Function WriteLightInstanceData

engine/render/src/render/light.cpp:276–307

    }

    static void WriteLightInstanceData(HRenderContext render_context)
    {
        // The light count has changed, we need to write that separately
        if (render_context->m_LightBufferDirtyCount)
        {
            // ... but only if it is actually different from last write.
            float count = (float) render_context->m_RenderLightsIndices.Size();
            if (count != render_context->m_LightBufferLastWrittenCount)
            {
                dmGraphics::SetUniformBuffer(render_context->m_GraphicsContext, render_context->m_LightUniformBuffer, 0, sizeof(float), &count);
            }
            render_context->m_LightBufferLastWrittenCount = count;
        }

        // Write the light data from the scratch buffer
        if (render_context->m_LightBufferDirtyEnd > render_context->m_LightBufferDirtyStart)
        {
            // Convert indices to byte offsets
            uint32_t write_light_data_start = render_context->m_LightBufferDataWriteStart;
            uint32_t write_start            = write_light_data_start + render_context->m_LightBufferDirtyStart * sizeof(LightSTD140);
            uint32_t write_end              = write_light_data_start + render_context->m_LightBufferDirtyEnd * sizeof(LightSTD140);
            uint32_t write_size             = write_end - write_start;
            LightSTD140* write_ptr_start    = &render_context->m_LightBufferScratch[render_context->m_LightBufferDirtyStart];

            dmGraphics::SetUniformBuffer(render_context->m_GraphicsContext, render_context->m_LightUniformBuffer, write_start, write_size, (void*) write_ptr_start);
        }

        // Reset all dirty flags
        render_context->m_LightBufferDirtyStart = render_context->m_LightBufferScratch.Size();
        render_context->m_LightBufferDirtyEnd   = 0;
        render_context->m_LightBufferDirtyCount = 0;
    }

    static inline bool IsLightBufferDirty(HRenderContext render_context)
    {