GLHQLiteScaler.cc

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#include "GLHQLiteScaler.hh"
 
#include "File.hh"
#include "FileContext.hh"
#include "FrameSource.hh"
#include "GLUtil.hh"
#include "HQCommon.hh"
 
#include "narrow.hh"
#include "ranges.hh"
#include "vla.hh"
 
#include <array>
#include <cstring>
#include <utility>
 
namespace openmsx {
 
GLHQLiteScaler::GLHQLiteScaler(GLScaler& fallback_, unsigned maxWidth_, unsigned maxHeight_)
        : GLScaler("hqlite")
        , fallback(fallback_)
        , maxWidth(maxWidth_), maxHeight(maxHeight_)
{
        for (auto i : xrange(2)) {
                auto& p = program[i];
                p.activate();
                glUniform1i(p.getUniformLocation("edgeTex"),   2);
                glUniform1i(p.getUniformLocation("offsetTex"), 3);
                edgePosScaleUnif[i] = p.getUniformLocation("edgePosScale");
        }
 
        // GL_LUMINANCE_ALPHA is no longer supported in newer openGL versions
        auto format = (OPENGL_VERSION >= OPENGL_3_3) ? GL_RG : GL_LUMINANCE_ALPHA;
        edgeTexture.bind();
        glTexImage2D(GL_TEXTURE_2D,    // target
                     0,                // level
                     format,           // internal format
                     maxWidth,         // width
                     maxHeight,        // height
                     0,                // border
                     format,           // format
                     GL_UNSIGNED_BYTE, // type
                     nullptr);         // data
#if OPENGL_VERSION >= OPENGL_3_3
        GLint swizzleMask1[] = {GL_RED, GL_RED, GL_RED, GL_GREEN};
        glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask1);
#endif
        edgeBuffer.allocate(maxWidth * maxHeight);
 
        const auto& context = systemFileContext();
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        std::string offsetName = "shaders/HQ_xLiteOffsets.dat";
        for (auto i : xrange(3)) {
                int n = i + 2;
                offsetName[10] = narrow<char>('0' + n);
                File offsetFile(context.resolve(offsetName));
                offsetTexture[i].bind();
                glTexImage2D(GL_TEXTURE_2D,        // target
                             0,                    // level
                             format,               // internal format
                             n * 64,               // width
                             n * 64,               // height
                             0,                    // border
                             format,               // format
                             GL_UNSIGNED_BYTE,     // type
                             offsetFile.mmap().data());// data
#if OPENGL_VERSION >= OPENGL_3_3
                GLint swizzleMask2[] = {GL_RED, GL_RED, GL_RED, GL_GREEN};
                glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask2);
#endif
        }
        glPixelStorei(GL_UNPACK_ALIGNMENT, 4); // restore to default
}
 
void GLHQLiteScaler::scaleImage(
        gl::ColorTexture& src, gl::ColorTexture* superImpose,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
        unsigned logSrcHeight)
{
        unsigned factorY = (dstEndY - dstStartY) / (srcEndY - srcStartY); // 1 - 4
 
        if ((factorY >= 2) && ((srcWidth % 320) == 0)) {
                setup(superImpose != nullptr);
                src.setInterpolation(true);
                glActiveTexture(GL_TEXTURE3);
                offsetTexture[factorY - 2].bind();
                glActiveTexture(GL_TEXTURE2);
                edgeTexture.bind();
                glActiveTexture(GL_TEXTURE0);
 
                int i = superImpose ? 1 : 0;
                glUniform2f(edgePosScaleUnif[i], src.getWidth() / float(maxWidth), src.getHeight() / float(maxHeight));
 
                execute(src, superImpose,
                        srcStartY, srcEndY, srcWidth,
                        dstStartY, dstEndY, dstWidth,
                        logSrcHeight);
                src.setInterpolation(false);
        } else {
                fallback.scaleImage(src, superImpose,
                                    srcStartY, srcEndY, srcWidth,
                                    dstStartY, dstEndY, dstWidth,
                                    logSrcHeight);
        }
}
 
using Pixel = uint32_t;
void GLHQLiteScaler::uploadBlock(
        unsigned srcStartY, unsigned srcEndY, unsigned lineWidth,
        FrameSource& paintFrame)
{
        if ((lineWidth % 320) != 0) return;
 
        assert(maxWidth <= 1280);
        std::array<Endian::L32, 1280 / 2> tmpBufMax; // 2 x uint16_t
        auto tmpBuf2 = subspan(tmpBufMax, 0, lineWidth / 2);
        #ifndef NDEBUG
        // Avoid UMR. In optimized mode we don't care.
        ranges::fill(tmpBuf2, 0);
        #endif
 
        VLA_SSE_ALIGNED(Pixel, buf1, lineWidth);
        VLA_SSE_ALIGNED(Pixel, buf2, lineWidth);
        auto curr = paintFrame.getLine(narrow<int>(srcStartY) - 1, buf1);
        auto next = paintFrame.getLine(narrow<int>(srcStartY) + 0, buf2);
        calcEdgesGL(curr, next, tmpBuf2, EdgeHQLite());
 
        edgeBuffer.bind();
        auto mapped = edgeBuffer.mapWrite();
        auto numLines = srcEndY - srcStartY;
        for (auto yy : xrange(numLines)) {
                curr = next;
                std::swap(buf1, buf2);
                next = paintFrame.getLine(narrow<int>(yy + srcStartY + 1), buf2);
                calcEdgesGL(curr, next, tmpBuf2, EdgeHQLite());
                auto dest = mapped.subspan(yy * size_t(lineWidth), lineWidth);
                assert(dest.size_bytes() == tmpBuf2.size_bytes()); // note: convert L32 -> 2 x uint16_t
                memcpy(dest.data(), tmpBuf2.data(), tmpBuf2.size_bytes());
        }
        edgeBuffer.unmap();
 
        auto format = (OPENGL_VERSION >= OPENGL_3_3) ? GL_RG : GL_LUMINANCE_ALPHA;
        edgeTexture.bind();
        glTexSubImage2D(GL_TEXTURE_2D,            // target
                        0,                        // level
                        0,                        // offset x
                        narrow<GLint>(srcStartY), // offset y
                        narrow<GLint>(lineWidth), // width
                        narrow<GLint>(numLines),  // height
                        format,                   // format
                        GL_UNSIGNED_BYTE,         // type
                        mapped.data());           // data
        edgeBuffer.unbind();
}
 
} // namespace openmsx