#ifndef RT_GFX_EFFECT_H
#define RT_GFX_EFFECT_H

/* A effect lists the passes during which an object needs to be rendered
 * and a pipeline for each pass.
 * The effect also defines the required vertex layout per pass.
 */

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

/* *** Resource types *** */

typedef struct rt_pipeline_info_s {
    rt_resource_id vertex_shader;
    rt_resource_id fragment_shader;
    rt_resource_id compute_shader;

    /* TODO(Kevin): Fixed function settings */
} rt_pipeline_info;

typedef struct {
    /* Id of the render pass during which this effect pass is run. */
    uint32_t pass_id;
    rt_resource_id pipeline;
} rt_effect_pass_info;

typedef struct {
    uint32_t pass_count;
    rt_effect_pass_info passes[RT_MAX_SUBRESOURCES];
} rt_effect_info;

/* *** Runtime types *** */

typedef struct {
    uint32_t pass_id;
    rt_pipeline_handle pipeline;
} rt_effect_pass;

typedef struct {
    uint32_t pass_count;
    rt_effect_pass passes[RT_MAX_SUBRESOURCES];
} rt_effect;

RT_DLLEXPORT uint32_t rtCalculateRenderTargetID(const char *name, size_t len);
RT_DLLEXPORT uint32_t rtCalculateRenderPassID(const char *name, size_t len);

/* Load an effect from a resource file.
 * Returns:
 * - RT_SUCCESS
 * - RT_OUT_OF_MEMORY, if temporary memory allocations failed
 * - RT_INVALID_VALUE, if id does not refer to an effect resource.
 * - RT_UNKNOWN_ERROR, if a pipeline failed to compile
 * - errors returned by rtGetResource() */
RT_DLLEXPORT rt_result rtLoadEffect(rt_resource_id id, const rt_effect **effect);

RT_DLLEXPORT void rtReleaseEffect(const rt_effect *effect);

#endif