diff options
Diffstat (limited to 'source/blender/gpu/opengl/gl_shader.cc')
| -rw-r--r-- | source/blender/gpu/opengl/gl_shader.cc | 175 |
1 files changed, 166 insertions, 9 deletions
diff --git a/source/blender/gpu/opengl/gl_shader.cc b/source/blender/gpu/opengl/gl_shader.cc index e031047f844..3ab3b11d1f4 100644 --- a/source/blender/gpu/opengl/gl_shader.cc +++ b/source/blender/gpu/opengl/gl_shader.cc @@ -277,15 +277,15 @@ static void print_image_type(std::ostream &os, static std::ostream &print_qualifier(std::ostream &os, const Qualifier &qualifiers) { - if ((qualifiers & Qualifier::RESTRICT) == Qualifier::RESTRICT) { + if (bool(qualifiers & Qualifier::NO_RESTRICT) == false) { os << "restrict "; } - if ((qualifiers & Qualifier::READ_ONLY) == Qualifier::READ_ONLY) { - os << "readonly "; - } - if ((qualifiers & Qualifier::WRITE_ONLY) == Qualifier::WRITE_ONLY) { + if (bool(qualifiers & Qualifier::READ) == false) { os << "writeonly "; } + if (bool(qualifiers & Qualifier::WRITE) == false) { + os << "readonly "; + } return os; } @@ -370,7 +370,7 @@ static void print_interface(std::ostream &os, const StageInterfaceInfo &iface, const StringRefNull &suffix = "") { - /* TODO(fclem) Move that to interface check. */ + /* TODO(@fclem): Move that to interface check. */ // if (iface.instance_name.is_empty()) { // BLI_assert_msg(0, "Interfaces require an instance name for geometry shader."); // std::cout << iface.name << ": Interfaces require an instance name for geometry shader.\n"; @@ -426,9 +426,28 @@ std::string GLShader::resources_declare(const ShaderCreateInfo &info) const return ss.str(); } +static std::string main_function_wrapper(std::string &pre_main, std::string &post_main) +{ + std::stringstream ss; + /* Prototype for the original main. */ + ss << "\n"; + ss << "void main_function_();\n"; + /* Wrapper to the main function in order to inject code processing on globals. */ + ss << "void main() {\n"; + ss << pre_main; + ss << " main_function_();\n"; + ss << post_main; + ss << "}\n"; + /* Rename the original main. */ + ss << "#define main main_function_\n"; + ss << "\n"; + return ss.str(); +} + std::string GLShader::vertex_interface_declare(const ShaderCreateInfo &info) const { std::stringstream ss; + std::string post_main = ""; ss << "\n/* Inputs. */\n"; for (const ShaderCreateInfo::VertIn &attr : info.vertex_inputs_) { @@ -441,13 +460,35 @@ std::string GLShader::vertex_interface_declare(const ShaderCreateInfo &info) con for (const StageInterfaceInfo *iface : info.vertex_out_interfaces_) { print_interface(ss, "out", *iface); } + if (!GLContext::layered_rendering_support && bool(info.builtins_ & BuiltinBits::LAYER)) { + ss << "out int gpu_Layer;\n"; + } + if (bool(info.builtins_ & BuiltinBits::BARYCENTRIC_COORD)) { + if (!GLContext::native_barycentric_support) { + /* Disabled or unsupported. */ + } + else if (GLEW_AMD_shader_explicit_vertex_parameter) { + /* Need this for stable barycentric. */ + ss << "flat out vec4 gpu_pos_flat;\n"; + ss << "out vec4 gpu_pos;\n"; + + post_main += " gpu_pos = gpu_pos_flat = gl_Position;\n"; + } + } ss << "\n"; + + if (post_main.empty() == false) { + std::string pre_main = ""; + ss << main_function_wrapper(pre_main, post_main); + } return ss.str(); } std::string