GLSaIScaler.cc

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#include "GLSaIScaler.hh"
#include "memory.hh"

using std::string;

namespace openmsx {

GLSaIScaler::GLSaIScaler()
{
        for (int i = 0; i < 2; ++i) {
                string header = string("#define SUPERIMPOSE ")
                              + char('0' + i) + '\n';
                VertexShader   vertexShader  (header, "sai.vert");
                FragmentShader fragmentShader(header, "sai.frag");
                scalerProgram[i].attach(vertexShader);
                scalerProgram[i].attach(fragmentShader);
                scalerProgram[i].link();
#ifdef GL_VERSION_2_0
                if (GLEW_VERSION_2_0) {
                        scalerProgram[i].activate();
                        glUniform1i(scalerProgram[i].getUniformLocation("tex"), 0);
                        if (i == 1) {
                                glUniform1i(scalerProgram[i].getUniformLocation("videoTex"), 1);
                        }
                        texSizeLoc[i] = scalerProgram[i].getUniformLocation("texSize");
                }
#endif
        }
}

void GLSaIScaler::scaleImage(
        ColorTexture& src, ColorTexture* superImpose,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
        unsigned logSrcHeight)
{
        int i = superImpose ? 1 : 0;
        if (superImpose) {
                glActiveTexture(GL_TEXTURE1);
                superImpose->bind();
                glActiveTexture(GL_TEXTURE0);
        }
        scalerProgram[i].activate();
        if (GLEW_VERSION_2_0) {
                glUniform2f(texSizeLoc[i], srcWidth, src.getHeight());
        }
        drawMultiTex(src, srcStartY, srcEndY, src.getHeight(), logSrcHeight,
                     dstStartY, dstEndY, dstWidth);
}

} // namespace openmsx