// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <iterator>
#include <glad/glad.h>
#include "common/assert.h"
#include "common/logging/log.h"
#include "common/microprofile.h"
#include "video_core/renderer_opengl/gl_state.h"
MICROPROFILE_DEFINE(OpenGL_State, "OpenGL", "State Change", MP_RGB(192, 128, 128));
namespace OpenGL {
using Maxwell = Tegra::Engines::Maxwell3D::Regs;
OpenGLState OpenGLState::cur_state;
namespace {
template <typename T>
bool UpdateValue(T& current_value, const T new_value) {
const bool changed = current_value != new_value;
current_value = new_value;
return changed;
}
template <typename T1, typename T2>
bool UpdateTie(T1 current_value, const T2 new_value) {
const bool changed = current_value != new_value;
current_value = new_value;
return changed;
}
template <typename T>
std::optional<std::pair<GLuint, GLsizei>> UpdateArray(T& current_values, const T& new_values) {
std::optional<std::size_t> first;
std::size_t last;
for (std::size_t i = 0; i < std::size(current_values); ++i) {
if (!UpdateValue(current_values[i], new_values[i])) {
continue;
}
if (!first) {
first = i;
}
last = i;
}
if (!first) {
return std::nullopt;
}
return std::make_pair(static_cast<GLuint>(*first), static_cast<GLsizei>(last - *first + 1));
}
void Enable(GLenum cap, bool enable) {
if (enable) {
glEnable(cap);
} else {
glDisable(cap);
}
}
void Enable(GLenum cap, GLuint index, bool enable) {
if (enable) {
glEnablei(cap, index);
} else {
glDisablei(cap, index);
}
}
void Enable(GLenum cap, bool& current_value, bool new_value) {
if (UpdateValue(current_value, new_value)) {
Enable(cap, new_value);
}
}
void Enable(GLenum cap, GLuint index, bool& current_value, bool new_value) {
if (UpdateValue(current_value, new_value)) {
Enable(cap, index, new_value);
}
}
} // Anonymous namespace
OpenGLState::OpenGLState() = default;
void OpenGLState::SetDefaultViewports() {
viewports.fill(Viewport{});
depth_clamp.far_plane = false;
depth_clamp.near_plane = false;
}
void OpenGLState::ApplyFramebufferState() {
if (UpdateValue(cur_state.draw.read_framebuffer, draw.read_framebuffer)) {
glBindFramebuffer(GL_READ_FRAMEBUFFER, draw.read_framebuffer);
}
if (UpdateValue(cur_state.draw.draw_framebuffer, draw.draw_framebuffer)) {
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, draw.draw_framebuffer);
}
}
void OpenGLState::ApplyVertexArrayState() {
if (UpdateValue(cur_state.draw.vertex_array, draw.vertex_array)) {
glBindVertexArray(draw.vertex_array);
}
}
void OpenGLState::ApplyShaderProgram() {
if (UpdateValue(cur_state.draw.shader_program, draw.shader_program)) {
glUseProgram(draw.shader_program);
}
}
void OpenGLState::ApplyProgramPipeline() {
if (UpdateValue(cur_state.draw.program_pipeline, draw.program_pipeline)) {
glBindProgramPipeline(draw.program_pipeline);
}
}
void OpenGLState::ApplyClipDistances() {
for (std::size_t i = 0; i < clip_distance.size(); ++i) {
Enable(GL_CLIP_DISTANCE0 + static_cast<GLenum>(i), cur_state.clip_distance[i],
clip_distance[i]);
}
}
void OpenGLState::ApplyFragmentColorClamp() {
if (UpdateValue(cur_state.fragment_color_clamp.enabled, fragment_color_clamp.enabled)) {
glClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
fragment_color_clamp.enabled ? GL_TRUE : GL_FALSE);
}
}
void OpenGLState::ApplyMultisample() {
Enable(GL_SAMPLE_ALPHA_TO_COVERAGE, cur_state.multisample_control.alpha_to_coverage,
multisample_control.alpha_to_coverage);
Enable(GL_SAMPLE_ALPHA_TO_ONE, cur_state.multisample_control.alpha_to_one,
multisample_control.alpha_to_one);
}
void OpenGLState::ApplyDepthClamp() {
if (depth_clamp.far_plane == cur_state.depth_clamp.far_plane &&
depth_clamp.near_plane == cur_state.depth_clamp.near_plane) {
return;
}
cur_state.depth_clamp = depth_clamp;
UNIMPLEMENTED_IF_MSG(depth_clamp.far_plane != depth_clamp.near_plane,
"Unimplemented Depth Clamp Separation!");
Enable(GL_DEPTH_CLAMP, depth_clamp.far_plane || depth_clamp.near_plane);
}
void OpenGLState::ApplySRgb() {
if (cur_state.framebuffer_srgb.enabled == framebuffer_srgb.enabled)
return;
cur_state.framebuffer_srgb.enabled = framebuffer_srgb.enabled;
if (framebuffer_srgb.enabled) {
glEnable(GL_FRAMEBUFFER_SRGB);
} else {
glDisable(GL_FRAMEBUFFER_SRGB);
}
}
void OpenGLState::ApplyCulling() {
Enable(GL_CULL_FACE, cur_state.cull.enabled, cull.enabled);
