT);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,     GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP,    GL_TRUE);
+
+#if !defined(EMSCRIPTEN)
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+#endif
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    return create_gpu_texture(TEXTURE_FILTER_NEAREST, true);
+}
+
+    glTexImage2D(GL_TEXTURE_2D,
+                 0,
+                 GL_RGBA8,
+                 surface->w,
+                 surface->h,
+                 0,
+                 GL_RGBA,
+                 GL_UNSIGNED_BYTE,
+                 surface->pixels);