666 lines
17 KiB
C++
666 lines
17 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2020, Blender Foundation.
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*/
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/** \file
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* \ingroup gpu
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*/
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#include "BKE_global.h"
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#include "BLI_math_base.h"
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#include "BLI_math_bits.h"
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#include "GPU_capabilities.h"
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#include "glew-mx.h"
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#include "gl_context.hh"
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#include "gl_debug.hh"
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#include "gl_framebuffer.hh"
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#include "gl_texture.hh"
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#include "gl_state.hh"
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namespace blender::gpu {
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/* -------------------------------------------------------------------- */
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/** \name GLStateManager
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* \{ */
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GLStateManager::GLStateManager()
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{
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/* Set other states that never change. */
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glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
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glEnable(GL_MULTISAMPLE);
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glEnable(GL_PRIMITIVE_RESTART);
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glDisable(GL_DITHER);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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glPrimitiveRestartIndex((GLuint)0xFFFFFFFF);
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/* TODO: Should become default. But needs at least GL 4.3 */
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if (GLContext::fixed_restart_index_support) {
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/* Takes precedence over #GL_PRIMITIVE_RESTART. */
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glEnable(GL_PRIMITIVE_RESTART_FIXED_INDEX);
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}
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/* Limits. */
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glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, line_width_range_);
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/* Force update using default state. */
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current_ = ~state;
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current_mutable_ = ~mutable_state;
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set_state(state);
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set_mutable_state(mutable_state);
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}
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void GLStateManager::apply_state()
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{
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if (!this->use_bgl) {
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this->set_state(this->state);
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this->set_mutable_state(this->mutable_state);
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this->texture_bind_apply();
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this->image_bind_apply();
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}
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/* This is needed by gpu_py_offscreen. */
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active_fb->apply_state();
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};
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/* Will set all the states regardless of the current ones. */
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void GLStateManager::force_state()
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{
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/* Little exception for clip distances since they need to keep the old count correct. */
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uint32_t clip_distances = current_.clip_distances;
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current_ = ~this->state;
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current_.clip_distances = clip_distances;
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current_mutable_ = ~this->mutable_state;
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this->set_state(this->state);
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this->set_mutable_state(this->mutable_state);
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};
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void GLStateManager::set_state(const GPUState &state)
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{
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GPUState changed = state ^ current_;
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if (changed.blend != 0) {
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set_blend((eGPUBlend)state.blend);
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}
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if (changed.write_mask != 0) {
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set_write_mask((eGPUWriteMask)state.write_mask);
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}
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if (changed.depth_test != 0) {
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set_depth_test((eGPUDepthTest)state.depth_test);
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}
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if (changed.stencil_test != 0 || changed.stencil_op != 0) {
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set_stencil_test((eGPUStencilTest)state.stencil_test, (eGPUStencilOp)state.stencil_op);
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set_stencil_mask((eGPUStencilTest)state.stencil_test, mutable_state);
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}
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if (changed.clip_distances != 0) {
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set_clip_distances(state.clip_distances, current_.clip_distances);
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}
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if (changed.culling_test != 0) {
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set_backface_culling((eGPUFaceCullTest)state.culling_test);
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}
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if (changed.logic_op_xor != 0) {
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set_logic_op(state.logic_op_xor);
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}
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if (changed.invert_facing != 0) {
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set_facing(state.invert_facing);
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}
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if (changed.provoking_vert != 0) {
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set_provoking_vert((eGPUProvokingVertex)state.provoking_vert);
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}
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if (changed.shadow_bias != 0) {
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set_shadow_bias(state.shadow_bias);
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}
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/* TODO remove */
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if (changed.polygon_smooth) {
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if (state.polygon_smooth) {
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glEnable(GL_POLYGON_SMOOTH);
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}
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else {
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glDisable(GL_POLYGON_SMOOTH);
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}
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}
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if (changed.line_smooth) {
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if (state.line_smooth) {
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glEnable(GL_LINE_SMOOTH);
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}
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else {
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glDisable(GL_LINE_SMOOTH);
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}
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}
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current_ = state;
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}
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void GLStateManager::set_mutable_state(const GPUStateMutable &state)
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{
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GPUStateMutable changed = state ^ current_mutable_;
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/* TODO remove, should be uniform. */
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if (float_as_uint(changed.point_size) != 0) {
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if (state.point_size > 0.0f) {
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glEnable(GL_PROGRAM_POINT_SIZE);
