sokol_command_queue.h

#ifndef soluna_render_h
#define soluna_render_h

#include <stdint.h>
#include "sokol/sokol_gfx.h"

#define SOKOL_COMMAND_INVALID 0
#define SOKOL_COMMAND_MAKE 1
#define SOKOL_COMMAND_PASS 2
#define SOKOL_COMMAND_UPDATE 3
#define SOKOL_COMMAND_APPLY 4
#define SOKOL_COMMAND_DRAW 5
#define SOKOL_COMMAND_DRAW_INSTANCE 6
#define SOKOL_COMMAND_UNIFORM_SET 7
#define SOKOL_COMMAND_UNIFORM_SET_RANGE 8

#define SOKOL_DESC_INVALID 0
#define SOKOL_DESC_BUFFER 1
#define SOKOL_DESC_IMAGE 2
#define SOKOL_DESC_SAMPLER 3
#define SOKOL_DESC_SHADER 4
#define SOKOL_DESC_PIPELINE 5
#define SOKOL_DESC_ATTACHMENTS 6
#define SOKOL_BINDINGS 7
#define SOKOL_UNIFORM 8

#define SOKOL_MAX_HANDLE 4096
#define SOKOL_MAX_PASS 16
#define SOKOL_MAX_UPDATE 4096
#define SOKOL_MAX_BINDINGS 4096
#define SOKOL_MAX_UNIFORM 256

union render_desc_buffer {
	struct sg_buffer_desc buffer;
	struct sg_image_desc image;
	struct sg_sampler_desc sampler;
	struct sg_shader_desc shader;
	struct sg_pipeline_desc pipeline;
	struct sg_attachments_desc attachments;
};

struct render_command_make {
	uint32_t id;	// high 8bit (type) / low 24bit base 0 id 
	int index;		// index of desc buffer
};

struct render_command_pass {
	uint32_t id;	// 0 for end
};

struct render_command_update {
	uint32_t id;
	uint16_t index;
	uint8_t cubeface;
	uint8_t mipmap;
};

struct render_command_apply {
	int index;
	uint16_t ub_slot;
	uint16_t ub_size;
};

struct render_command_draw {
	int base;
	int elem;
};

struct render_command_draw_instance {
	int inst;
};

union render_command_arg {
	struct render_command_make make;
	struct render_command_pass pass;
	struct render_command_update update;
	struct render_command_pipeline pipeline;
	struct render_command_apply apply;
	struct render_command_draw draw;
	struct render_command_draw_instance inst;
};

struct render_command {
	int type;
	union render_command_arg arg;
};

struct render_command_queue {
	int ready;
	int cmd_cap;
	int cmd_n;
	int desc_cap; 
	int desc_n;
	int bindings_n;
	int range_count;
	int range_reserve;
	int uniform_size;
	struct sg_bindings[SOKOL_MAX_BINDINGS];
	struct sg_range[SOKOL_MAX_UPDATE];
	struct sg_range uniform;
	struct render_command *cmd;
	union render_desc_buffer *desc;
};

struct render_command_queue;

struct render_context {
	int id_count;
	int pass_count;
	uint32_t id_map[SOKOL_MAX_HANDLE];
	struct sg_pass[SOKOL_MAX_PASS];
	struct render_command_queue *q[2];
};

void render_init(struct render_context *ctx);
void render_deinit(struct render_context *ctx);

struct sg_buffer_desc * render_make_buffer(struct render_command_queue *q, uint32_t *id);
struct sg_image_desc * render_make_image(struct render_command_queue *q, uint32_t *id);
struct sg_sampler_desc * render_make_sampler(struct render_command_queue *q, uint32_t *id);
struct sg_shader_desc * render_make_shader(struct render_command_queue *q, uint32_t *id);
struct sg_pipeline_desc * render_make_pipeline(struct render_command_queue *q, uint32_t *id);
struct sg_attachments_desc * render_make_attachments(struct render_command_queue *q, uint32_t *id);
struct sg_pass * render_pass_new(struct render_context *ctx, uint32_t *id);

void render_pass_begin(struct render_command_queue *q, uint32_t id);
void render_pass_end(struct render_command_queue *q);
void render_update_buffer(struct render_command_queue *q, uint32_t id, sg_range *r);
void render_update_image(struct render_command_queue *q, uint32_t id, sg_image_data* data);

void render_apply_uniform(struct render_command_queue *q, int ub_slot, const sg_range *r);
void render_apply_bindings(struct render_command_queue *q, const sg_bindings* bindings);
void render_apply_pipeline(struct render_command_queue *q, uint32_t pip);

struct render_draw(struct render_command_queue *q, int base, int elem, int inst);

void render_command_submit(struct render_command_queue *q);	// for command thread
void render_command_apply(struct render_context *ctx);	// for render thread

#endif