openMSX
GLTVScaler.cc
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1 #include "GLTVScaler.hh"
2 #include "RenderSettings.hh"
3 
4 namespace openmsx {
5 
7  : GLScaler("tv")
8  , renderSettings(renderSettings_)
9 {
10  for (auto i : xrange(2)) {
11  program[i].activate();
12  unifMinScanline[i] =
13  program[i].getUniformLocation("minScanline");
14  unifSizeVariance[i] =
15  program[i].getUniformLocation("sizeVariance");
16  }
17 }
18 
20  gl::ColorTexture& src, gl::ColorTexture* superImpose,
21  unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
22  unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
23  unsigned logSrcHeight)
24 {
25  setup(superImpose != nullptr);
26  int i = superImpose ? 1 : 0;
27  // These are experimentally established functions that look good.
28  // By design, both are 0 for scanline 0.
29  float gap = renderSettings.getScanlineGap();
30  glUniform1f(unifMinScanline [i], 0.1f * gap + 0.2f * gap * gap);
31  glUniform1f(unifSizeVariance[i], 0.7f * gap - 0.3f * gap * gap);
32  execute(src, superImpose,
33  srcStartY, srcEndY, srcWidth,
34  dstStartY, dstEndY, dstWidth,
35  logSrcHeight, true);
36 }
37 
38 } // namespace openmsx
void activate() const
Makes this program the active shader program.
Definition: GLUtil.cc:267
GLint getUniformLocation(const char *name) const
Gets a reference to a uniform variable declared in the shader source.
Definition: GLUtil.cc:259
Abstract base class for OpenGL scalers.
Definition: GLScaler.hh:14
void setup(bool superImpose)
Definition: GLScaler.cc:40
void execute(gl::ColorTexture &src, gl::ColorTexture *superImpose, unsigned srcStartY, unsigned srcEndY, unsigned srcWidth, unsigned dstStartY, unsigned dstEndY, unsigned dstWidth, unsigned logSrcHeight, bool textureFromZero=false)
Helper method to draw a rectangle with multiple texture coordinates.
Definition: GLScaler.cc:46
gl::ShaderProgram program[2]
Definition: GLScaler.hh:78
void scaleImage(gl::ColorTexture &src, gl::ColorTexture *superImpose, unsigned srcStartY, unsigned srcEndY, unsigned srcWidth, unsigned dstStartY, unsigned dstEndY, unsigned dstWidth, unsigned logSrcHeight) override
Scales the image in the given area, which must consist of lines which are all equally wide.
Definition: GLTVScaler.cc:19
GLTVScaler(RenderSettings &renderSettings)
Definition: GLTVScaler.cc:6
Class containing all settings for renderers.
float getScanlineGap() const
The amount of space [0..1] between scanlines.
This file implemented 3 utility functions:
Definition: Autofire.cc:5
constexpr auto xrange(T e)
Definition: xrange.hh:155