From f019817f8f6452dec784d8217ef102231319d26c Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Wed, 30 Oct 2019 00:23:09 -0300 Subject: [PATCH] gl_rasterizer: Emulate viewport flipping with ARB_clip_control Emulates negative y viewports with ARB_clip_control. This allows us to more easily emulated pipelines with tessellation and/or geometry shader stages. It also avoids corrupting games with transform feedbacks and negative viewports (gl_Position.y was being modified). --- .../renderer_opengl/gl_rasterizer.cpp | 48 +++++++++++-------- .../renderer_opengl/gl_shader_decompiler.cpp | 8 +--- .../renderer_opengl/gl_shader_gen.cpp | 24 ++-------- .../renderer_opengl/gl_shader_manager.cpp | 19 +------- .../renderer_opengl/gl_shader_manager.h | 13 ++--- src/video_core/renderer_opengl/gl_state.cpp | 7 +++ src/video_core/renderer_opengl/gl_state.h | 5 ++ src/yuzu/main.cpp | 3 ++ .../emu_window/emu_window_sdl2_gl.cpp | 2 + 9 files changed, 55 insertions(+), 74 deletions(-) diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp index e560d70d55..53ee754ff9 100644 --- a/src/video_core/renderer_opengl/gl_rasterizer.cpp +++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp @@ -257,10 +257,8 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) { continue; } - const std::size_t stage{index == 0 ? 0 : index - 1}; // Stage indices are 0 - 5 - GLShader::MaxwellUniformData ubo{}; - ubo.SetFromRegs(gpu, stage); + ubo.SetFromRegs(gpu); const auto [buffer, offset] = buffer_cache.UploadHostMemory(&ubo, sizeof(ubo), device.GetUniformBufferAlignment()); @@ -269,10 +267,11 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) { Shader shader{shader_cache.GetStageProgram(program)}; - const auto stage_enum = static_cast(stage); - SetupDrawConstBuffers(stage_enum, shader); - SetupDrawGlobalMemory(stage_enum, shader); - const auto texture_buffer_usage{SetupDrawTextures(stage_enum, shader, base_bindings)}; + // Stage indices are 0 - 5 + const auto stage = static_cast(index == 0 ? 0 : index - 1); + SetupDrawConstBuffers(stage, shader); + SetupDrawGlobalMemory(stage, shader); + const auto texture_buffer_usage{SetupDrawTextures(stage, shader, base_bindings)}; const ProgramVariant variant{base_bindings, primitive_mode, texture_buffer_usage}; const auto [program_handle, next_bindings] = shader->GetProgramHandle(variant); @@ -1055,6 +1054,15 @@ void RasterizerOpenGL::SyncViewport(OpenGLState& current_state) { } state.depth_clamp.far_plane = regs.view_volume_clip_control.depth_clamp_far != 0; state.depth_clamp.near_plane = regs.view_volume_clip_control.depth_clamp_near != 0; + + bool flip_y = false; + if (regs.viewport_transform[0].scale_y < 0.0) { + flip_y = !flip_y; + } + if (regs.screen_y_control.y_negate != 0) { + flip_y = !flip_y; + } + state.clip_control.origin = flip_y ? GL_UPPER_LEFT : GL_LOWER_LEFT; } void RasterizerOpenGL::SyncClipEnabled( @@ -1077,26 +1085,24 @@ void RasterizerOpenGL::SyncClipCoef() { } void RasterizerOpenGL::SyncCullMode() { - auto& maxwell3d = system.GPU().Maxwell3D(); - - const auto& regs = maxwell3d.regs; + const auto& regs = system.GPU().Maxwell3D().regs; state.cull.enabled = regs.cull.enabled != 0; if (state.cull.enabled) { - state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face); state.cull.mode = MaxwellToGL::CullFace(regs.cull.cull_face); + } - const bool flip_triangles{regs.screen_y_control.triangle_rast_flip == 0 || - regs.viewport_transform[0].scale_y < 0.0f}; + state.cull.front_face = MaxwellToGL::FrontFace(regs.cull.front_face); - // If the GPU is configured to flip the rasterized triangles, then we need to flip the - // notion of front and back. Note: We flip the triangles when the value of the register is 0 - // because OpenGL already does it for us. - if (flip_triangles) { - if (state.cull.front_face == GL_CCW) - state.cull.front_face = GL_CW; - else if (state.cull.front_face == GL_CW) - state.cull.front_face = GL_CCW; + // If the GPU is configured to flip the rasterized triangles, then we need to flip the + // notion of front and back. + const bool flip_triangles{regs.screen_y_control.triangle_rast_flip != 0 && + regs.viewport_transform[0].scale_y > 