GrVkVaryingHandler.cpp File Reference

#include "src/gpu/ganesh/vk/GrVkVaryingHandler.h"

Go to the source code of this file.

Functions
static int	sksltype_to_location_size (SkSLType type)
static void	finalize_helper (GrVkVaryingHandler::VarArray &vars)

Function Documentation

finalize_helper()

static void finalize_helper ( GrVkVaryingHandler::VarArray &  vars )

static

Definition at line 76 of file GrVkVaryingHandler.cpp.

                                                              {
    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);
}

sksltype_to_location_size()

static int sksltype_to_location_size ( SkSLType  type )

inlinestatic

Returns the number of locations take up by a given SkSLType. We assume that all scalar values are 32 bits.

Definition at line 12 of file GrVkVaryingHandler.cpp.

                                                           {
    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");
}