# lv_opengles_private.h (/api/drivers/opengles/lv_opengles_private_h)
Functions [#functions]
lv_opengles_render_params_init [#lv_opengles_render_params_init]
Initialize the render parameters with default values
```c title=" " lineNumbers=1
void lv_opengles_render_params_init(lv_opengles_render_params_t *params)
```
Parameters
| Name | Type | Description |
| -------- | -------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| `params` | | pointer to an initialized struct |
lv_opengles_render [#lv_opengles_render]
Render the content of the window/framebuffer using OpenGL
```c title=" " lineNumbers=1
void lv_opengles_render(const lv_opengles_render_params_t *params)
```
Parameters
| Name | Type | Description |
| -------- | -------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| `params` | | pointer to an initialized struct |
lv_opengles_render_texture_rbswap [#lv_opengles_render_texture_rbswap]
Render a texture using alternate blending mode, with red and blue channels flipped in the shader.
```c title=" " lineNumbers=1
void lv_opengles_render_texture_rbswap(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_regular_viewport [#lv_opengles_regular_viewport]
Set the OpenGL viewport, with vertical co-ordinate conversion
```c title=" " lineNumbers=1
void lv_opengles_regular_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_render_display [#lv_opengles_render_display]
```c title=" " lineNumbers=1
void lv_opengles_render_display(lv_display_t *display, const lv_opengles_render_params_t *params)
```
Parameters
| Name | Type |
| --------- | -------------------------------------------------------------------------------------------- |
| `display` | |
| `params` | |
Structs [#structs]
lv_opengles_render_params_t [#lv_opengles_render_params_t]
| Member | Type | Description |
| ------------------- | ------------------------------------------------------------ | ----------- |
| `texture` | `unsigned int` | |
| `texture_area` | | |
| `opa` | | |
| `disp_w` | | |
| `disp_h` | | |
| `texture_clip_area` | | |
| `h_flip` | | |
| `v_flip` | | |
| `rb_swap` | | |
| `fill_color` | | |
| `blend_opt` | | |
| `matrix` | | |
* `lv_opengles_render_params_init` — param `params`
* `lv_opengles_render` — param `params`
* `lv_opengles_render_display` — param `params`
Macros [#macros]
GL_BGRA [#gl_bgra]
```c title=" " lineNumbers=1
#define GL_BGRA GL_BGRA_EXT
```
GL_TEXTURE_MAX_LEVEL [#gl_texture_max_level]
```c title=" " lineNumbers=1
#define GL_TEXTURE_MAX_LEVEL GL_TEXTURE_MAX_LEVEL_APPLE
```
GL_UNPACK_ROW_LENGTH [#gl_unpack_row_length]
```c title=" " lineNumbers=1
#define GL_UNPACK_ROW_LENGTH GL_UNPACK_ROW_LENGTH_EXT
```
glGenVertexArrays [#glgenvertexarrays]
```c title=" " lineNumbers=1
#define glGenVertexArrays glGenVertexArraysOES
```
glBindVertexArray [#glbindvertexarray]
```c title=" " lineNumbers=1
#define glBindVertexArray glBindVertexArrayOES
```
glDeleteVertexArrays [#gldeletevertexarrays]
```c title=" " lineNumbers=1
#define glDeleteVertexArrays glDeleteVertexArraysOES
```
glTexStorage2D [#gltexstorage2d]
```c title=" " lineNumbers=1
#define glTexStorage2D glTexStorage2DEXT
```
GL_RGBA32F [#gl_rgba32f]
```c title=" " lineNumbers=1
#define GL_RGBA32F 0x8814
```
GL_NUM_EXTENSIONS [#gl_num_extensions]
```c title=" " lineNumbers=1
#define GL_NUM_EXTENSIONS 0x821D
```
GL_RGB8 [#gl_rgb8]
```c title=" " lineNumbers=1
#define GL_RGB8 0x8051
```
GL_RGBA8 [#gl_rgba8]
```c title=" " lineNumbers=1
#define GL_RGBA8 0x8058
```
LV_GL_PREFERRED_DEPTH [#lv_gl_preferred_depth]
```c title=" " lineNumbers=1
#define LV_GL_PREFERRED_DEPTH GL_DEPTH_COMPONENT16
```
Dependencies [#dependencies]