/*
 * Copyright 2019 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef GrProgramInfo_DEFINED
#define GrProgramInfo_DEFINED

#include "include/gpu/GrTypes.h"
#include "src/gpu/GrGeometryProcessor.h"
#include "src/gpu/GrPipeline.h"

class GrStencilSettings;

class GrProgramInfo {
public:
    GrProgramInfo(const GrCaps& caps,
                  const GrSurfaceProxyView& targetView,
                  bool usesMSAASurface,
                  const GrPipeline* pipeline,
                  const GrUserStencilSettings* userStencilSettings,
                  const GrGeometryProcessor* geomProc,
                  GrPrimitiveType primitiveType,
                  uint8_t tessellationPatchVertexCount,
                  GrXferBarrierFlags renderPassXferBarriers,
                  GrLoadOp colorLoadOp)
            : fNeedsStencil(targetView.asRenderTargetProxy()->needsStencil())
            , fBackendFormat(targetView.proxy()->backendFormat())
            , fOrigin(targetView.origin())
            , fTargetHasVkResolveAttachmentWithInput(
                    targetView.asRenderTargetProxy()->supportsVkInputAttachment() &&
                    ((targetView.asRenderTargetProxy()->numSamples() > 1 &&
                     targetView.asTextureProxy()) ||
                    targetView.asRenderTargetProxy()->numSamples() == 1))
            , fTargetsNumSamples(targetView.asRenderTargetProxy()->numSamples())
            , fPipeline(pipeline)
            , fUserStencilSettings(userStencilSettings)
            , fGeomProc(geomProc)
            , fPrimitiveType(primitiveType)
            , fTessellationPatchVertexCount(tessellationPatchVertexCount)
            , fRenderPassXferBarriers(renderPassXferBarriers)
            , fColorLoadOp(colorLoadOp) {
        SkASSERT(fTargetsNumSamples > 0);
        fNumSamples = fTargetsNumSamples;
        if (fNumSamples == 1 && usesMSAASurface) {
            fNumSamples = caps.internalMultisampleCount(this->backendFormat());
        }
        SkASSERT((GrPrimitiveType::kPatches == fPrimitiveType) ==
                 (fTessellationPatchVertexCount > 0));
        SkDEBUGCODE(this->validate(false);)
    }

    int numSamples() const { return fNumSamples; }
    int needsStencil() const { return fNeedsStencil; }
    bool isStencilEnabled() const {
        return fUserStencilSettings != &GrUserStencilSettings::kUnused ||
               fPipeline->hasStencilClip();
    }
    const GrUserStencilSettings* userStencilSettings() const { return fUserStencilSettings; }
    // The backend format of the destination render target [proxy]
    const GrBackendFormat& backendFormat() const { return fBackendFormat; }
    GrSurfaceOrigin origin() const { return fOrigin; }
    const GrPipeline& pipeline() const { return *fPipeline; }
    const GrGeometryProcessor& geomProc() const { return *fGeomProc; }

    GrPrimitiveType primitiveType() const { return fPrimitiveType; }
    uint8_t tessellationPatchVertexCount() const {
        SkASSERT(GrPrimitiveType::kPatches == fPrimitiveType);
        return fTessellationPatchVertexCount;
    }

    bool targetHasVkResolveAttachmentWithInput() const {
        return fTargetHasVkResolveAttachmentWithInput;
    }

    int targetsNumSamples() const { return fTargetsNumSamples; }

    GrXferBarrierFlags renderPassBarriers() const { return fRenderPassXferBarriers; }

    GrLoadOp colorLoadOp() const { return fColorLoadOp; }

    uint16_t primitiveTypeKey() const {
        return ((uint16_t)fPrimitiveType << 8) | fTessellationPatchVertexCount;
    }

    // For Dawn, Metal and Vulkan the number of stencil bits is known a priori so we can
    // create the stencil settings here.
    GrStencilSettings nonGLStencilSettings() const;

    // Invokes the visitor function on all FP proxies in the pipeline. The caller is responsible
    // to call the visitor on its own primProc proxies.
    void visitFPProxies(const GrVisitProxyFunc& func) const { fPipeline->visitProxies(func); }

#ifdef SK_DEBUG
    void validate(bool flushTime) const;
    void checkAllInstantiated() const;
    void checkMSAAAndMIPSAreResolved() const;
#endif

private:
    int                                   fNumSamples;
    bool                                  fNeedsStencil;
    GrBackendFormat                       fBackendFormat;
    GrSurfaceOrigin                       fOrigin;
    bool                                  fTargetHasVkResolveAttachmentWithInput;
    int                                   fTargetsNumSamples;
    const GrPipeline*                     fPipeline;
    const GrUserStencilSettings*          fUserStencilSettings;
    const GrGeometryProcessor*            fGeomProc;
    GrPrimitiveType                       fPrimitiveType;
    uint8_t                               fTessellationPatchVertexCount;  // GrPrimType::kPatches.
    GrXferBarrierFlags                    fRenderPassXferBarriers;
    GrLoadOp                              fColorLoadOp;
};

#endif