0.0f}; + if (flip_triangles) { + if (state.cull.front_face == GL_CCW) { + state.cull.front_face = GL_CW; + } else if (state.cull.front_face == GL_CW) { + state.cull.front_face = GL_CCW; } } } diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp index 92ee8459e4..8dcbeefc09 100644 --- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp +++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp @@ -1872,10 +1872,6 @@ private: Expression EmitVertex(Operation operation) { ASSERT_MSG(stage == ProgramType::Geometry, "EmitVertex is expected to be used in a geometry shader."); - - // If a geometry shader is attached, it will always flip (it's the last stage before - // fragment). For more info about flipping, refer to gl_shader_gen.cpp. - code.AddLine("gl_Position.xy *= viewport_flip.xy;"); code.AddLine("EmitVertex();"); return {}; } @@ -1883,14 +1879,12 @@ private: Expression EndPrimitive(Operation operation) { ASSERT_MSG(stage == ProgramType::Geometry, "EndPrimitive is expected to be used in a geometry shader."); - code.AddLine("EndPrimitive();"); return {}; } Expression YNegate(Operation operation) { - // Config pack's third value is Y_NEGATE's state. - return {"config_pack[2]", Type::Uint}; + return {"y_negate", Type::Float}; } template diff --git a/src/video_core/renderer_opengl/gl_shader_gen.cpp b/src/video_core/renderer_opengl/gl_shader_gen.cpp index 0e22eede90..af17216bdb 100644 --- a/src/video_core/renderer_opengl/gl_shader_gen.cpp +++ b/src/video_core/renderer_opengl/gl_shader_gen.cpp @@ -20,8 +20,7 @@ std::string GenerateVertexShader(const Device& device, const ShaderIR& ir, const std::string out = GetCommonDeclarations(); out += R"( layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config { - vec4 viewport_flip; - uvec4 config_pack; // instance_id, flip_stage, y_direction, padding + float y_direction; }; )"; @@ -35,23 +34,10 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config { void main() { execute_vertex(); )"; - if (ir_b) { out += " execute_vertex_b();"; } - - out += R"( - - // Set Position Y direction - gl_Position.y *= utof(config_pack[2]); - // Check if the flip stage is VertexB - // Config pack's second value is flip_stage - if (config_pack[1] == 1) { - // Viewport can be flipped, which is unsupported by glViewport - gl_Position.xy *= viewport_flip.xy; - } -} -)"; + out += "}\n"; return out; } @@ -59,8 +45,7 @@ std::string GenerateGeometryShader(const Device& device, const ShaderIR& ir) { std::string out = GetCommonDeclarations(); out += R"( layout (std140, binding = EMULATION_UBO_BINDING) uniform gs_config { - vec4 viewport_flip; - uvec4 config_pack; // instance_id, flip_stage, y_direction, padding + float y_direction; }; )"; @@ -87,8 +72,7 @@ layout (location = 6) out vec4 FragColor6; layout (location = 7) out vec4 FragColor7; layout (std140, binding = EMULATION_UBO_BINDING) uniform fs_config { - vec4 viewport_flip; - uvec4 config_pack; // instance_id, flip_stage, y_direction, padding + float y_direction; }; )"; diff --git a/src/video_core/renderer_opengl/gl_shader_manager.cpp b/src/video_core/renderer_opengl/gl_shader_manager.cpp index b05f90f20d..cd729d9786 100644 --- a/src/video_core/renderer_opengl/gl_shader_manager.cpp +++ b/src/video_core/renderer_opengl/gl_shader_manager.cpp @@ -40,27 +40,12 @@ void ProgramManager::UpdatePipeline() { old_state = current_state; } -void MaxwellUniformData::SetFromRegs(const Maxwell3D& maxwell, std::size_t shader_stage) { +void MaxwellUniformData::SetFromRegs(const Maxwell3D& maxwell) { const auto& regs = maxwell.regs; const auto& state = maxwell.state; - // TODO(bunnei): Support more than one viewport - viewport_flip[0] = regs.viewport_transform[0].scale_x < 0.0 ? -1.0f : 1.0f; - viewport_flip[1] = regs.viewport_transform[0].scale_y < 0.0 ? -1.0f : 1.0f; - - instance_id = state.current_instance; - - // Assign in which stage the position has to be flipped - // (the last stage before the fragment shader). - constexpr u32 geometry_index = static_cast(Maxwell3D::Regs::ShaderProgram::Geometry); - if (maxwell.regs.shader_config[geometry_index].enable) { - flip_stage = geometry_index; - } else { - flip_stage = static_cast(Maxwell3D::Regs::ShaderProgram::VertexB); - } - // Y_NEGATE controls what value S2R returns for the Y_DIRECTION system value. - y_direction = regs.screen_y_control.y_negate == 0 ? 