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 "narrow.hh"
#include "ranges.hh"
#include "vla.hh"
#include <array>
#include <cstring>
#include <utility>
 
namespace openmsx {
 
GLHQScaler::GLHQScaler(GLScaler& fallback_)
        : GLScaler("hq")
        , fallback(fallback_)
{
        for (auto& p : program) {
                p.activate();
                glUniform1i(p.getUniformLocation("edgeTex"),   2);
                glUniform1i(p.getUniformLocation("offsetTex"), 3);
                glUniform1i(p.getUniformLocation("weightTex"), 4);
        }
 
        // 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
                     320,              // width
                     240,              // height
                     0,                // border
                     format,           // format
                     GL_UNSIGNED_BYTE, // type
                     nullptr);         // data
#if OPENGL_VERSION >= OPENGL_3_3
        GLint swizzleMask[] = {GL_RED, GL_RED, GL_RED, GL_ONE};
        glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
#endif
        edgeBuffer.setImage(320, 240);
 
        const auto& context = systemFileContext();
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        std::string offsetsName = "shaders/HQ_xOffsets.dat";
        std::string weightsName = "shaders/HQ_xWeights.dat";
        for (auto i : xrange(3)) {
                int n = i + 2;
                offsetsName[10] = narrow<char>('0' + n);
                File offsetsFile(context.resolve(offsetsName));
                offsetTexture[i].bind();
                glTexImage2D(GL_TEXTURE_2D,       // target
                             0,                   // level
                             GL_RGBA,             // internal format
                             n * 64,              // width
                             n * 64,              // height
                             0,                   // border
                             GL_RGBA,             // format
                             GL_UNSIGNED_BYTE,    // type
                             offsetsFile.mmap().data());// data
 
                weightsName[10] = narrow<char>('0' + n);
                File weightsFile(context.resolve(weightsName));
                weightTexture[i].bind();
                glTexImage2D(GL_TEXTURE_2D,       // target
                             0,                   // level
                             GL_RGB,              // internal format
                             n * 64,              // width
                             n * 64,              // height
                             0,                   // border
                             GL_RGB,              // format
                             GL_UNSIGNED_BYTE,    // type
                             weightsFile.mmap().data());// 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) || (srcEndY > 240)) return;
 
        std::array<Endian::L32, 320 / 2> tmpBuf2; // 2 x uint16_t
        #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);
        EdgeHQ edgeOp(0, 8, 16);
        calcEdgesGL(curr, next, tmpBuf2, edgeOp);
 
        edgeBuffer.bind();
        if (auto* mapped = edgeBuffer.mapWrite()) {
                for (auto y : xrange(srcStartY, srcEndY)) {
                        curr = next;
                        std::swap(buf1, buf2);
                        next = paintFrame.getLine(narrow<int>(y + 1), buf2);
                        calcEdgesGL(curr, next, tmpBuf2, edgeOp);
                        memcpy(mapped + 320 * size_t(y), tmpBuf2.data(), 320 * sizeof(uint16_t));
                }
                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>(srcEndY - srcStartY), // height
                                format,                             // format
                                GL_UNSIGNED_BYTE,                   // type
                                edgeBuffer.getOffset(0, srcStartY));// data
        }
        edgeBuffer.unbind();
}
 
} // namespace openmsx