From 864cbbaf4cec524815d05e2053a460c944e6c719 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Wed, 21 Nov 2018 02:11:47 -0300
Subject: [PATCH] gl_shader_decompiler: Fix register overwriting on texture
calls
---
.../renderer_opengl/gl_shader_decompiler.cpp | 138 ++++++++++--------
1 file changed, 78 insertions(+), 60 deletions(-)
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index 90a88b91a9..f4fa6c74a4 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -1243,14 +1243,7 @@ private:
regs.SetRegisterToInteger(dest, true, 0, result, 1, 1);
}
- void WriteTexsInstruction(const Instruction& instr, const std::string& coord,
- const std::string& texture) {
- // Add an extra scope and declare the texture coords inside to prevent
- // overwriting them in case they are used as outputs of the texs instruction.
- shader.AddLine('{');
- ++shader.scope;
- shader.AddLine(coord);
-
+ void WriteTexsInstruction(const Instruction& instr, const std::string& texture) {
// TEXS has two destination registers and a swizzle. The first two elements in the swizzle
// go into gpr0+0 and gpr0+1, and the rest goes into gpr28+0 and gpr28+1
@@ -1273,9 +1266,6 @@ private:
++written_components;
}
-
- --shader.scope;
- shader.AddLine('}');
}
static u32 TextureCoordinates(Tegra::Shader::TextureType texture_type) {
@@ -2563,7 +2553,6 @@ private:
}
// TODO: make sure coordinates are always indexed to gpr8 and gpr20 is always bias
// or lod.
- std::string op_c;
const std::string sampler =
GetSampler(instr.sampler, texture_type, is_array, depth_compare);
@@ -2586,27 +2575,35 @@ private:
}
case Tegra::Shader::TextureProcessMode::LB:
case Tegra::Shader::TextureProcessMode::LBA: {
- if (depth_compare) {
- if (is_array)
- op_c = regs.GetRegisterAsFloat(instr.gpr20.Value() + 2);
- else
- op_c = regs.GetRegisterAsFloat(instr.gpr20.Value() + 1);
- } else {
- op_c = regs.GetRegisterAsFloat(instr.gpr20);
- }
+ const std::string bias = [&]() {
+ if (depth_compare) {
+ if (is_array)
+ return regs.GetRegisterAsFloat(instr.gpr20.Value() + 2);
+ else
+ return regs.GetRegisterAsFloat(instr.gpr20.Value() + 1);
+ } else {
+ return regs.GetRegisterAsFloat(instr.gpr20);
+ }
+ }();
+ shader.AddLine("float bias = " + bias + ';');
+
// TODO: Figure if A suffix changes the equation at all.
- texture = "texture(" + sampler + ", coords, " + op_c + ')';
+ texture = "texture(" + sampler + ", coords, bias)";
break;
}
case Tegra::Shader::TextureProcessMode::LL:
case Tegra::Shader::TextureProcessMode::LLA: {
- if (num_coordinates <= 2) {
- op_c = regs.GetRegisterAsFloat(instr.gpr20);
- } else {
- op_c = regs.GetRegisterAsFloat(instr.gpr20.Value() + 1);
- }
+ const std::string lod = [&]() {
+ if (num_coordinates <= 2) {
+ return regs.GetRegisterAsFloat(instr.gpr20);
+ } else {
+ return regs.GetRegisterAsFloat(instr.gpr20.Value() + 1);
+ }
+ }();
+ shader.AddLine("float lod = " + lod + ';');
+
// TODO: Figure if A suffix changes the equation at all.
- texture = "textureLod(" + sampler + ", coords, " + op_c + ')';
+ texture = "textureLod(" + sampler + ", coords, lod)";
break;
}
default: {
@@ -2633,7 +2630,6 @@ private:
break;
}
case OpCode::Id::TEXS: {
- std::string coord;
Tegra::Shader::TextureType texture_type{instr.texs.GetTextureType()};
bool is_array{instr.texs.IsArrayTexture()};
@@ -2646,17 +2642,21 @@ private:
if (depth_compare)
num_coordinates += 1;
+ // Scope to avoid variable name overlaps.
