angletypes.cpp

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Author : Corentin Wallez
Date : 2018-02-27 15:17:10
Hash : 99d492c2
Message : Use packed enums for the texture types and targets, part 2 This completes the refactor by using the packed enums in the gl:: layer and in the backends. The packed enum code generation is modified to support explicitly assigning values to the packed enums so that the TextureTarget cube map faces are in the correct order and easy to iterate over. BUG=angleproject:2169 Change-Id: I5903235e684ccf382e92a8a1e10c5c85b4b16a04 Reviewed-on: https://chromium-review.googlesource.com/939994 Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/libANGLE/angletypes.cpp
//
// Copyright (c) 2013 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// angletypes.h : Defines a variety of structures and enum types that are used throughout libGLESv2

#include "libANGLE/angletypes.h"
#include "libANGLE/Program.h"
#include "libANGLE/VertexAttribute.h"
#include "libANGLE/State.h"
#include "libANGLE/VertexArray.h"

namespace gl
{

PrimitiveType GetPrimitiveType(GLenum drawMode)
{
    switch (drawMode)
    {
        case GL_POINTS:
            return PRIMITIVE_POINTS;
        case GL_LINES:
            return PRIMITIVE_LINES;
        case GL_LINE_STRIP:
            return PRIMITIVE_LINE_STRIP;
        case GL_LINE_LOOP:
            return PRIMITIVE_LINE_LOOP;
        case GL_TRIANGLES:
            return PRIMITIVE_TRIANGLES;
        case GL_TRIANGLE_STRIP:
            return PRIMITIVE_TRIANGLE_STRIP;
        case GL_TRIANGLE_FAN:
            return PRIMITIVE_TRIANGLE_FAN;
        default:
            UNREACHABLE();
            return PRIMITIVE_TYPE_MAX;
    }
}

RasterizerState::RasterizerState()
{
    memset(this, 0, sizeof(RasterizerState));

    rasterizerDiscard   = false;
    cullFace            = false;
    cullMode            = CullFaceMode::Back;
    frontFace           = GL_CCW;
    polygonOffsetFill   = false;
    polygonOffsetFactor = 0.0f;
    polygonOffsetUnits  = 0.0f;
    pointDrawMode       = false;
    multiSample         = false;
}

bool operator==(const RasterizerState &a, const RasterizerState &b)
{
    return memcmp(&a, &b, sizeof(RasterizerState)) == 0;
}

bool operator!=(const RasterizerState &a, const RasterizerState &b)
{
    return !(a == b);
}

BlendState::BlendState()
{
    memset(this, 0, sizeof(BlendState));

    blend                 = false;
    sourceBlendRGB        = GL_ONE;
    sourceBlendAlpha      = GL_ONE;
    destBlendRGB          = GL_ZERO;
    destBlendAlpha        = GL_ZERO;
    blendEquationRGB      = GL_FUNC_ADD;
    blendEquationAlpha    = GL_FUNC_ADD;
    sampleAlphaToCoverage = false;
    dither                = true;
}

BlendState::BlendState(const BlendState &other)
{
    memcpy(this, &other, sizeof(BlendState));
}

bool operator==(const BlendState &a, const BlendState &b)
{
    return memcmp(&a, &b, sizeof(BlendState)) == 0;
}

bool operator!=(const BlendState &a, const BlendState &b)
{
    return !(a == b);
}

DepthStencilState::DepthStencilState()
{
    memset(this, 0, sizeof(DepthStencilState));

    depthTest                = false;
    depthFunc                = GL_LESS;
    depthMask                = true;
    stencilTest              = false;
    stencilFunc              = GL_ALWAYS;
    stencilMask              = static_cast<GLuint>(-1);
    stencilWritemask         = static_cast<GLuint>(-1);
    stencilBackFunc          = GL_ALWAYS;
    stencilBackMask          = static_cast<GLuint>(-1);
    stencilBackWritemask     = static_cast<GLuint>(-1);
    stencilFail              = GL_KEEP;
    stencilPassDepthFail     = GL_KEEP;
    stencilPassDepthPass     = GL_KEEP;
    stencilBackFail          = GL_KEEP;
    stencilBackPassDepthFail = GL_KEEP;
    stencilBackPassDepthPass = GL_KEEP;
}