GLShader::fragment_interface_declare(const ShaderCreateInfo &info) const { std::stringstream ss; + std::string pre_main = ""; + ss << "\n/* Interfaces. */\n"; const Vector<StageInterfaceInfo *> &in_interfaces = (info.geometry_source_.is_empty()) ? info.vertex_out_interfaces_ : @@ -455,6 +496,32 @@ std::string GLShader::fragment_interface_declare(const ShaderCreateInfo &info) c for (const StageInterfaceInfo *iface : in_interfaces) { print_interface(ss, "in", *iface); } + if (bool(info.builtins_ & BuiltinBits::BARYCENTRIC_COORD)) { + if (!GLContext::native_barycentric_support) { + ss << "smooth in vec3 gpu_BaryCoord;\n"; + ss << "noperspective in vec3 gpu_BaryCoordNoPersp;\n"; + } + else if (GLEW_AMD_shader_explicit_vertex_parameter) { + /* NOTE(fclem): This won't work with geometry shader. Hopefully, we don't need geometry + * shader workaround if this extension/feature is detected. */ + ss << "\n/* Stable Barycentric Coordinates. */\n"; + ss << "flat in vec4 gpu_pos_flat;\n"; + ss << "__explicitInterpAMD in vec4 gpu_pos;\n"; + /* Globals. */ + ss << "vec3 gpu_BaryCoord;\n"; + ss << "vec3 gpu_BaryCoordNoPersp;\n"; + ss << "\n"; + ss << "vec2 stable_bary_(vec2 in_bary) {\n"; + ss << " vec3 bary = vec3(in_bary, 1.0 - in_bary.x - in_bary.y);\n"; + ss << " if (interpolateAtVertexAMD(gpu_pos, 0) == gpu_pos_flat) { return bary.zxy; }\n"; + ss << " if (interpolateAtVertexAMD(gpu_pos, 2) == gpu_pos_flat) { return bary.yzx; }\n"; + ss << " return bary.xyz;\n"; + ss << "}\n"; + + pre_main += " gpu_BaryCoord = stable_bary_(gl_BaryCoordSmoothAMD);\n"; + pre_main += " gpu_BaryCoordNoPersp = stable_bary_(gl_BaryCoordNoPerspAMD);\n"; + } + } ss << "\n/* Outputs. */\n"; for (const ShaderCreateInfo::FragOut &output : info.fragment_outputs_) { ss << "layout(location = " << output.index; @@ -472,6 +539,11 @@ std::string GLShader::fragment_interface_declare(const ShaderCreateInfo &info) c ss << "out " << to_string(output.type) << " " << output.name << ";\n"; } ss << "\n"; + + if (pre_main.empty() == false) { + std::string post_main = ""; + ss << main_function_wrapper(pre_main, post_main); + } return ss.str(); } @@ -503,7 +575,7 @@ static StageInterfaceInfo *find_interface_by_name(const Vector<StageInterfaceInf const StringRefNull &name) { for (auto *iface : ifaces) { - if (iface->name == name) { + if (iface->instance_name == name) { return iface; } } @@ -512,8 +584,8 @@ static StageInterfaceInfo *find_interface_by_name(const Vector<StageInterfaceInf std::string GLShader::geometry_interface_declare(const ShaderCreateInfo &info) const { - std::stringstream ss; + ss << "\n/* Interfaces. */\n"; for (const StageInterfaceInfo *iface : info.vertex_out_interfaces_) { bool has_matching_output_iface = find_interface_by_name(info.geometry_out_interfaces_, @@ -547,6 +619,76 @@ std::string GLShader::compute_layout_declare(const ShaderCreateInfo &info) const ss << "\n"; return ss.str(); } +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Passthrough geometry shader emulation + * + * \{ */ + +std::string GLShader::workaround_geometry_shader_source_create( + const shader::ShaderCreateInfo &info) +{ + std::stringstream ss; + + const bool do_layer_workaround = !GLContext::layered_rendering_support && + bool(info.builtins_ & BuiltinBits::LAYER); + const bool