Route Texture2D through renderer GL

src/renderer_gl/opengl_capabilities.h

@@ -110,6 +110,37 @@ struct OpenGlRendererTextureFormat {
     std::uint32_t bytes_per_pixel = 0;
 };
 
+struct OpenGlTexture2DAllocation {
+    std::int32_t width = 0;
+    std::int32_t height = 0;
+    std::int32_t internal_format = 0;
+    std::uint32_t pixel_format = 0;
+    std::uint32_t component_type = 0;
+    const void* data = nullptr;
+};
+
+struct OpenGlTexture2DUpdate {
+    std::uint32_t texture_id = 0;
+    std::int32_t width = 0;
+    std::int32_t height = 0;
+    std::uint32_t pixel_format = 0;
+    std::uint32_t component_type = 0;
+    const void* data = nullptr;
+};
+
+struct OpenGlTexture2DReadback {
+    std::uint32_t texture_id = 0;
+    std::int32_t width = 0;
+    std::int32_t height = 0;
+    OpenGlReadbackFormat format;
+    void* pixels = nullptr;
+};
+
+struct OpenGlTexture2DReadbackResult {
+    std::uint32_t framebuffer_status = 0;
+    bool pixels_read = false;
+};
+
 struct OpenGlWindowsWglContextConfig {
     std::array<std::int32_t, 9> context_attributes {};
     std::array<std::int32_t, 15> pixel_format_attributes {};
@@ -154,6 +185,44 @@ using OpenGlUseProgramFn = void (*)(std::uint32_t program) noexcept;
 using OpenGlBindFramebufferFn = void (*)(std::uint32_t target, std::uint32_t framebuffer) noexcept;
 using OpenGlBindTextureFn = void (*)(std::uint32_t target, std::uint32_t texture) noexcept;
 using OpenGlBindSamplerFn = void (*)(std::uint32_t unit, std::uint32_t sampler) noexcept;
+using OpenGlGenObjectsFn = void (*)(std::uint32_t count, std::uint32_t* ids) noexcept;
+using OpenGlDeleteObjectsFn = void (*)(std::uint32_t count, const std::uint32_t* ids) noexcept;
+using OpenGlTexImage2DFn = void (*)(
+    std::uint32_t target,
+    std::int32_t level,
+    std::int32_t internal_format,
+    std::int32_t width,
+    std::int32_t height,
+    std::int32_t border,
+    std::uint32_t pixel_format,
+    std::uint32_t component_type,
+    const void* data) noexcept;
+using OpenGlTexSubImage2DFn = void (*)(
+    std::uint32_t target,
+    std::int32_t level,
+    std::int32_t x,
+    std::int32_t y,
+    std::int32_t width,
+    std::int32_t height,
+    std::uint32_t pixel_format,
+    std::uint32_t component_type,
+    const void* data) noexcept;
+using OpenGlGenerateMipmapFn = void (*)(std::uint32_t target) noexcept;
+using OpenGlFramebufferTexture2DFn = void (*)(
+    std::uint32_t target,
+    std::uint32_t attachment,
+    std::uint32_t texture_target,
+    std::uint32_t texture,
+    std::int32_t level) noexcept;
+using OpenGlCheckFramebufferStatusFn = std::uint32_t (*)(std::uint32_t target) noexcept;
+using OpenGlReadPixelsFn = void (*)(
+    std::int32_t x,
+    std::int32_t y,
+    std::int32_t width,
+    std::int32_t height,
+    std::uint32_t pixel_format,
+    std::uint32_t component_type,
+    void* pixels) noexcept;
 
 struct OpenGlStateDispatch {
     OpenGlCapabilityFn enable = nullptr;
@@ -228,6 +297,41 @@ struct OpenGlBufferClearDispatch {
     OpenGlClearFn clear = nullptr;
 };
 
+struct OpenGlTexture2DAllocationDispatch {
+    OpenGlGenObjectsFn gen_textures = nullptr;
+    OpenGlBindTextureFn bind_texture = nullptr;
+    OpenGlTexImage2DFn tex_image_2d = nullptr;
+};
+
+struct OpenGlTexture2DDeleteDispatch {
+    OpenGlDeleteObjectsFn delete_textures = nullptr;
+};
+
+struct OpenGlTexture2DBindDispatch {
+    OpenGlBindTextureFn bind_texture = nullptr;
+};
+
+struct OpenGlTexture2DUpdateDispatch {
+    OpenGlBindTextureFn bind_texture = nullptr;
+    OpenGlTexSubImage2DFn tex_sub_image_2d = nullptr;
+};
+
+struct OpenGlTexture2DMipmapDispatch {
+    OpenGlBindTextureFn bind_texture = nullptr;
+    OpenGlGenerateMipmapFn generate_mipmap = nullptr;
+};
+
+struct OpenGlTexture2DReadbackDispatch {
+    OpenGlBindTextureFn bind_texture = nullptr;
+    OpenGlGenObjectsFn gen_framebuffers = nullptr;
+    OpenGlGetIntegerFn get_integer = nullptr;
+    OpenGlBindFramebufferFn bind_framebuffer = nullptr;
+    OpenGlFramebufferTexture2DFn framebuffer_texture_2d = nullptr;
+    OpenGlCheckFramebufferStatusFn check_framebuffer_status = nullptr;
+    OpenGlReadPixelsFn read_pixels = nullptr;
+    OpenGlDeleteObjectsFn delete_framebuffers = nullptr;
+};
+
 [[nodiscard]] OpenGlCapabilities detect_opengl_capabilities(
     std::span<const std::string_view> extensions,
     OpenGlRuntime runtime) noexcept;
@@ -260,6 +364,24 @@ struct OpenGlBufferClearDispatch {
 [[nodiscard]] pp::foundation::Status clear_opengl_buffers(
     std::uint32_t mask,
     OpenGlBufferClearDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Result<std::uint32_t> allocate_opengl_texture_2d(
+    OpenGlTexture2DAllocation allocation,
+    OpenGlTexture2DAllocationDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Status delete_opengl_texture_2d(
+    std::uint32_t texture_id,
+    OpenGlTexture2DDeleteDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Status bind_opengl_texture_2d(
+    std::uint32_t texture_id,
+    OpenGlTexture2DBindDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Status update_opengl_texture_2d(
+    OpenGlTexture2DUpdate update,
+    OpenGlTexture2DUpdateDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Status generate_opengl_texture_2d_mipmaps(
+    std::uint32_t texture_id,
+    OpenGlTexture2DMipmapDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Result<OpenGlTexture2DReadbackResult> readback_opengl_texture_2d(
+    OpenGlTexture2DReadback readback,
+    OpenGlTexture2DReadbackDispatch dispatch) noexcept;
 
 [[nodiscard]] std::uint32_t extension_count_query() noexcept;
 [[nodiscard]] std::uint32_t extension_string_name() noexcept;