DepthStencilState::DepthStencilState(const DepthStencilState &other)
{
    memcpy(this, &other, sizeof(DepthStencilState));
}

bool operator==(const DepthStencilState &a, const DepthStencilState &b)
{
    return memcmp(&a, &b, sizeof(DepthStencilState)) == 0;
}

bool operator!=(const DepthStencilState &a, const DepthStencilState &b)
{
    return !(a == b);
}

SamplerState::SamplerState()
{
    memset(this, 0, sizeof(SamplerState));

    minFilter     = GL_NEAREST_MIPMAP_LINEAR;
    magFilter     = GL_LINEAR;
    wrapS         = GL_REPEAT;
    wrapT         = GL_REPEAT;
    wrapR         = GL_REPEAT;
    maxAnisotropy = 1.0f;
    minLod        = -1000.0f;
    maxLod        = 1000.0f;
    compareMode   = GL_NONE;
    compareFunc   = GL_LEQUAL;
    sRGBDecode    = GL_DECODE_EXT;
}

SamplerState::SamplerState(const SamplerState &other) = default;

// static
SamplerState SamplerState::CreateDefaultForTarget(TextureType type)
{
    SamplerState state;

    // According to OES_EGL_image_external and ARB_texture_rectangle: For external textures, the
    // default min filter is GL_LINEAR and the default s and t wrap modes are GL_CLAMP_TO_EDGE.
    if (type == TextureType::External || type == TextureType::Rectangle)
    {
        state.minFilter = GL_LINEAR;
        state.wrapS     = GL_CLAMP_TO_EDGE;
        state.wrapT     = GL_CLAMP_TO_EDGE;
    }

    return state;
}

ImageUnit::ImageUnit()
    : texture(), level(0), layered(false), layer(0), access(GL_READ_ONLY), format(GL_R32UI)
{
}

ImageUnit::ImageUnit(const ImageUnit &other) = default;

ImageUnit::~ImageUnit() = default;

static void MinMax(int a, int b, int *minimum, int *maximum)
{
    if (a < b)
    {
        *minimum = a;
        *maximum = b;
    }
    else
    {
        *minimum = b;
        *maximum = a;
    }
}

bool ClipRectangle(const Rectangle &source, const Rectangle &clip, Rectangle *intersection)
{
    int minSourceX, maxSourceX, minSourceY, maxSourceY;
    MinMax(source.x, source.x + source.width, &minSourceX, &maxSourceX);
    MinMax(source.y, source.y + source.height, &minSourceY, &maxSourceY);

    int minClipX, maxClipX, minClipY, maxClipY;
    MinMax(clip.x, clip.x + clip.width, &minClipX, &maxClipX);
    MinMax(clip.y, clip.y + clip.height, &minClipY, &maxClipY);

    if (minSourceX >= maxClipX || maxSourceX <= minClipX || minSourceY >= maxClipY || maxSourceY <= minClipY)
    {
        if (intersection)
        {
            intersection->x = minSourceX;
            intersection->y = maxSourceY;
            intersection->width = maxSourceX - minSourceX;
            intersection->height = maxSourceY - minSourceY;
        }

        return false;
    }
    else
    {
        if (intersection)
        {
            intersection->x = std::max(minSourceX, minClipX);
            intersection->y = std::max(minSourceY, minClipY);
            intersection->width  = std::min(maxSourceX, maxClipX) - std::max(minSourceX, minClipX);
            intersection->height = std::min(maxSourceY, maxClipY) - std::max(minSourceY, minClipY);
        }

