GLHQScaler.cc

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#include "GLHQScaler.hh"
#include "GLUtil.hh"
#include "HQCommon.hh"
#include "FrameSource.hh"
#include "FileContext.hh"
#include "File.hh"
#include "StringOp.hh"
#include "vla.hh"
#include <cstring>
#include <algorithm>

using std::string;

namespace openmsx {

GLHQScaler::GLHQScaler(GLScaler& fallback_)
        : GLScaler("hq")
        , fallback(fallback_)
{
        for (int i = 0; i < 2; ++i) {
                program[i].activate();
                glUniform1i(program[i].getUniformLocation("edgeTex"),   2);
                glUniform1i(program[i].getUniformLocation("offsetTex"), 3);
                glUniform1i(program[i].getUniformLocation("weightTex"), 4);
        }

        edgeTexture.bind();
        glTexImage2D(GL_TEXTURE_2D,    // target
                     0,                // level
                     GL_LUMINANCE16,   // internal format
                     320,              // width
                     240,              // height
                     0,                // border
                     GL_LUMINANCE,     // format
                     GL_UNSIGNED_SHORT,// type
                     nullptr);         // data
        edgeBuffer.setImage(320, 240);

        auto context = systemFileContext();
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        for (int i = 0; i < 3; ++i) {
                int n = i + 2;
                string offsetsName = StringOp::Builder() <<
                        "shaders/HQ" << n << "xOffsets.dat";
                File offsetsFile(context.resolve(offsetsName));
                offsetTexture[i].bind();
                size_t size; // dummy
                glTexImage2D(GL_TEXTURE_2D,       // target
                             0,                   // level
                             GL_RGBA8,            // internal format
                             n * 64,              // width
                             n * 64,              // height
                             0,                   // border
                             GL_RGBA,             // format
                             GL_UNSIGNED_BYTE,    // type
                             offsetsFile.mmap(size));// data

                string weightsName = StringOp::Builder() <<
                        "shaders/HQ" << n << "xWeights.dat";
                File weightsFile(context.resolve(weightsName));
                weightTexture[i].bind();
                glTexImage2D(GL_TEXTURE_2D,       // target
                             0,                   // level
                             GL_RGB8,             // internal format
                             n * 64,              // width
                             n * 64,              // height
                             0,                   // border
                             GL_RGB,              // format
                             GL_UNSIGNED_BYTE,    // type
                             weightsFile.mmap(size));// data
        }
        glPixelStorei(GL_UNPACK_ALIGNMENT, 4); // restore to default
}

void GLHQScaler::scaleImage(
        gl::ColorTexture& src, gl::ColorTexture* superImpose,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
        unsigned logSrcHeight)
{
        unsigned factorX = dstWidth / srcWidth; // 1 - 4
        unsigned factorY = (dstEndY - dstStartY) / (srcEndY - srcStartY);

        if ((srcWidth == 320) && (factorX > 1) && (factorX == factorY)) {
                assert(src.getHeight() == 2 * 240);
                setup(superImpose != nullptr);
                glActiveTexture(GL_TEXTURE4);
                weightTexture[factorX - 2].bind();
                glActiveTexture(GL_TEXTURE3);
                offsetTexture[factorX - 2].bind();
                glActiveTexture(GL_TEXTURE2);
                edgeTexture.bind();
                glActiveTexture(GL_TEXTURE0);
                execute(src, superImpose,
                        srcStartY, srcEndY, srcWidth,
                        dstStartY, dstEndY, dstWidth,
                        logSrcHeight);
        } else {
                fallback.scaleImage(src, superImpose,
                                    srcStartY, srcEndY, srcWidth,
                                    dstStartY, dstEndY, dstWidth,
                                    logSrcHeight);
        }
}

using Pixel = uint32_t;
void GLHQScaler::uploadBlock(
        unsigned srcStartY, unsigned srcEndY, unsigned lineWidth,
        FrameSource& paintFrame)
{
        if (lineWidth != 320) return;

        uint32_t tmpBuf2[320 / 2]; // 2 x uint16_t
        #ifndef NDEBUG
        // Avoid UMR. In optimized mode we don't care.
        memset(tmpBuf2, 0, sizeof(tmpBuf2));
        #endif

        VLA_SSE_ALIGNED(Pixel, buf1_, lineWidth); auto* buf1 = buf1_;
        VLA_SSE_ALIGNED(Pixel, buf2_, lineWidth); auto* buf2 = buf2_;
        auto* curr = paintFrame.getLinePtr(srcStartY - 1, lineWidth, buf1);
        auto* next = paintFrame.getLinePtr(srcStartY + 0, lineWidth, buf2);
        EdgeHQ edgeOp(0, 8, 16);
        calcEdgesGL(curr, next, tmpBuf2, edgeOp);

        edgeBuffer.bind();
        if (auto* mapped = edgeBuffer.mapWrite()) {
                for (unsigned y = srcStartY; y < srcEndY; ++y) {
                        curr = next;
                        std::swap(buf1, buf2);
                        next = paintFrame.getLinePtr(y + 1, lineWidth, buf2);
                        calcEdgesGL(curr, next, tmpBuf2, edgeOp);
                        memcpy(mapped + 320 * y, tmpBuf2, 320 * sizeof(uint16_t));
                }
                edgeBuffer.unmap();

                edgeTexture.bind();
                glTexSubImage2D(GL_TEXTURE_2D,       // target
                                0,                   // level
                                0,                   // offset x
                                srcStartY,           // offset y
                                lineWidth,           // width
                                srcEndY - srcStartY, // height
                                GL_LUMINANCE,        // format
                                GL_UNSIGNED_SHORT,   // type
                                edgeBuffer.getOffset(0, srcStartY)); // data
        }
        edgeBuffer.unbind();
}

} // namespace openmsx