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Merge pull request #1669 from ReinUsesLisp/fixup-gs

gl_shader_decompiler: Guard out of bound geometry shader input reads
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bunnei 2018-11-11 08:28:20 -08:00 committed by GitHub
commit eaee73f95d
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 24 additions and 15 deletions

View file

@ -121,12 +121,16 @@ GLint CachedShader::GetUniformLocation(const GLShader::SamplerEntry& sampler) {
}
GLuint CachedShader::LazyGeometryProgram(OGLProgram& target_program,
const std::string& glsl_topology,
const std::string& glsl_topology, u32 max_vertices,
const std::string& debug_name) {
if (target_program.handle != 0) {
return target_program.handle;
}
const std::string source{geometry_programs.code + "layout (" + glsl_topology + ") in;\n"};
std::string source = "#version 430 core\n";
source += "layout (" + glsl_topology + ") in;\n";
source += "#define MAX_VERTEX_INPUT " + std::to_string(max_vertices) + '\n';
source += geometry_programs.code;
OGLShader shader;
shader.Create(source.c_str(), GL_GEOMETRY_SHADER);
target_program.Create(true, shader.handle);

View file

@ -48,22 +48,23 @@ public:
}
switch (primitive_mode) {
case GL_POINTS:
return LazyGeometryProgram(geometry_programs.points, "points", "ShaderPoints");
return LazyGeometryProgram(geometry_programs.points, "points", 1, "ShaderPoints");
case GL_LINES:
case GL_LINE_STRIP:
return LazyGeometryProgram(geometry_programs.lines, "lines", "ShaderLines");
return LazyGeometryProgram(geometry_programs.lines, "lines", 2, "ShaderLines");
case GL_LINES_ADJACENCY:
case GL_LINE_STRIP_ADJACENCY:
return LazyGeometryProgram(geometry_programs.lines_adjacency, "lines_adjacency",
return LazyGeometryProgram(geometry_programs.lines_adjacency, "lines_adjacency", 4,
"ShaderLinesAdjacency");
case GL_TRIANGLES:
case GL_TRIANGLE_STRIP:
case GL_TRIANGLE_FAN:
return LazyGeometryProgram(geometry_programs.triangles, "triangles", "ShaderTriangles");
return LazyGeometryProgram(geometry_programs.triangles, "triangles", 3,
"ShaderTriangles");
case GL_TRIANGLES_ADJACENCY:
case GL_TRIANGLE_STRIP_ADJACENCY:
return LazyGeometryProgram(geometry_programs.triangles_adjacency, "triangles_adjacency",
"ShaderLines");
6, "ShaderTrianglesAdjacency");
default:
UNREACHABLE_MSG("Unknown primitive mode.");
}
@ -78,7 +79,7 @@ public:
private:
/// Generates a geometry shader or returns one that already exists.
GLuint LazyGeometryProgram(OGLProgram& target_program, const std::string& glsl_topology,
const std::string& debug_name);
u32 max_vertices, const std::string& debug_name);
VAddr addr;
Maxwell::ShaderProgram program_type;

View file

@ -494,10 +494,10 @@ public:
// instruction for now.
if (stage == Maxwell3D::Regs::ShaderStage::Geometry) {
// TODO(Rodrigo): nouveau sets some attributes after setting emitting a geometry
// shader. These instructions use a dirty register as buffer index. To avoid some
// drivers from complaining for the out of boundary writes, guard them.
const std::string buf_index{"min(" + GetRegisterAsInteger(buf_reg) + ", " +
std::to_string(MAX_GEOMETRY_BUFFERS - 1) + ')'};
// shader. These instructions use a dirty register as buffer index, to avoid some
// drivers from complaining about out of boundary writes, guard them.
const std::string buf_index{"((" + GetRegisterAsInteger(buf_reg) + ") % " +
std::to_string(MAX_GEOMETRY_BUFFERS) + ')'};
shader.AddLine("amem[" + buf_index + "][" +
std::to_string(static_cast<u32>(attribute)) + ']' +
GetSwizzle(elem) + " = " + src + ';');
@ -811,7 +811,11 @@ private:
std::optional<Register> vertex = {}) {
auto GeometryPass = [&](const std::string& name) {
if (stage == Maxwell3D::Regs::ShaderStage::Geometry && vertex) {
return "gs_" + name + '[' + GetRegisterAsInteger(*vertex, 0, false) + ']';
// TODO(Rodrigo): Guard geometry inputs against out of bound reads. Some games set
// an 0x80000000 index for those and the shader fails to build. Find out why this
// happens and what's its intent.
return "gs_" + name + '[' + GetRegisterAsInteger(*vertex, 0, false) +
" % MAX_VERTEX_INPUT]";
}
return name;
};

View file

@ -82,8 +82,8 @@ void main() {
}
ProgramResult GenerateGeometryShader(const ShaderSetup& setup) {
std::string out = "#version 430 core\n";
out += "#extension GL_ARB_separate_shader_objects : enable\n\n";
// Version is intentionally skipped in shader generation, it's added by the lazy compilation.
std::string out = "#extension GL_ARB_separate_shader_objects : enable\n\n";
out += Decompiler::GetCommonDeclarations();
out += "bool exec_geometry();\n";