GLSL: special-case BinaryOp::kModulo for floating point.

The '%' operator in GLSL is integer-only. Use the full OpFRem
expression: (a - b * trunc(a / b)).

Bug: tint:1270
Change-Id: I0a969983bef132e004ce456d4a738488e400a61b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/68760
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>

test/tint/expressions/binary/mod_by_zero/by_constant/scalar-scalar/f32.wgsl.expected.glsl

@@ -1,9 +1,12 @@
-SKIP: FAILED
-
 #version 310 es
 
+float tint_float_modulo(float lhs, float rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
-  float r = (1.0f % 0.0f);
+  float r = tint_float_modulo(1.0f, 0.0f);
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -11,10 +14,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:4: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' const float' and a right operand of type ' const float' (or there is no acceptable conversion)
-ERROR: 0:4: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-

test/tint/expressions/binary/mod_by_zero/by_constant/vec3-vec3/f32.wgsl.expected.glsl

@@ -1,11 +1,14 @@
-SKIP: FAILED
-
 #version 310 es
 
+vec3 tint_float_modulo(vec3 lhs, vec3 rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
   vec3 a = vec3(1.0f, 2.0f, 3.0f);
   vec3 b = vec3(0.0f, 5.0f, 0.0f);
-  vec3 r = (a % b);
+  vec3 r = tint_float_modulo(a, b);
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -13,10 +16,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:6: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' temp highp 3-component vector of float' and a right operand of type ' temp highp 3-component vector of float' (or there is no acceptable conversion)
-ERROR: 0:6: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-

test/tint/expressions/binary/mod_by_zero/by_expression/scalar-scalar/f32.wgsl.expected.glsl

@@ -1,11 +1,14 @@
-SKIP: FAILED
-
 #version 310 es
 
+float tint_float_modulo(float lhs, float rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
   float a = 1.0f;
   float b = 0.0f;
-  float r = (a % (b + b));
+  float r = tint_float_modulo(a, (b + b));
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -13,10 +16,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:6: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' temp highp float' and a right operand of type ' temp highp float' (or there is no acceptable conversion)
-ERROR: 0:6: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-

test/tint/expressions/binary/mod_by_zero/by_expression/vec3-vec3/f32.wgsl.expected.glsl

@@ -1,11 +1,14 @@
-SKIP: FAILED
-
 #version 310 es
 
+vec3 tint_float_modulo(vec3 lhs, vec3 rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
   vec3 a = vec3(1.0f, 2.0f, 3.0f);
   vec3 b = vec3(0.0f, 5.0f, 0.0f);
-  vec3 r = (a % (b + b));
+  vec3 r = tint_float_modulo(a, (b + b));
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -13,10 +16,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:6: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' temp highp 3-component vector of float' and a right operand of type ' temp highp 3-component vector of float' (or there is no acceptable conversion)
-ERROR: 0:6: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-

test/tint/expressions/binary/mod_by_zero/by_identifier/scalar-scalar/f32.wgsl.expected.glsl

@@ -1,11 +1,14 @@
-SKIP: FAILED
-
 #version 310 es
 
+float tint_float_modulo(float lhs, float rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
   float a = 1.0f;
   float b = 0.0f;
-  float r = (a % b);
+  float r = tint_float_modulo(a, b);
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -13,10 +16,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:6: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' temp highp float' and a right operand of type ' temp highp float' (or there is no acceptable conversion)
-ERROR: 0:6: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-

test/tint/expressions/binary/mod_by_zero/by_identifier/vec3-vec3/f32.wgsl.expected.glsl

@@ -1,11 +1,14 @@
-SKIP: FAILED
-
 #version 310 es
 
+vec3 tint_float_modulo(vec3 lhs, vec3 rhs) {
+  return (lhs - rhs * trunc(lhs / rhs));
+}
+
+
 void f() {
   vec3 a = vec3(1.0f, 2.0f, 3.0f);
   vec3 b = vec3(0.0f, 5.0f, 0.0f);
-  vec3 r = (a % b);
+  vec3 r = tint_float_modulo(a, b);
 }
 
 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
@@ -13,10 +16,3 @@ void main() {
   f();
   return;
 }
-Error parsing GLSL shader:
-ERROR: 0:6: '%' :  wrong operand types: no operation '%' exists that takes a left-hand operand of type ' temp highp 3-component vector of float' and a right operand of type ' temp highp 3-component vector of float' (or there is no acceptable conversion)
-ERROR: 0:6: '' : compilation terminated 
-ERROR: 2 compilation errors.  No code generated.
-
-
-