/* "Null" renderer implementation.
 * Useful for headless testing */

#include "gfx/renderer_api.h"
#include "runtime/runtime.h"

#include "../common/common_render_graph.h"

#define RETURN_HANDLE_STUB2(type, initial)                                                         \
    static unsigned int s_next = (initial);                                                        \
    return (type) { .index = (s_next++) % RT_RENDER_BACKEND_HANDLE_MAX_INDEX, .version = 1 }

#define RETURN_HANDLE_STUB(type) RETURN_HANDLE_STUB2(type, 1)

#define RETURN_HANDLE_ARRAY_STUB2(out, count, initial)                                             \
    static unsigned int s_next = (initial);                                                        \
    for (uint32_t i = 0; i < (count); ++i) {                                                       \
        (out)[i].index   = (s_next++) % RT_RENDER_BACKEND_HANDLE_MAX_INDEX;                        \
        (out)[i].version = 1;                                                                      \
    }

#define RETURN_HANDLE_ARRAY_STUB(out, count) RETURN_HANDLE_ARRAY_STUB2(out, count, 1)

void RT_RENDERER_API_FN(RegisterCVars)(void) {
}

rt_result RT_RENDERER_API_FN(Init)(const rt_renderer_init_info *info) {
    RT_UNUSED(info);
    return RT_SUCCESS;
}

void RT_RENDERER_API_FN(Shutdown)(void) {
}

unsigned int RT_RENDERER_API_FN(GetMaxFramesInFlight)(void) {
    return 2;
}

void RT_RENDERER_API_FN(BeginFrame)(unsigned int frame_id) {
    RT_UNUSED(frame_id);
}

void RT_RENDERER_API_FN(EndFrame)(unsigned int frame_id) {
    RT_UNUSED(frame_id);
}

rt_pipeline_handle RT_RENDERER_API_FN(CompilePipeline)(const rt_pipeline_info *info) {
    RT_UNUSED(info);
    RETURN_HANDLE_STUB(rt_pipeline_handle);
}

void RT_RENDERER_API_FN(DestroyPipeline)(rt_pipeline_handle handle) {
    RT_UNUSED(handle);
}

rt_result RT_RENDERER_API_FN(AllocCommandBuffers)(uint32_t count,
                                                  const rt_alloc_command_buffer_info *info,
                                                  rt_command_buffer_handle *p_command_buffers) {
    RT_UNUSED(info);
    RETURN_HANDLE_ARRAY_STUB(p_command_buffers, count)
    return RT_SUCCESS;
}

rt_result RT_RENDERER_API_FN(SubmitCommandBuffers)(rt_gpu_queue queue,
                                                   const rt_submit_command_buffers_info *info) {
    RT_UNUSED(queue);
    RT_UNUSED(info);
    return RT_SUCCESS;
}

rt_result RT_RENDERER_API_FN(CreateBuffers)(uint32_t count,
                                            const rt_buffer_info *info,
                                            rt_buffer_handle *p_buffers) {
    RT_UNUSED(info);
    RETURN_HANDLE_ARRAY_STUB(p_buffers, count);
    return RT_SUCCESS;
}

void RT_RENDERER_API_FN(DestroyBuffers)(uint32_t count, rt_buffer_handle *buffers) {
    RT_UNUSED(count);
    RT_UNUSED(buffers);
}

void RT_RENDERER_API_FN(CmdBeginPass)(rt_command_buffer_handle cmd,
                                      const rt_cmd_begin_pass_info *info) {
    RT_UNUSED(cmd);
    RT_UNUSED(info);
}

void RT_RENDERER_API_FN(CmdEndPass)(rt_command_buffer_handle cmd) {
    RT_UNUSED(cmd);
}

void RT_RENDERER_API_FN(CmdTransitionRenderTarget)(rt_command_buffer_handle cmd,
                                                   rt_render_target_handle target,
                                                   rt_render_target_state state) {
    RT_UNUSED(cmd);
    RT_UNUSED(target);
    RT_UNUSED(state);
}

void RT_RENDERER_API_FN(CmdFlushRenderTargetWrite)(rt_command_buffer_handle cmdbuf_handle,
                                                   rt_render_target_handle render_target) {
    RT_UNUSED(cmdbuf_handle);
    RT_UNUSED(render_target);
}

static rt_render_target_handle CreateRenderTarget(const rt_physical_render_target_info *info) {
    RETURN_HANDLE_STUB(rt_render_target_handle);
}

static int RequireExplicitSync(void) {
    return 0;
}

rt_render_graph_builder RT_RENDERER_API_FN(CreateRenderGraphBuilder)(void) {
    rt_render_graph_builder_platform_callbacks cbs = {.CreateRenderTarget = CreateRenderTarget,
                                                      .RequireExplicitSynchronization =
                                                          RequireExplicitSync};
    return rtCreateRenderGraphBuilder(&cbs);
}

void RT_RENDERER_API_FN(DestroyRenderGraphBuilder)(rt_render_graph_builder *builder) {
    rtDestroyRenderGraphBuilder(builder);
}

rt_result RT_RENDERER_API_FN(ExecuteRenderGraph)(rt_render_graph *render_graph) {
    RT_UNUSED(render_graph);
    return RT_SUCCESS;
}

void RT_RENDERER_API_FN(SubmitRenderView)(rt_render_graph *render_graph,
                                          uint32_t pass_id,
                                          rt_render_view view,
                                          unsigned int frame_id) {
    RT_UNUSED(render_graph);
    RT_UNUSED(pass_id);
    RT_UNUSED(view);
    RT_UNUSED(frame_id);
}

void RT_RENDERER_API_FN(ResetRenderGraph)(rt_render_graph *graph) {
    RT_UNUSED(graph);
}

void RT_RENDERER_API_FN(CmdBindPipeline)(rt_command_buffer_handle cmdhandle,
                                         rt_pipeline_handle pipeline_handle) {
}

void RT_RENDERER_API_FN(CmdBindVertexBuffers)(rt_command_buffer_handle cmdhandle,
                                              uint32_t first_binding,
                                              uint32_t count,
                                              const rt_buffer_handle *buffers,
                                              const uint64_t *_offsets) {
}
void RT_RENDERER_API_FN(CmdDraw)(rt_command_buffer_handle cmdhandle,
                                 uint32_t first,
                                 uint32_t count) {
}