Method writeCombOper

src/core/gpu/gpu_cmd.cpp:469–511

}

template <int i> void Gpu::writeCombOper(uint32_t mask, uint32_t value) {
    // Write to some of the texture combiner operands
    mask &= 0x777FFF;
    gpuCombOper[i] = (gpuCombOper[i] & ~mask) | (value & mask);

    // Set RGB operands for the renderer if they're valid
    CombOper opers[6];
    for (int j = 0; j < 3; j++) {
        switch (uint8_t oper = (gpuCombOper[i] >> (j * 4)) & 0xF) {
            case 0x0: opers[j] = OPER_SRC; continue;
            case 0x1: opers[j] = OPER_1MSRC; continue;
            case 0x2: opers[j] = OPER_SRCA; continue;
            case 0x3: opers[j] = OPER_1MSRCA; continue;
            case 0x4: opers[j] = OPER_SRCR; continue;
            case 0x5: opers[j] = OPER_1MSRCR; continue;
            case 0x8: opers[j] = OPER_SRCG; continue;
            case 0x9: opers[j] = OPER_1MSRCG; continue;
            case 0xC: opers[j] = OPER_SRCB; continue;
            case 0xD: opers[j] = OPER_1MSRCB; continue;

        default:
            // Catch unknown RGB operand values
            LOG_WARN("GPU texture combiner %d operand %d set to unknown value: 0x%X\n", i, j, oper);
            opers[j] = OPER_SRC;
            continue;
        }
    }

    // Set alpha operands for the renderer
    for (int j = 3; j < 6; j++) {
        switch ((gpuCombOper[i] >> (j * 4)) & 0x7) {
            case 0x0: opers[j] = OPER_SRCA; continue;
            case 0x1: opers[j] = OPER_1MSRCA; continue;
            case 0x2: opers[j] = OPER_SRCR; continue;
            case 0x3: opers[j] = OPER_1MSRCR; continue;
            case 0x4: opers[j] = OPER_SRCG; continue;
            case 0x5: opers[j] = OPER_1MSRCG; continue;
            case 0x6: opers[j] = OPER_SRCB; continue;
            default: opers[j] = OPER_1MSRCB; continue;
        }
    }
    gpuRender->setCombOpers(i, opers);
}

template <int i> void Gpu::writeCombMode(uint32_t mask, uint32_t value) {
    // Write to one of the texture combiner mode registers