if (UpdateValue(cur_state.cull.mode, cull.mode)) {
glCullFace(cull.mode);
}
}
void OpenGLState::ApplyRasterizerDiscard() {
Enable(GL_RASTERIZER_DISCARD, cur_state.rasterizer_discard, rasterizer_discard);
}
void OpenGLState::ApplyColorMask() {
for (std::size_t i = 0; i < Maxwell::NumRenderTargets; ++i) {
const auto& updated = color_mask[i];
auto& current = cur_state.color_mask[i];
if (updated.red_enabled != current.red_enabled ||
updated.green_enabled != current.green_enabled ||
updated.blue_enabled != current.blue_enabled ||
updated.alpha_enabled != current.alpha_enabled) {
current = updated;
glColorMaski(static_cast<GLuint>(i), updated.red_enabled, updated.green_enabled,
updated.blue_enabled, updated.alpha_enabled);
}
}
}
void OpenGLState::ApplyDepth() {
Enable(GL_DEPTH_TEST, cur_state.depth.test_enabled, depth.test_enabled);
if (cur_state.depth.test_func != depth.test_func) {
cur_state.depth.test_func = depth.test_func;
glDepthFunc(depth.test_func);
}
if (cur_state.depth.write_mask != depth.write_mask) {
cur_state.depth.write_mask = depth.write_mask;
glDepthMask(depth.write_mask);
}
}
void OpenGLState::ApplyPrimitiveRestart() {
Enable(GL_PRIMITIVE_RESTART, cur_state.primitive_restart.enabled, primitive_restart.enabled);
if (cur_state.primitive_restart.index != primitive_restart.index) {
cur_state.primitive_restart.index = primitive_restart.index;
glPrimitiveRestartIndex(primitive_restart.index);
}
}
void OpenGLState::ApplyStencilTest() {
Enable(GL_STENCIL_TEST, cur_state.stencil.test_enabled, stencil.test_enabled);
const auto ConfigStencil = [](GLenum face, const auto& config, auto& current) {
if (current.test_func != config.test_func || current.test_ref != config.test_ref ||
current.test_mask != config.test_mask) {
current.test_func = config.test_func;
current.test_ref = config.test_ref;
current.test_mask = config.test_mask;
glStencilFuncSeparate(face, config.test_func, config.test_ref, config.test_mask);
}
if (current.action_depth_fail != config.action_depth_fail ||
current.action_depth_pass != config.action_depth_pass ||
current.action_stencil_fail != config.action_stencil_fail) {
current.action_depth_fail = config.action_depth_fail;
current.action_depth_pass = config.action_depth_pass;
current.action_stencil_fail = config.action_stencil_fail;
glStencilOpSeparate(face, config.action_stencil_fail, config.action_depth_fail,
config.action_depth_pass);
}
if (current.write_mask != config.write_mask) {
current.write_mask = config.write_mask;
glStencilMaskSeparate(face, config.write_mask);
}
};
ConfigStencil(GL_FRONT, stencil.front, cur_state.stencil.front);
ConfigStencil(GL_BACK, stencil.back, cur_state.stencil.back);
}
void OpenGLState::ApplyViewport() {
for (GLuint i = 0; i < static_cast<GLuint>(Maxwell::NumViewports); ++i) {
const auto& updated = viewports[i];
auto& current = cur_state.viewports[i];
if (current.x != updated.x || current.y != updated.y || current.width != updated.width ||
current.height != updated.height) {
current.x = updated.x;
current.y = updated.y;
current.width = updated.width;
current.height = updated.height;
glViewportIndexedf(i, static_cast<GLfloat>(updated.x), static_cast<GLfloat>(updated.y),
static_cast<GLfloat>(updated.width),
static_cast<GLfloat>(updated.height));
}
if (current.depth_range_near != updated.depth_range_near ||
current.depth_range_far != updated.depth_range_far) {
current.depth_range_near = updated.depth_range_near;
current.depth_range_far = updated.depth_range_far;
glDepthRangeIndexed(i, updated.depth_range_near, updated.depth_range_far);
}
Enable(GL_SCISSOR_TEST, i, current.scissor.enabled, updated.scissor.enabled);
if (current.scissor.x != updated.scissor.x || current.scissor.y != updated.scissor.y ||
current.scissor.width != updated.scissor.width ||
current.scissor.height != updated.scissor.height) {
current.scissor.x = updated.scissor.x;
current.scissor.y = updated.scissor.y;
current.scissor.width = updated.scissor.width;
current.scissor.height = updated.scissor.height;
glScissorIndexed(i, updated.scissor.x, updated.scissor.y, updated.scissor.width,
updated.scissor.height);
}
}
}
void OpenGLState::ApplyGlobalBlending() {
const Blend& updated = blend[0];
Blend& current = cur_state.blend[0];
Enable(GL_BLEND, current.enabled, updated.enabled);
if (current.src_rgb_func != updated.src_rgb_func ||
