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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2020, Blender Foundation.
*/
/** \file
* \ingroup gpu
*/
#pragma once
#include "BLI_utildefines.h"
#include "GPU_state.h"
#include <cstring>
namespace blender {
namespace gpu {
/* Ecapsulate all pipeline state that we need to track.
* Try to keep small to reduce validation time. */
union GPUState {
struct {
eGPUWriteMask write_mask : 13;
eGPUBlend blend : 4;
eGPUFaceCullTest culling_test : 2;
eGPUDepthTest depth_test : 3;
eGPUStencilTest stencil_test : 3;
eGPUStencilOp stencil_op : 3;
eGPUProvokingVertex provoking_vert : 1;
/** Enable bits. */
uint32_t logic_op_xor : 1;
uint32_t invert_facing : 1;
uint32_t shadow_bias : 1;
/** Number of clip distances enabled. */
/* TODO(fclem) This should be a shader property. */
uint32_t clip_distances : 3;
/* TODO(fclem) remove, old opengl features. */
uint32_t polygon_smooth : 1;
uint32_t line_smooth : 1;
};
/* Here to allow fast bitwise ops. */
uint64_t data;
};
BLI_STATIC_ASSERT(sizeof(GPUState) == sizeof(uint64_t), "GPUState is too big.");
inline bool operator==(const GPUState &a, const GPUState &b)
{
return a.data == b.data;
}
inline bool operator!=(const GPUState &a, const GPUState &b)
{
return !(a == b);
}
inline GPUState operator^(const GPUState &a, const GPUState &b)
{
GPUState r;
r.data = a.data ^ b.data;
return r;
}
/* Mutable state that does not require pipeline change. */
union GPUStateMutable {
struct {
/** Offset + Extent of the drawable region inside the framebuffer. */
int viewport_rect[4];
/** Offset + Extent of the scissor region inside the framebuffer. */
int scissor_rect[4];
/** TODO remove */
float depth_range[2];
/** TODO remove, use explicit clear calls. */
float clear_color[4];
float clear_depth;
/** Negative if using program point size. */
/* TODO(fclem) should be passed as uniform to all shaders. */
float point_size;
/** Not supported on every platform. Prefer using wideline shader. */
float line_width;
/** Mutable stencil states. */
uint8_t stencil_write_mask;
uint8_t stencil_compare_mask;
uint8_t stencil_reference;
uint8_t _pad0;
/* IMPORTANT: ensure x64 stuct alignment. */
};
/* Here to allow fast bitwise ops. */
uint64_t data[9];
};
BLI_STATIC_ASSERT(sizeof(GPUStateMutable) == sizeof(GPUStateMutable::data),
"GPUStateMutable is too big.");
inline bool operator==(const GPUStateMutable &a, const GPUStateMutable &b)
{
return memcmp(&a, &b, sizeof(GPUStateMutable)) == 0;
}
inline bool operator!=(const GPUStateMutable &a, const GPUStateMutable &b)
{
return !(a == b);
}
inline GPUStateMutable operator^(const GPUStateMutable &a, const GPUStateMutable &b)
{
GPUStateMutable r;
for (int i = 0; i < ARRAY_SIZE(a.data); i++) {
r.data[i] = a.data[i] ^ b.data[i];
}
return r;
}
#define GPU_STATE_STACK_LEN 4
class GPUStateStack {
private:
/** Stack of state for quick temporary modification of the state. */
GPUState stack[GPU_STATE_STACK_LEN];
GPUStateMutable mutable_stack[GPU_STATE_STACK_LEN];
int stack_top = 0;
int mutable_stack_top = 0;
public:
virtual void set_state(GPUState &state) = 0;
virtual void set_mutable_state(GPUStateMutable &state) = 0;
void push_stack(void);
void pop_stack(void);
void push_mutable_stack(void);
void pop_mutable_stack(void);
inline GPUState &stack_top_get(void);
inline GPUStateMutable &mutable_stack_top_get(void);
};
inline GPUState &GPUStateStack::stack_top_get(void)
{
return stack[stack_top];
}
inline GPUStateMutable &GPUStateStack::mutable_stack_top_get(void)
{
return mutable_stack[mutable_stack_top];
}
} // namespace gpu
} // namespace blender
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