# lv_opengles_driver.h (/api/drivers/opengles/lv_opengles_driver_h)
Functions [#functions]
lv_opengles_init [#lv_opengles_init]
Initialize OpenGL
```c title=" " lineNumbers=1
void lv_opengles_init(void)
```
it is not necessary to call this if you use `lv_opengles_glfw_window_create`
lv_opengles_deinit [#lv_opengles_deinit]
Deinitialize OpenGL
```c title=" " lineNumbers=1
void lv_opengles_deinit(void)
```
it is not necessary to call this if you use `lv_opengles_glfw_window_create`
lv_opengles_render_texture [#lv_opengles_render_texture]
Render a texture using alternate blending mode for smoother translucent materials and correct anti-aliasing of glTF elements when using transparent background
```c title=" " lineNumbers=1
void lv_opengles_render_texture(unsigned int texture, const lv_area_t *texture_area, lv_opa_t opa, int32_t disp_w, int32_t disp_h, const lv_area_t *texture_clip_area, bool h_flip, bool v_flip)
```
Parameters
| Name | Type | Description |
| ------------------- | -------------------------------------------------------- | --------------------------------------------------- |
| `texture` | `unsigned int` | OpenGL texture ID |
| `texture_area` | | the area in the window to render the texture in |
| `opa` | | opacity to blend the texture with existing contents |
| `disp_w` | | width of the window/framebuffer being rendered to |
| `disp_h` | | height of the window/framebuffer being rendered to |
| `texture_clip_area` | | |
| `h_flip` | | horizontal flip |
| `v_flip` | | vertical flip |
lv_opengles_render_display_texture [#lv_opengles_render_display_texture]
Render a display texture - Supports rotation - Switches red and blue channels
```c title=" " lineNumbers=1
void lv_opengles_render_display_texture(lv_display_t *display, bool h_flip, bool v_flip)
```
Parameters
| Name | Type | Description |
| --------- | -------------------------------------------------------- | ------------------------------------------------------------------- |
| `display` | | LVGL Texture display. Created with the `lv_opengles_texture` module |
| `h_flip` | | horizontal flip |
| `v_flip` | | vertical flip |
lv_opengles_render_fill [#lv_opengles_render_fill]
Render a fill
```c title=" " lineNumbers=1
void lv_opengles_render_fill(lv_color_t color, const lv_area_t *area, lv_opa_t opa, int32_t disp_w, int32_t disp_h)
```
Parameters
| Name | Type | Description |
| -------- | -------------------------------------------------------- | -------------------------------------------------- |
| `color` | | the color of the fill |
| `area` | | the area in the window to render the fill |
| `opa` | | opacity to blend the fill with existing contents |
| `disp_w` | | width of the window/framebuffer being rendered to |
| `disp_h` | | height of the window/framebuffer being rendered to |
lv_opengles_render_clear [#lv_opengles_render_clear]
Clear the window/display
```c title=" " lineNumbers=1
void lv_opengles_render_clear(void)
```
lv_opengles_viewport [#lv_opengles_viewport]
Set the OpenGL viewport
```c title=" " lineNumbers=1
void lv_opengles_viewport(int32_t x, int32_t y, int32_t w, int32_t h)
```
Parameters
| Name | Type | Description |
| ---- | -------------------------- | -------------------------- |
| `x` | | x position of the viewport |
| `y` | | y position of the viewport |
| `w` | | width of the viewport |
| `h` | | height of the viewport |
lv_opengles_reinit_state [#lv_opengles_reinit_state]
Reinitialize OpenGL state after external GL operations (e.g., NanoVG) This rebinds VAO, VBO, IBO and resets vertex attributes
```c title=" " lineNumbers=1
void lv_opengles_reinit_state(void)
```
Dependencies [#dependencies]