current.dst_rgb_func != updated.dst_rgb_func || current.src_a_func != updated.src_a_func ||
current.dst_a_func != updated.dst_a_func) {
current.src_rgb_func = updated.src_rgb_func;
current.dst_rgb_func = updated.dst_rgb_func;
current.src_a_func = updated.src_a_func;
current.dst_a_func = updated.dst_a_func;
glBlendFuncSeparate(updated.src_rgb_func, updated.dst_rgb_func, updated.src_a_func,
updated.dst_a_func);
}
if (current.rgb_equation != updated.rgb_equation || current.a_equation != updated.a_equation) {
current.rgb_equation = updated.rgb_equation;
current.a_equation = updated.a_equation;
glBlendEquationSeparate(updated.rgb_equation, updated.a_equation);
}
}
void OpenGLState::ApplyTargetBlending(std::size_t target, bool force) {
const Blend& updated = blend[target];
Blend& current = cur_state.blend[target];
if (current.enabled != updated.enabled || force) {
current.enabled = updated.enabled;
Enable(GL_BLEND, static_cast<GLuint>(target), updated.enabled);
}
if (UpdateTie(std::tie(current.src_rgb_func, current.dst_rgb_func, current.src_a_func,
current.dst_a_func),
std::tie(updated.src_rgb_func, updated.dst_rgb_func, updated.src_a_func,
updated.dst_a_func))) {
glBlendFuncSeparatei(static_cast<GLuint>(target), updated.src_rgb_func,
updated.dst_rgb_func, updated.src_a_func, updated.dst_a_func);
}
if (UpdateTie(std::tie(current.rgb_equation, current.a_equation),
std::tie(updated.rgb_equation, updated.a_equation))) {
glBlendEquationSeparatei(static_cast<GLuint>(target), updated.rgb_equation,
updated.a_equation);
}
}
void OpenGLState::ApplyBlending() {
if (independant_blend.enabled) {
const bool force = independant_blend.enabled != cur_state.independant_blend.enabled;
for (std::size_t target = 0; target < Maxwell::NumRenderTargets; ++target) {
ApplyTargetBlending(target, force);
}
} else {
ApplyGlobalBlending();
}
cur_state.independant_blend.enabled = independant_blend.enabled;
if (UpdateTie(
std::tie(cur_state.blend_color.red, cur_state.blend_color.green,
cur_state.blend_color.blue, cur_state.blend_color.alpha),
std::tie(blend_color.red, blend_color.green, blend_color.blue, blend_color.alpha))) {
glBlendColor(blend_color.red, blend_color.green, blend_color.blue, blend_color.alpha);
}
}
void OpenGLState::ApplyLogicOp() {
Enable(GL_COLOR_LOGIC_OP, cur_state.logic_op.enabled, logic_op.enabled);
if (UpdateValue(cur_state.logic_op.operation, logic_op.operation)) {
glLogicOp(logic_op.operation);
}
}
void OpenGLState::ApplyPolygonOffset() {
Enable(GL_POLYGON_OFFSET_FILL, cur_state.polygon_offset.fill_enable,
polygon_offset.fill_enable);
Enable(GL_POLYGON_OFFSET_LINE, cur_state.polygon_offset.line_enable,
polygon_offset.line_enable);
Enable(GL_POLYGON_OFFSET_POINT, cur_state.polygon_offset.point_enable,
polygon_offset.point_enable);
if (UpdateTie(std::tie(cur_state.polygon_offset.factor, cur_state.polygon_offset.units,
cur_state.polygon_offset.clamp),
std::tie(polygon_offset.factor, polygon_offset.units, polygon_offset.clamp))) {
if (GLAD_GL_EXT_polygon_offset_clamp && polygon_offset.clamp != 0) {
glPolygonOffsetClamp(polygon_offset.factor, polygon_offset.units, polygon_offset.clamp);
} else {
UNIMPLEMENTED_IF_MSG(polygon_offset.clamp != 0,
"Unimplemented Depth polygon offset clamp.");
glPolygonOffset(polygon_offset.factor, polygon_offset.units);
}
}
}
void OpenGLState::ApplyAlphaTest() {
Enable(GL_ALPHA_TEST, cur_state.alpha_test.enabled, alpha_test.enabled);
if (UpdateTie(std::tie(cur_state.alpha_test.func, cur_state.alpha_test.ref),
std::tie(alpha_test.func, alpha_test.ref))) {
glAlphaFunc(alpha_test.func, alpha_test.ref);
}
}
void OpenGLState::ApplyClipControl() {
if (UpdateTie(std::tie(cur_state.clip_control.origin, cur_state.clip_control.depth_mode),
std::tie(clip_control.origin, clip_control.depth_mode))) {
glClipControl(clip_control.origin, clip_control.depth_mode);
}
}
void OpenGLState::ApplyRenderBuffer() {
if (cur_state.renderbuffer != renderbuffer) {
cur_state.renderbuffer = renderbuffer;
glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
}
}
void OpenGLState::ApplyTextures() {
const std::size_t size = std::size(textures);
for (std::size_t i = 0; i < size; ++i) {
if (UpdateValue(cur_state.textures[i], textures[i])) {
// BindTextureUnit doesn't support binding null textures, skip those binds.