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}
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else {
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glDisable(GL_PROGRAM_POINT_SIZE);
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glPointSize(fabsf(state.point_size));
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}
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}
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if (changed.line_width != 0) {
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/* TODO remove, should use wide line shader. */
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glLineWidth(clamp_f(state.line_width, line_width_range_[0], line_width_range_[1]));
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}
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if (changed.depth_range[0] != 0 || changed.depth_range[1] != 0) {
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/* TODO remove, should modify the projection matrix instead. */
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glDepthRange(UNPACK2(state.depth_range));
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}
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if (changed.stencil_compare_mask != 0 || changed.stencil_reference != 0 ||
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changed.stencil_write_mask != 0) {
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set_stencil_mask((eGPUStencilTest)current_.stencil_test, state);
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}
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current_mutable_ = state;
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}
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/** \} */
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/* -------------------------------------------------------------------- */
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/** \name State set functions
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* \{ */
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void GLStateManager::set_write_mask(const eGPUWriteMask value)
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{
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glDepthMask((value & GPU_WRITE_DEPTH) != 0);
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glColorMask((value & GPU_WRITE_RED) != 0,
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(value & GPU_WRITE_GREEN) != 0,
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(value & GPU_WRITE_BLUE) != 0,
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(value & GPU_WRITE_ALPHA) != 0);
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if (value == GPU_WRITE_NONE) {
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glEnable(GL_RASTERIZER_DISCARD);
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}
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else {
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glDisable(GL_RASTERIZER_DISCARD);
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}
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}
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void GLStateManager::set_depth_test(const eGPUDepthTest value)
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{
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GLenum func;
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switch (value) {
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case GPU_DEPTH_LESS:
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func = GL_LESS;
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break;
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case GPU_DEPTH_LESS_EQUAL:
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func = GL_LEQUAL;
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break;
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case GPU_DEPTH_EQUAL:
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func = GL_EQUAL;
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break;
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case GPU_DEPTH_GREATER:
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func = GL_GREATER;
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break;
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case GPU_DEPTH_GREATER_EQUAL:
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func = GL_GEQUAL;
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break;
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case GPU_DEPTH_ALWAYS:
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default:
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func = GL_ALWAYS;
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break;
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}
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if (value != GPU_DEPTH_NONE) {
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(func);
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}
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else {
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glDisable(GL_DEPTH_TEST);
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}
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}
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void GLStateManager::set_stencil_test(const eGPUStencilTest test, const eGPUStencilOp operation)
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{
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switch (operation) {
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case GPU_STENCIL_OP_REPLACE:
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glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
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break;
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case GPU_STENCIL_OP_COUNT_DEPTH_PASS:
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glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
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glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
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break;
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case GPU_STENCIL_OP_COUNT_DEPTH_FAIL:
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glStencilOpSeparate(GL_BACK, GL_KEEP, GL_DECR_WRAP, GL_KEEP);
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glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_INCR_WRAP, GL_KEEP);
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break;
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case GPU_STENCIL_OP_NONE:
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default:
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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}
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if (test != GPU_STENCIL_NONE) {
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glEnable(GL_STENCIL_TEST);
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}
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else {
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glDisable(GL_STENCIL_TEST);
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}
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}
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void GLStateManager::set_stencil_mask(const eGPUStencilTest test, const GPUStateMutable state)
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{
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GLenum func;
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switch (test) {
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case GPU_STENCIL_NEQUAL:
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func = GL_NOTEQUAL;
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break;
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case GPU_STENCIL_EQUAL:
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func = GL_EQUAL;
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break;
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case GPU_STENCIL_ALWAYS:
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func = GL_ALWAYS;
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break;
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case GPU_STENCIL_NONE:
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default:
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glStencilMask(0x00);
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glStencilFunc(GL_ALWAYS, 0x00, 0x00);
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return;
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}
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glStencilMask(state.stencil_write_mask);
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glStencilFunc(func, state.stencil_reference, state.stencil_compare_mask);
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}
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void GLStateManager::set_clip_distances(const int new_dist_len, const int old_dist_len)
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{
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for (int i = 0; i < new_dist_len; i++) {
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glEnable(GL_CLIP_DISTANCE0 + i);
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}
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for (int i = new_dist_len; i < old_dist_len; i++) {
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glDisable(GL_CLIP_DISTANCE0 + i);
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}
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}
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void GLStateManager::set_logic_op(const bool enable)
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{
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if (enable) {
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glEnable(GL_COLOR_LOGIC_OP);
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glLogicOp(GL_XOR);
