Route RTT texture updates through GL backend

src/rtt.cpp

@@ -92,6 +92,29 @@ void set_opengl_texture_2d_image(
         data);
 }
 
+void set_opengl_texture_2d_sub_image(
+    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
+{
+    glTexSubImage2D(
+        static_cast<GLenum>(target),
+        static_cast<GLint>(level),
+        static_cast<GLint>(x),
+        static_cast<GLint>(y),
+        static_cast<GLsizei>(width),
+        static_cast<GLsizei>(height),
+        static_cast<GLenum>(pixel_format),
+        static_cast<GLenum>(component_type),
+        data);
+}
+
 void set_opengl_texture_parameter_f(std::uint32_t target, std::uint32_t parameter, float value) noexcept
 {
     glTexParameterf(static_cast<GLenum>(target), static_cast<GLenum>(parameter), static_cast<GLfloat>(value));
@@ -760,6 +783,34 @@ bool RTT::readPixelsRgba8(int x, int y, int width, int height, void* buffer) con
     return ret;
 }
 
+bool RTT::updateRgba8(int x, int y, int width, int height, const void* data) noexcept
+{
+    if (!valid() || data == nullptr)
+        return false;
+
+    const auto status = pp::renderer::gl::update_opengl_texture_2d(
+        pp::renderer::gl::OpenGlTexture2DUpdate {
+            .texture_id = texID,
+            .x = x,
+            .y = y,
+            .width = width,
+            .height = height,
+            .pixel_format = pp::renderer::gl::rgba_pixel_format(),
+            .component_type = pp::renderer::gl::unsigned_byte_component_type(),
+            .data = data,
+        },
+        pp::renderer::gl::OpenGlTexture2DUpdateDispatch {
+            .bind_texture = bind_opengl_texture,
+            .tex_sub_image_2d = set_opengl_texture_2d_sub_image,
+        });
+    if (!status.ok()) {
+        LOG("RTT::updateRgba8() failed because: %s", status.message);
+        return false;
+    }
+    unbindTexture();
+    return true;
+}
+
 uint8_t* RTT::readTextureData(uint8_t* buffer) const noexcept
 {
     if (!valid())