do_barycentric_workaround = !GLContext::native_barycentric_support && + bool(info.builtins_ & BuiltinBits::BARYCENTRIC_COORD); + + shader::ShaderCreateInfo info_modified = info; + info_modified.geometry_out_interfaces_ = info_modified.vertex_out_interfaces_; + /** + * NOTE(@fclem): Assuming we will render TRIANGLES. This will not work with other primitive + * types. In this case, it might not trigger an error on some implementations. + */ + info_modified.geometry_layout(PrimitiveIn::TRIANGLES, PrimitiveOut::TRIANGLE_STRIP, 3); + + ss << geometry_layout_declare(info_modified); + ss << geometry_interface_declare(info_modified); + if (do_layer_workaround) { + ss << "in int gpu_Layer[];\n"; + } + if (do_barycentric_workaround) { + ss << "smooth out vec3 gpu_BaryCoord;\n"; + ss << "noperspective out vec3 gpu_BaryCoordNoPersp;\n"; + } + ss << "\n"; + + ss << "void main()\n"; + ss << "{\n"; + if (do_layer_workaround) { + ss << " gl_Layer = gpu_Layer[0];\n"; + } + for (auto i : IndexRange(3)) { + for (auto iface : info_modified.vertex_out_interfaces_) { + for (auto &inout : iface->inouts) { + ss << " " << iface->instance_name << "_out." << inout.name; + ss << " = " << iface->instance_name << "_in[" << i << "]." << inout.name << ";\n"; + } + } + if (do_barycentric_workaround) { + ss << " gpu_BaryCoordNoPersp = gpu_BaryCoord ="; + ss << " vec3(" << int(i == 0) << ", " << int(i == 1) << ", " << int(i == 2) << ");\n"; + } + ss << " gl_Position = gl_in[" << i << "].gl_Position;\n"; + ss << " EmitVertex();\n"; + } + ss << "}\n"; + return ss.str(); +} + +bool GLShader::do_geometry_shader_injection(const shader::ShaderCreateInfo *info) +{ + BuiltinBits builtins = info->builtins_; + if (!GLContext::native_barycentric_support && bool(builtins & BuiltinBits::BARYCENTRIC_COORD)) { + return true; + } + if (!GLContext::layered_rendering_support && bool(builtins & BuiltinBits::LAYER)) { + return true; + } + return false; +} /** \} */ @@ -557,7 +699,7 @@ std::string GLShader::compute_layout_declare(const ShaderCreateInfo &info) const static char *glsl_patch_default_get() { /** Used for shader patching. Init once. */ - static char patch[700] = "\0"; + static char patch[1024] = "\0"; if (patch[0] != '\0') { return patch; } @@ -601,6 +743,13 @@ static char *glsl_patch_default_get() STR_CONCAT(patch, slen, "#extension GL_ARB_shader_image_load_store: enable\n"); STR_CONCAT(patch, slen, "#extension GL_ARB_shading_language_420pack: enable\n"); } + if (GLContext::layered_rendering_support) { + STR_CONCAT(patch, slen, "#extension GL_AMD_vertex_shader_layer: enable\n"); + STR_CONCAT(patch, slen, "#define gpu_Layer gl_Layer\n"); + } + if (GLContext::native_barycentric_support) { + STR_CONCAT(patch, slen, "#extension GL_AMD_shader_explicit_vertex_parameter: enable\n"); + } /* Fallbacks. */ if (!GLContext::shader_draw_parameters_support) { @@ -717,6 +866,14 @@ bool GLShader::finalize(const shader::ShaderCreateInfo *info) return false; } + if (info && do_geometry_shader_injection(info)) { + std::string source = workaround_geometry_shader_source_create(*info); + Vector<const char *> sources; + sources.append("version"); + sources.append(source.c_str()); + geometry_shader_from_glsl(sources); + } + glLinkProgram(shader_program_); GLint status; |