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}
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else {
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glDisable(GL_COLOR_LOGIC_OP);
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}
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}
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void GLStateManager::set_facing(const bool invert)
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{
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glFrontFace((invert) ? GL_CW : GL_CCW);
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}
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void GLStateManager::set_backface_culling(const eGPUFaceCullTest test)
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{
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if (test != GPU_CULL_NONE) {
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glEnable(GL_CULL_FACE);
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glCullFace((test == GPU_CULL_FRONT) ? GL_FRONT : GL_BACK);
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}
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else {
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glDisable(GL_CULL_FACE);
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}
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}
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void GLStateManager::set_provoking_vert(const eGPUProvokingVertex vert)
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{
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GLenum value = (vert == GPU_VERTEX_FIRST) ? GL_FIRST_VERTEX_CONVENTION :
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GL_LAST_VERTEX_CONVENTION;
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glProvokingVertex(value);
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}
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void GLStateManager::set_shadow_bias(const bool enable)
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{
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if (enable) {
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glEnable(GL_POLYGON_OFFSET_FILL);
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glEnable(GL_POLYGON_OFFSET_LINE);
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/* 2.0 Seems to be the lowest possible slope bias that works in every case. */
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glPolygonOffset(2.0f, 1.0f);
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}
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else {
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glDisable(GL_POLYGON_OFFSET_FILL);
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glDisable(GL_POLYGON_OFFSET_LINE);
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}
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}
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void GLStateManager::set_blend(const eGPUBlend value)
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{
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/**
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* Factors to the equation.
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* SRC is fragment shader output.
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* DST is frame-buffer color.
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* final.rgb = SRC.rgb * src_rgb + DST.rgb * dst_rgb;
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* final.a = SRC.a * src_alpha + DST.a * dst_alpha;
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*/
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GLenum src_rgb, src_alpha, dst_rgb, dst_alpha;
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switch (value) {
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default:
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case GPU_BLEND_ALPHA: {
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src_rgb = GL_SRC_ALPHA;
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dst_rgb = GL_ONE_MINUS_SRC_ALPHA;
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src_alpha = GL_ONE;
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dst_alpha = GL_ONE_MINUS_SRC_ALPHA;
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break;
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}
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case GPU_BLEND_ALPHA_PREMULT: {
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src_rgb = GL_ONE;
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dst_rgb = GL_ONE_MINUS_SRC_ALPHA;
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src_alpha = GL_ONE;
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dst_alpha = GL_ONE_MINUS_SRC_ALPHA;
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break;
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}
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case GPU_BLEND_ADDITIVE: {
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/* Do not let alpha accumulate but premult the source RGB by it. */
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src_rgb = GL_SRC_ALPHA;
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dst_rgb = GL_ONE;
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src_alpha = GL_ZERO;
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dst_alpha = GL_ONE;
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break;
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}
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case GPU_BLEND_SUBTRACT:
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case GPU_BLEND_ADDITIVE_PREMULT: {
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/* Let alpha accumulate. */
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src_rgb = GL_ONE;
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dst_rgb = GL_ONE;
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src_alpha = GL_ONE;
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dst_alpha = GL_ONE;
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break;
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}
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case GPU_BLEND_MULTIPLY: {
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src_rgb = GL_DST_COLOR;
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dst_rgb = GL_ZERO;
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src_alpha = GL_DST_ALPHA;
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dst_alpha = GL_ZERO;
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break;
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}
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case GPU_BLEND_INVERT: {
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src_rgb = GL_ONE_MINUS_DST_COLOR;
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dst_rgb = GL_ZERO;
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src_alpha = GL_ZERO;
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dst_alpha = GL_ONE;
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break;
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}
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case GPU_BLEND_OIT: {
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src_rgb = GL_ONE;
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dst_rgb = GL_ONE;
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src_alpha = GL_ZERO;
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dst_alpha = GL_ONE_MINUS_SRC_ALPHA;
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break;
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}
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case GPU_BLEND_BACKGROUND: {
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src_rgb = GL_ONE_MINUS_DST_ALPHA;
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dst_rgb = GL_SRC_ALPHA;
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src_alpha = GL_ZERO;
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dst_alpha = GL_SRC_ALPHA;
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break;
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}
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case GPU_BLEND_ALPHA_UNDER_PREMUL: {
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src_rgb = GL_ONE_MINUS_DST_ALPHA;
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dst_rgb = GL_ONE;
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src_alpha = GL_ONE_MINUS_DST_ALPHA;
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dst_alpha = GL_ONE;
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break;
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}
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case GPU_BLEND_CUSTOM: {
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src_rgb = GL_ONE;
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dst_rgb = GL_SRC1_COLOR;
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src_alpha = GL_ONE;
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dst_alpha = GL_SRC1_ALPHA;
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break;
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}
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}
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if (value == GPU_BLEND_SUBTRACT) {
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glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
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}
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else {
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glBlendEquation(GL_FUNC_ADD);
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}
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/* Always set the blend function. This avoid a rendering error when blending is disabled but
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* GPU_BLEND_CUSTOM was used just before and the frame-buffer is using more than 1 color target.