// TODO(Rodrigo): Stop using null textures
if (textures[i] != 0) {
glBindTextureUnit(static_cast<GLuint>(i), textures[i]);
}
}
}
}
void OpenGLState::ApplySamplers() {
const std::size_t size = std::size(samplers);
for (std::size_t i = 0; i < size; ++i) {
if (UpdateValue(cur_state.samplers[i], samplers[i])) {
glBindSampler(static_cast<GLuint>(i), samplers[i]);
}
}
}
void OpenGLState::ApplyImages() {
if (const auto update = UpdateArray(cur_state.images, images)) {
glBindImageTextures(update->first, update->second, images.data() + update->first);
}
}
void OpenGLState::Apply() {
MICROPROFILE_SCOPE(OpenGL_State);
ApplyFramebufferState();
ApplyVertexArrayState();
ApplyShaderProgram();
ApplyProgramPipeline();
ApplyClipDistances();
ApplyFragmentColorClamp();
ApplyMultisample();
ApplyRasterizerDiscard();
ApplyColorMask();
ApplyDepthClamp();
ApplyViewport();
ApplyStencilTest();
ApplySRgb();
ApplyCulling();
ApplyDepth();
ApplyPrimitiveRestart();
ApplyBlending();
ApplyLogicOp();
ApplyTextures();
ApplySamplers();
ApplyImages();
ApplyPolygonOffset();
ApplyAlphaTest();
ApplyClipControl();
ApplyRenderBuffer();
}
void OpenGLState::EmulateViewportWithScissor() {
auto& current = viewports[0];
if (current.scissor.enabled) {
const GLint left = std::max(current.x, current.scissor.x);
const GLint right =
std::max(current.x + current.width, current.scissor.x + current.scissor.width);
const GLint bottom = std::max(current.y, current.scissor.y);
const GLint top =
std::max(current.y + current.height, current.scissor.y + current.scissor.height);
current.scissor.x = std::max(left, 0);
current.scissor.y = std::max(bottom, 0);
current.scissor.width = std::max(right - left, 0);
current.scissor.height = std::max(top - bottom, 0);
} else {
current.scissor.enabled = true;
current.scissor.x = current.x;
current.scissor.y = current.y;
current.scissor.width = current.width;
current.scissor.height = current.height;
}
}
OpenGLState& OpenGLState::UnbindTexture(GLuint handle) {
for (auto& texture : textures) {
if (texture == handle) {
texture = 0;
}
}
return *this;
}
OpenGLState& OpenGLState::ResetSampler(GLuint handle) {
for (auto& sampler : samplers) {
if (sampler == handle) {
sampler = 0;
}
}
return *this;
}
OpenGLState& OpenGLState::ResetProgram(GLuint handle) {
if (draw.shader_program == handle) {
draw.shader_program = 0;
}
return *this;
}
OpenGLState& OpenGLState::ResetPipeline(GLuint handle) {
if (draw.program_pipeline == handle) {
draw.program_pipeline = 0;
}
return *this;
}
OpenGLState& OpenGLState::ResetVertexArray(GLuint handle) {
if (draw.vertex_array == handle) {
draw.vertex_array = 0;
}
return *this;
}
OpenGLState& OpenGLState::ResetFramebuffer(GLuint handle) {
if (draw.read_framebuffer == handle) {
draw.read_framebuffer = 0;
}
if (draw.draw_framebuffer == handle) {
draw.draw_framebuffer = 0;
}
return *this;
}
OpenGLState& OpenGLState::ResetRenderbuffer(GLuint handle) {
if (renderbuffer == handle) {
renderbuffer = 0;
}
return *this;
}
} // namespace OpenGL