        return true;
    }
}

bool Box::operator==(const Box &other) const
{
    return (x == other.x && y == other.y && z == other.z &&
            width == other.width && height == other.height && depth == other.depth);
}

bool Box::operator!=(const Box &other) const
{
    return !(*this == other);
}

bool operator==(const Offset &a, const Offset &b)
{
    return a.x == b.x && a.y == b.y && a.z == b.z;
}

bool operator!=(const Offset &a, const Offset &b)
{
    return !(a == b);
}

bool operator==(const Extents &lhs, const Extents &rhs)
{
    return lhs.width == rhs.width && lhs.height == rhs.height && lhs.depth == rhs.depth;
}

bool operator!=(const Extents &lhs, const Extents &rhs)
{
    return !(lhs == rhs);
}

ComponentTypeMask::ComponentTypeMask()
{
    mTypeMask.reset();
}

ComponentTypeMask::ComponentTypeMask(const ComponentTypeMask &other) = default;

ComponentTypeMask::~ComponentTypeMask() = default;

void ComponentTypeMask::reset()
{
    mTypeMask.reset();
}

bool ComponentTypeMask::none()
{
    return mTypeMask.none();
}

void ComponentTypeMask::setIndex(GLenum type, size_t index)
{
    ASSERT(index <= MAX_COMPONENT_TYPE_MASK_INDEX);

    mTypeMask &= ~(0x10001 << index);

    uint32_t m = 0;
    switch (type)
    {
        case GL_INT:
            m = 0x00001;
            break;
        case GL_UNSIGNED_INT:
            m = 0x10000;
            break;
        case GL_FLOAT:
            m = 0x10001;
            break;
        case GL_NONE:
            m = 0x00000;
            break;
        default:
            UNREACHABLE();
    }

    mTypeMask |= m << index;
}

unsigned long ComponentTypeMask::to_ulong() const
{
    return mTypeMask.to_ulong();
}

void ComponentTypeMask::from_ulong(unsigned long mask)
{
    mTypeMask = mask;
}

bool ComponentTypeMask::Validate(unsigned long outputTypes,
                                 unsigned long inputTypes,
                                 unsigned long outputMask,
                                 unsigned long inputMask)
{
    static_assert(IMPLEMENTATION_MAX_DRAW_BUFFERS <= MAX_COMPONENT_TYPE_MASK_INDEX,
                  "Output/input masks should fit into 16 bits - 1 bit per draw buffer. The "
                  "corresponding type masks should fit into 32 bits - 2 bits per draw buffer.");
    static_assert(MAX_VERTEX_ATTRIBS <= MAX_COMPONENT_TYPE_MASK_INDEX,
                  "Output/input masks should fit into 16 bits - 1 bit per attrib. The "
                  "corresponding type masks should fit into 32 bits - 2 bits per attrib.");

    // For performance reasons, draw buffer and attribute type validation is done using bit masks.
    // We store two bits representing the type split, with the low bit in the lower 16 bits of the
    // variable, and the high bit in the upper 16 bits of the variable. This is done so we can AND
    // with the elswewhere used DrawBufferMask or AttributeMask.

    // OR the masks with themselves, shifted 16 bits. This is to match our split type bits.
    outputMask |= (outputMask << MAX_COMPONENT_TYPE_MASK_INDEX);
    inputMask |= (inputMask << MAX_COMPONENT_TYPE_MASK_INDEX);

    // To validate:
    // 1. Remove any indexes that are not enabled in the input (& inputMask)
    // 2. Remove any indexes that exist in output, but not in input (& outputMask)
    // 3. Use == to verify equality
    return (outputTypes & inputMask) == ((inputTypes & outputMask) & inputMask);
}

}  // namespace gl
kc3-lang/angle/src/libANGLE/angletypes.cpp

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kc3-lang/angle /src/libANGLE/angletypes.cpp