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*/
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glBlendFuncSeparate(src_rgb, dst_rgb, src_alpha, dst_alpha);
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if (value != GPU_BLEND_NONE) {
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glEnable(GL_BLEND);
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}
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else {
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glDisable(GL_BLEND);
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}
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}
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/** \} */
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/* -------------------------------------------------------------------- */
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/** \name Texture State Management
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* \{ */
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void GLStateManager::texture_bind(Texture *tex_, eGPUSamplerState sampler_type, int unit)
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{
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BLI_assert(unit < GPU_max_textures());
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GLTexture *tex = static_cast<GLTexture *>(tex_);
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if (G.debug & G_DEBUG_GPU) {
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tex->check_feedback_loop();
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}
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/* Eliminate redundant binds. */
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if ((textures_[unit] == tex->tex_id_) &&
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(samplers_[unit] == GLTexture::samplers_[sampler_type])) {
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return;
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}
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targets_[unit] = tex->target_;
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textures_[unit] = tex->tex_id_;
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samplers_[unit] = GLTexture::samplers_[sampler_type];
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tex->is_bound_ = true;
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dirty_texture_binds_ |= 1ULL << unit;
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}
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/* Bind the texture to slot 0 for editing purpose. Used by legacy pipeline. */
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void GLStateManager::texture_bind_temp(GLTexture *tex)
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{
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(tex->target_, tex->tex_id_);
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/* Will reset the first texture that was originally bound to slot 0 back before drawing. */
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dirty_texture_binds_ |= 1ULL;
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/* NOTE: This might leave this texture attached to this target even after update.
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* In practice it is not causing problems as we have incorrect binding detection
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* at higher level. */
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}
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void GLStateManager::texture_unbind(Texture *tex_)
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{
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GLTexture *tex = static_cast<GLTexture *>(tex_);
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if (!tex->is_bound_) {
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return;
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}
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GLuint tex_id = tex->tex_id_;
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for (int i = 0; i < ARRAY_SIZE(textures_); i++) {
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if (textures_[i] == tex_id) {
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textures_[i] = 0;
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samplers_[i] = 0;
