Struct OpenGLContext 

pub struct OpenGLContext { /* private fields */ }

OpenGL backend context. In a headless / test environment this behaves identically to SoftwareContext since we don’t have a live GL context. When a real GL context is available (via the engine pipeline), the handles map to actual GL object names.

Implementations

impl OpenGLContext

pub fn new(has_gl: bool) -> Self

Create a new OpenGL context. Pass true for has_gl if a real GL context is current on this thread (we just store a flag here; the actual glow::Context would be threaded through in production).

pub fn has_gl(&self) -> bool

Whether a live GL context is attached.

Trait Implementations

impl BackendContext for OpenGLContext

fn create_buffer(&mut self, size: usize, usage: BufferUsage) -> BufferHandle

Create a GPU buffer and return its handle.

fn create_texture( &mut self, width: u32, height: u32, format: TextureFormat, ) -> TextureHandle

Create a 2-D texture.

fn create_shader(&mut self, source: &str, stage: ShaderStage) -> ShaderHandle

Compile / upload a shader module.

fn create_pipeline( &mut self, vertex: ShaderHandle, fragment: ShaderHandle, layout: &PipelineLayout, ) -> PipelineHandle

Create a render pipeline (vertex + fragment).

fn create_compute_pipeline( &mut self, shader: ShaderHandle, layout: &PipelineLayout, ) -> ComputePipelineHandle

Create a compute pipeline.

fn submit(&mut self, commands: &[GpuCommand])

Submit a batch of GPU commands.

fn present(&mut self)

Present the current frame to screen.

fn write_buffer(&mut self, buffer: BufferHandle, data: &[u8])

Write raw data into a buffer.

fn read_buffer(&self, buffer: BufferHandle) -> Vec<u8>

Read raw data back from a buffer.

fn write_texture(&mut self, texture: TextureHandle, data: &[u8])

Write raw pixel data into a texture.

fn read_texture(&self, texture: TextureHandle) -> Vec<u8>

Read raw pixel data from a texture.

fn destroy_buffer(&mut self, buffer: BufferHandle)

Destroy a buffer, freeing its resources.

fn destroy_texture(&mut self, texture: TextureHandle)

Destroy a texture, freeing its resources.

fn name(&self) -> &str

Name of this backend, for logging.

impl Default for OpenGLContext

fn default() -> Self

Returns the “default value” for a type.