+ shader.AddLine('{');
+ ++shader.scope;
+
switch (num_coordinates) {
case 2: {
if (is_array) {
const std::string index = regs.GetRegisterAsInteger(instr.gpr8);
const std::string x = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
const std::string y = regs.GetRegisterAsFloat(instr.gpr20);
- coord = "vec3 coords = vec3(" + x + ", " + y + ", " + index + ");";
+ shader.AddLine("vec3 coords = vec3(" + x + ", " + y + ", " + index + ");");
} else {
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr20);
- coord = "vec2 coords = vec2(" + x + ", " + y + ");";
+ shader.AddLine("vec2 coords = vec2(" + x + ", " + y + ");");
}
break;
}
@@ -2666,13 +2666,13 @@ private:
const std::string x = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
const std::string y = regs.GetRegisterAsFloat(instr.gpr8.Value() + 2);
const std::string z = regs.GetRegisterAsFloat(instr.gpr20);
- coord =
- "vec4 coords = vec4(" + x + ", " + y + ", " + z + ", " + index + ");";
+ shader.AddLine("vec4 coords = vec4(" + x + ", " + y + ", " + z + ", " +
+ index + ");");
} else {
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
const std::string z = regs.GetRegisterAsFloat(instr.gpr20);
- coord = "vec3 coords = vec3(" + x + ", " + y + ", " + z + ");";
+ shader.AddLine("vec3 coords = vec3(" + x + ", " + y + ", " + z + ");");
}
break;
}
@@ -2683,7 +2683,7 @@ private:
// Fallback to interpreting as a 2D texture for now
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr20);
- coord = "vec2 coords = vec2(" + x + ", " + y + ");";
+ shader.AddLine("vec2 coords = vec2(" + x + ", " + y + ");");
texture_type = Tegra::Shader::TextureType::Texture2D;
is_array = false;
}
@@ -2715,14 +2715,16 @@ private:
}
}
if (!depth_compare) {
- WriteTexsInstruction(instr, coord, texture);
+ WriteTexsInstruction(instr, texture);
} else {
- WriteTexsInstruction(instr, coord, "vec4(" + texture + ')');
+ WriteTexsInstruction(instr, "vec4(" + texture + ')');
}
+
+ shader.AddLine('}');
+ --shader.scope;
break;
}
case OpCode::Id::TLDS: {
- std::string coord;
const Tegra::Shader::TextureType texture_type{instr.tlds.GetTextureType()};
const bool is_array{instr.tlds.IsArrayTexture()};
@@ -2736,12 +2738,16 @@ private:
UNIMPLEMENTED_IF_MSG(instr.tlds.UsesMiscMode(Tegra::Shader::TextureMiscMode::MZ),
"MZ is not implemented");
- u32 op_c_offset = 0;
+ u32 extra_op_offset = 0;
+
+ // Scope to avoid variable name overlaps.
+ shader.AddLine('{');
+ ++shader.scope;
switch (texture_type) {
case Tegra::Shader::TextureType::Texture1D: {
const std::string x = regs.GetRegisterAsInteger(instr.gpr8);
- coord = "int coords = " + x + ';';
+ shader.AddLine("int coords = " + x + ';');
break;
}
case Tegra::Shader::TextureType::Texture2D: {
@@ -2749,8 +2755,8 @@ private:
const std::string x = regs.GetRegisterAsInteger(instr.gpr8);
const std::string y = regs.GetRegisterAsInteger(instr.gpr20);
- coord = "ivec2 coords = ivec2(" + x + ", " + y + ");";
- op_c_offset = 1;
+ shader.AddLine("ivec2 coords = ivec2(" + x + ", " + y + ");");
+ extra_op_offset = 1;
break;
}
default:
@@ -2765,9 +2771,10 @@ private:
break;
}
case Tegra::Shader::TextureProcessMode::LL: {
- const std::string op_c =
- regs.GetRegisterAsInteger(instr.gpr20.Value() + op_c_offset);
- texture = "texelFetch(" + sampler + ", coords, " + op_c + ')';
+ shader.AddLine(
+ "float lod = " +
+ regs.GetRegisterAsInteger(instr.gpr20.Value() + extra_op_offset) + ';');
+ texture = "texelFetch(" + sampler + ", coords, lod)";
break;
}
default: {
@@ -2776,7 +2783,10 @@ private:
static_cast<u32>(instr.tlds.GetTextureProcessMode()));
}
}
- WriteTexsInstruction(instr, coord, texture);
+ WriteTexsInstruction(instr, texture);
+
+ --shader.scope;
+ shader.AddLine('}');
break;
}
case OpCode::Id::TLD4: {
@@ -2799,18 +2809,23 @@ private:
if (depth_compare)
num_coordinates += 1;
+ // Add an extra scope and declare the texture coords inside to prevent
+ // overwriting them in case they are used as outputs of the texs instruction.