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dirty_texture_binds_ |= 1ULL << i;
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}
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}
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tex->is_bound_ = false;
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}
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void GLStateManager::texture_unbind_all()
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{
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for (int i = 0; i < ARRAY_SIZE(textures_); i++) {
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if (textures_[i] != 0) {
|
|
textures_[i] = 0;
|
|
samplers_[i] = 0;
|
|
dirty_texture_binds_ |= 1ULL << i;
|
|
}
|
|
}
|
|
this->texture_bind_apply();
|
|
}
|
|
|
|
void GLStateManager::texture_bind_apply()
|
|
{
|
|
if (dirty_texture_binds_ == 0) {
|
|
return;
|
|
}
|
|
uint64_t dirty_bind = dirty_texture_binds_;
|
|
dirty_texture_binds_ = 0;
|
|
|
|
int first = bitscan_forward_uint64(dirty_bind);
|
|
int last = 64 - bitscan_reverse_uint64(dirty_bind);
|
|
int count = last - first;
|
|
|
|
if (GLContext::multi_bind_support) {
|
|
glBindTextures(first, count, textures_ + first);
|
|
glBindSamplers(first, count, samplers_ + first);
|
|
}
|
|
else {
|
|
for (int unit = first; unit < last; unit++) {
|
|
if ((dirty_bind >> unit) & 1UL) {
|
|
glActiveTexture(GL_TEXTURE0 + unit);
|
|
glBindTexture(targets_[unit], textures_[unit]);
|
|
glBindSampler(unit, samplers_[unit]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void GLStateManager::texture_unpack_row_length_set(uint len)
|
|
{
|
|
glPixelStorei(GL_UNPACK_ROW_LENGTH, len);
|
|
}
|
|
|
|
uint64_t GLStateManager::bound_texture_slots()
|
|
{
|
|
uint64_t bound_slots = 0;
|
|
for (int i = 0; i < ARRAY_SIZE(textures_); i++) {
|
|
if (textures_[i] != 0) {
|
|
bound_slots |= 1ULL << i;
|
|
}
|
|
}
|
|
return bound_slots;
|
|
}
|
|
|
|
/** \} */
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/** \name Image Binding (from image load store)
|
|
* \{ */
|
|
|
|
void GLStateManager::image_bind(Texture *tex_, int unit)
|
|
{
|
|
/* Minimum support is 8 image in the fragment shader. No image for other stages. */
|
|
BLI_assert(GPU_shader_image_load_store_support() && unit < 8);
|
|
GLTexture *tex = static_cast<GLTexture *>(tex_);
|
|
if (G.debug & G_DEBUG_GPU) {
|
|
tex->check_feedback_loop();
|
|
}
|
|
images_[unit] = tex->tex_id_;
|
|
formats_[unit] = to_gl_internal_format(tex->format_);
|
|
tex->is_bound_ = true;
|
|
dirty_image_binds_ |= 1ULL << unit;
|
|
}
|
|
|
|
void GLStateManager::image_unbind(Texture *tex_)
|
|
{
|
|
GLTexture *tex = static_cast<GLTexture *>(tex_);
|
|
if (!tex->is_bound_) {
|
|
return;
|
|
}
|
|
|
|
GLuint tex_id = tex->tex_id_;
|
|
for (int i = 0; i < ARRAY_SIZE(images_); i++) {
|
|
if (images_[i] == tex_id) {
|
|
images_[i] = 0;
|
|
dirty_image_binds_ |= 1ULL << i;
|
|
}
|
|
}
|
|
tex->is_bound_ = false;
|
|
}
|
|
|
|
void GLStateManager::image_unbind_all()
|
|
{
|
|
for (int i = 0; i < ARRAY_SIZE(images_); i++) {
|
|
if (images_[i] != 0) {
|
|
images_[i] = 0;
|
|
dirty_image_binds_ |= 1ULL << i;
|
|
}
|
|
}
|
|
this->image_bind_apply();
|
|
}
|
|
|
|
void GLStateManager::image_bind_apply()
|
|
{
|
|
if (dirty_image_binds_ == 0) {
|
|
return;
|
|
}
|
|
uint32_t dirty_bind = dirty_image_binds_;
|
|
dirty_image_binds_ = 0;
|
|
|
|
int first = bitscan_forward_uint(dirty_bind);
|
|
int last = 32 - bitscan_reverse_uint(dirty_bind);
|
|
int count = last - first;
|
|
|
|
if (GLContext::multi_bind_support) {
|
|
glBindImageTextures(first, count, images_ + first);
|
|
}
|
|
else {
|
|
for (int unit = first; unit < last; unit++) {
|
|
if ((dirty_bind >> unit) & 1UL) {
|
|
glBindImageTexture(unit, images_[unit], 0, GL_TRUE, 0, GL_READ_WRITE, formats_[unit]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint8_t GLStateManager::bound_image_slots()
|
|
{
|
|
uint8_t bound_slots = 0;
|
|
for (int i = 0; i < ARRAY_SIZE(images_); i++) {
|
|
if (images_[i] != 0) {
|
|
bound_slots |= 1ULL << i;
|
|
}
|
|
}
|
|
return bound_slots;
|
|
}
|
|
|
|
/** \} */
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/** \name Memory barrier
|
|
* \{ */
|
|
|
|
void GLStateManager::issue_barrier(eGPUBarrier barrier_bits)
|
|
{
|
|
glMemoryBarrier(to_gl(barrier_bits));
|
|
}
|
|
|
|
/** \} */
|
|
|
|
} // namespace blender::gpu
|