am 6747be9f: Generate the SurfaceFlinger shader cache on initialization

ANDROID_SINGLETON_STATIC_INSTANCE(ProgramCache)

ProgramCache::ProgramCache() {

    // Until surfaceflinger has a dependable blob cache on the filesystem,

    // generate shaders on initialization so as to avoid jank.

    primeCache();

}

ProgramCache::~ProgramCache() {

}

void ProgramCache::primeCache() {

    uint32_t shaderCount = 0;

    uint32_t keyMask = Key::BLEND_MASK | Key::OPACITY_MASK |

                       Key::PLANE_ALPHA_MASK | Key::TEXTURE_MASK;

    // Prime the cache for all combinations of the above masks,

    // leaving off the experimental color matrix mask options.

    nsecs_t timeBefore = systemTime();

    for (uint32_t keyVal = 0; keyVal <= keyMask; keyVal++) {

        Key shaderKey;

        shaderKey.set(keyMask, keyVal);

        uint32_t tex = shaderKey.getTextureTarget();

        if (tex != Key::TEXTURE_OFF &&

            tex != Key::TEXTURE_EXT &&

            tex != Key::TEXTURE_2D) {

            continue;

        }

        Program* program = mCache.valueFor(shaderKey);

        if (program == NULL) {

            program = generateProgram(shaderKey);

            mCache.add(shaderKey, program);

            shaderCount++;

        }

    }

    nsecs_t timeAfter = systemTime();

    float compileTimeMs = static_cast<float>(timeAfter - timeBefore) / 1.0E6;

    ALOGD("shader cache generated - %u shaders in %f ms\n", shaderCount, compileTimeMs);

}

ProgramCache::Key ProgramCache::computeKey(const Description& description) {

    Key needs;

    needs.set(Key::TEXTURE_MASK,

    void useProgram(const Description& description);

private:

    // Generate shaders to populate the cache

    void primeCache();

    // compute a cache Key from a Description

    static Key computeKey(const Description& description);

    // generates a program from the Key