diff --git a/src/compiler/glsl/lower_precision.cpp b/src/compiler/glsl/lower_precision.cpp index 44cc7969204..b410e3290a2 100644 --- a/src/compiler/glsl/lower_precision.cpp +++ b/src/compiler/glsl/lower_precision.cpp @@ -399,12 +399,13 @@ find_lowerable_rvalues_visitor::visit_enter(ir_expression *ir) stack.back().state = CANT_LOWER; /* Don't lower precision for derivative calculations */ - if (ir->operation == ir_unop_dFdx || - ir->operation == ir_unop_dFdx_coarse || - ir->operation == ir_unop_dFdx_fine || - ir->operation == ir_unop_dFdy || - ir->operation == ir_unop_dFdy_coarse || - ir->operation == ir_unop_dFdy_fine) { + if (!options->LowerPrecisionDerivatives && + (ir->operation == ir_unop_dFdx || + ir->operation == ir_unop_dFdx_coarse || + ir->operation == ir_unop_dFdx_fine || + ir->operation == ir_unop_dFdy || + ir->operation == ir_unop_dFdy_coarse || + ir->operation == ir_unop_dFdy_fine)) { stack.back().state = CANT_LOWER; } diff --git a/src/compiler/glsl/standalone.cpp b/src/compiler/glsl/standalone.cpp index 02f019e0bde..5b34297df59 100644 --- a/src/compiler/glsl/standalone.cpp +++ b/src/compiler/glsl/standalone.cpp @@ -440,6 +440,7 @@ standalone_compile_shader(const struct standalone_options *_options, &ctx->Const.ShaderCompilerOptions[i]; options->LowerPrecisionFloat16 = true; options->LowerPrecisionInt16 = true; + options->LowerPrecisionDerivatives = true; } } diff --git a/src/compiler/glsl/tests/lower_precision_test.py b/src/compiler/glsl/tests/lower_precision_test.py index 0934e61e4ab..3626d8d2a4b 100644 --- a/src/compiler/glsl/tests/lower_precision_test.py +++ b/src/compiler/glsl/tests/lower_precision_test.py @@ -1035,6 +1035,34 @@ TESTS = [ } """, r'\(expression +uint16_t min'), + Test("dFdx", + """ + #version 300 es + precision mediump float; + + in vec4 var; + out vec4 color; + + void main() + { + color = dFdx(var); + } + """, + r'\(expression +f16vec4 +dFdx +\(expression +f16vec4'), + Test("dFdy", + """ + #version 300 es + precision mediump float; + + in vec4 var; + out vec4 color; + + void main() + { + color = dFdy(var); + } + """, + r'\(expression +f16vec4 +dFdy +\(expression +f16vec4'), ] diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h index 5eb4ba625d4..eff6f496eb6 100644 --- a/src/mesa/main/mtypes.h +++ b/src/mesa/main/mtypes.h @@ -3208,6 +3208,7 @@ struct gl_shader_compiler_options */ GLboolean LowerPrecisionFloat16; GLboolean LowerPrecisionInt16; + GLboolean LowerPrecisionDerivatives; /** * \name Forms of indirect addressing the driver cannot do.