+ shader.AddLine('{');
+ ++shader.scope;
+
switch (num_coordinates) {
case 2: {
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
- coord = "vec2 coords = vec2(" + x + ", " + y + ");";
+ shader.AddLine("vec2 coords = vec2(" + x + ", " + y + ");");
break;
}
case 3: {
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
const std::string z = regs.GetRegisterAsFloat(instr.gpr8.Value() + 2);
- coord = "vec3 coords = vec3(" + x + ", " + y + ", " + z + ");";
+ shader.AddLine("vec3 coords = vec3(" + x + ", " + y + ", " + z + ");");
break;
}
default:
@@ -2818,17 +2833,13 @@ private:
static_cast<u32>(num_coordinates));
const std::string x = regs.GetRegisterAsFloat(instr.gpr8);
const std::string y = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
- coord = "vec2 coords = vec2(" + x + ", " + y + ");";
+ shader.AddLine("vec2 coords = vec2(" + x + ", " + y + ");");
texture_type = Tegra::Shader::TextureType::Texture2D;
}
const std::string sampler =
GetSampler(instr.sampler, texture_type, false, depth_compare);
- // Add an extra scope and declare the texture coords inside to prevent
- // overwriting them in case they are used as outputs of the texs instruction.
- shader.AddLine("{");
- ++shader.scope;
- shader.AddLine(coord);
+
const std::string texture = "textureGather(" + sampler + ", coords, " +
std::to_string(instr.tld4.component) + ')';
if (!depth_compare) {
@@ -2845,7 +2856,7 @@ private:
regs.SetRegisterToFloat(instr.gpr0, 0, texture, 1, 1, false);
}
--shader.scope;
- shader.AddLine("}");
+ shader.AddLine('}');
break;
}
case OpCode::Id::TLD4S: {
@@ -2856,6 +2867,10 @@ private:
instr.tld4s.UsesMiscMode(Tegra::Shader::TextureMiscMode::AOFFI),
"AOFFI is not implemented");
+ // Scope to avoid variable name overlaps.
+ shader.AddLine('{');
+ ++shader.scope;
+
const bool depth_compare =
instr.tld4s.UsesMiscMode(Tegra::Shader::TextureMiscMode::DC);
const std::string op_a = regs.GetRegisterAsFloat(instr.gpr8);
@@ -2863,22 +2878,25 @@ private:
// TODO(Subv): Figure out how the sampler type is encoded in the TLD4S instruction.
const std::string sampler = GetSampler(
instr.sampler, Tegra::Shader::TextureType::Texture2D, false, depth_compare);
- std::string coord;
if (!depth_compare) {
- coord = "vec2 coords = vec2(" + op_a + ", " + op_b + ");";
+ shader.AddLine("vec2 coords = vec2(" + op_a + ", " + op_b + ");");
} else {
// Note: TLD4S coordinate encoding works just like TEXS's
- const std::string op_c = regs.GetRegisterAsFloat(instr.gpr8.Value() + 1);
- coord = "vec3 coords = vec3(" + op_a + ", " + op_c + ", " + op_b + ");";
+ shader.AddLine(
+ "float op_y = " + regs.GetRegisterAsFloat(instr.gpr8.Value() + 1) + ';');
+ shader.AddLine("vec3 coords = vec3(" + op_a + ", op_y, " + op_b + ");");
}
const std::string texture = "textureGather(" + sampler + ", coords, " +
std::to_string(instr.tld4s.component) + ')';
if (!depth_compare) {
- WriteTexsInstruction(instr, coord, texture);
+ WriteTexsInstruction(instr, texture);
} else {
- WriteTexsInstruction(instr, coord, "vec4(" + texture + ')');
+ WriteTexsInstruction(instr, "vec4(" + texture + ')');
}
+
+ --shader.scope;
+ shader.AddLine('}');
break;
}
case OpCode::Id::TXQ: {
--
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