| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/ganesh/vk/GrVkVaryingHandler.h" |
| |
| /** Returns the number of locations take up by a given SkSLType. We assume that all |
| scalar values are 32 bits. */ |
| static inline int sksltype_to_location_size(SkSLType type) { |
| switch(type) { |
| case SkSLType::kVoid: |
| return 0; |
| case SkSLType::kFloat: // fall through |
| case SkSLType::kHalf: |
| return 1; |
| case SkSLType::kFloat2: // fall through |
| case SkSLType::kHalf2: |
| return 1; |
| case SkSLType::kFloat3: |
| case SkSLType::kHalf3: |
| return 1; |
| case SkSLType::kFloat4: |
| case SkSLType::kHalf4: |
| return 1; |
| case SkSLType::kInt2: |
| case SkSLType::kUInt2: |
| case SkSLType::kShort2: |
| case SkSLType::kUShort2: |
| return 1; |
| case SkSLType::kInt3: |
| case SkSLType::kUInt3: |
| case SkSLType::kShort3: |
| case SkSLType::kUShort3: |
| return 1; |
| case SkSLType::kInt4: |
| case SkSLType::kUInt4: |
| case SkSLType::kShort4: |
| case SkSLType::kUShort4: |
| return 1; |
| case SkSLType::kFloat2x2: |
| case SkSLType::kHalf2x2: |
| return 2; |
| case SkSLType::kFloat3x3: |
| case SkSLType::kHalf3x3: |
| return 3; |
| case SkSLType::kFloat4x4: |
| case SkSLType::kHalf4x4: |
| return 4; |
| case SkSLType::kTexture2DSampler: |
| case SkSLType::kSampler: |
| case SkSLType::kTexture2D: |
| case SkSLType::kInput: |
| return 0; |
| case SkSLType::kTextureExternalSampler: |
| return 0; |
| case SkSLType::kTexture2DRectSampler: |
| return 0; |
| case SkSLType::kBool: |
| case SkSLType::kBool2: |
| case SkSLType::kBool3: |
| case SkSLType::kBool4: |
| return 1; |
| case SkSLType::kInt: // fall through |
| case SkSLType::kShort: |
| return 1; |
| case SkSLType::kUInt: // fall through |
| case SkSLType::kUShort: |
| return 1; |
| } |
| SK_ABORT("Unexpected type"); |
| } |
| |
| static void finalize_helper(GrVkVaryingHandler::VarArray& vars) { |
| int locationIndex = 0; |
| for (GrShaderVar& var : vars.items()) { |
| SkString location; |
| location.appendf("location = %d", locationIndex); |
| var.addLayoutQualifier(location.c_str()); |
| |
| int elementSize = sksltype_to_location_size(var.getType()); |
| SkASSERT(elementSize > 0); |
| int numElements = var.isArray() ? var.getArrayCount() : 1; |
| SkASSERT(numElements > 0); |
| locationIndex += elementSize * numElements; |
| } |
| // Vulkan requires at least 64 locations to be supported for both vertex output and fragment |
| // input. If we ever hit this assert, then we'll need to add a cap to actually check the |
| // supported input and output values and adjust our supported shaders based on those values. |
| SkASSERT(locationIndex <= 64); |
| } |
| |
| void GrVkVaryingHandler::onFinalize() { |
| finalize_helper(fVertexInputs); |
| finalize_helper(fVertexOutputs); |
| finalize_helper(fFragInputs); |
| finalize_helper(fFragOutputs); |
| } |