1.f : -1.f; + y_direction = regs.screen_y_control.y_negate == 0 ? 1.0f : -1.0f; } } // namespace OpenGL::GLShader diff --git a/src/video_core/renderer_opengl/gl_shader_manager.h b/src/video_core/renderer_opengl/gl_shader_manager.h index 6961e702a2..3703e7018d 100644 --- a/src/video_core/renderer_opengl/gl_shader_manager.h +++ b/src/video_core/renderer_opengl/gl_shader_manager.h @@ -18,17 +18,12 @@ namespace OpenGL::GLShader { /// @note Always keep a vec4 at the end. The GL spec is not clear whether the alignment at /// the end of a uniform block is included in UNIFORM_BLOCK_DATA_SIZE or not. /// Not following that rule will cause problems on some AMD drivers. -struct MaxwellUniformData { - void SetFromRegs(const Tegra::Engines::Maxwell3D& maxwell, std::size_t shader_stage); +struct alignas(16) MaxwellUniformData { + void SetFromRegs(const Tegra::Engines::Maxwell3D& maxwell); - alignas(16) GLvec4 viewport_flip; - struct alignas(16) { - GLuint instance_id; - GLuint flip_stage; - GLfloat y_direction; - }; + GLfloat y_direction; }; -static_assert(sizeof(MaxwellUniformData) == 32, "MaxwellUniformData structure size is incorrect"); +static_assert(sizeof(MaxwellUniformData) == 16, "MaxwellUniformData structure size is incorrect"); static_assert(sizeof(MaxwellUniformData) < 16384, "MaxwellUniformData structure must be less than 16kb as per the OpenGL spec"); diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp index f25148362f..ccbe5912ea 100644 --- a/src/video_core/renderer_opengl/gl_state.cpp +++ b/src/video_core/renderer_opengl/gl_state.cpp @@ -410,6 +410,12 @@ void OpenGLState::ApplyAlphaTest() { } } +void OpenGLState::ApplyClipControl() { + if (UpdateValue(cur_state.clip_control.origin, clip_control.origin)) { + glClipControl(clip_control.origin, GL_NEGATIVE_ONE_TO_ONE); + } +} + void OpenGLState::ApplyTextures() { if (const auto update = UpdateArray(cur_state.textures, textures)) { glBindTextures(update->first, update->second, textures.data() + update->first); @@ -453,6 +459,7 @@ void OpenGLState::Apply() { ApplyImages(); ApplyPolygonOffset(); ApplyAlphaTest(); + ApplyClipControl(); } void OpenGLState::EmulateViewportWithScissor() { diff --git a/src/video_core/renderer_opengl/gl_state.h b/src/video_core/renderer_opengl/gl_state.h index cca25206b2..eaff22bda0 100644 --- a/src/video_core/renderer_opengl/gl_state.h +++ b/src/video_core/renderer_opengl/gl_state.h @@ -146,6 +146,10 @@ public: std::array clip_distance = {}; // GL_CLIP_DISTANCE + struct { + GLenum origin = GL_LOWER_LEFT; + } clip_control; + OpenGLState(); /// Get the currently active OpenGL state @@ -182,6 +186,7 @@ public: void ApplyDepthClamp(); void ApplyPolygonOffset(); void ApplyAlphaTest(); + void ApplyClipControl(); /// Resets any references to the given resource OpenGLState& UnbindTexture(GLuint handle); diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp index 160613ee15..867f8e9130 100644 --- a/src/yuzu/main.cpp +++ b/src/yuzu/main.cpp @@ -817,6 +817,9 @@ QStringList GMainWindow::GetUnsupportedGLExtensions() { if (!GLAD_GL_ARB_multi_bind) { unsupported_ext.append(QStringLiteral("ARB_multi_bind")); } + if (!GLAD_GL_ARB_clip_control) { + unsupported_ext.append(QStringLiteral("ARB_clip_control")); + } // Extensions required to support some texture formats. if (!GLAD_GL_EXT_texture_compression_s3tc) { diff --git a/src/yuzu_cmd/emu_window/emu_window_sdl2_gl.cpp b/src/yuzu_cmd/emu_window/emu_window_sdl2_gl.cpp index f91b071bf5..075a7074f1 100644 --- a/src/yuzu_cmd/emu_window/emu_window_sdl2_gl.cpp +++ b/src/yuzu_cmd/emu_window/emu_window_sdl2_gl.cpp @@ -62,6 +62,8 @@ bool EmuWindow_SDL2_GL::SupportsRequiredGLExtensions() { unsupported_ext.push_back("ARB_texture_mirror_clamp_to_edge"); if (!GLAD_GL_ARB_multi_bind) unsupported_ext.push_back("ARB_multi_bind"); + if (!GLAD_GL_ARB_clip_control) + unsupported_ext.push_back("ARB_clip_control"); // Extensions required to support some texture formats. if (!GLAD_GL_EXT_texture_compression_s3tc)