openMSX
GLSimpleScaler.cc
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1#include "GLSimpleScaler.hh"
2#include "RenderSettings.hh"
3#include "narrow.hh"
4#include "xrange.hh"
5
6namespace openmsx {
7
9 RenderSettings& renderSettings_, GLScaler& fallback_)
10 : GLScaler("simple")
11 , renderSettings(renderSettings_)
12 , fallback(fallback_)
13{
14 for (auto i : xrange(2)) {
15 program[i].activate();
16 unifTexStepX[i] = program[i].getUniformLocation("texStepX");
17 unifCnst[i] = program[i].getUniformLocation("cnst");
18 }
19}
20
22 gl::ColorTexture& src, gl::ColorTexture* superImpose,
23 unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
24 unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
25 unsigned logSrcHeight)
26{
27 int i = superImpose ? 1 : 0;
28
29 GLfloat blur = narrow<float>(renderSettings.getBlurFactor()) * (1.0f / 256.0f);
30 GLfloat scanline = narrow<float>(renderSettings.getScanlineFactor()) * (1.0f / 255.0f);
31 unsigned yScale = (dstEndY - dstStartY) / (srcEndY - srcStartY);
32 if (yScale == 0) {
33 // less lines in destination than in source
34 // (factor=1 / interlace) --> disable scanlines
35 scanline = 1.0f;
36 yScale = 1;
37 }
38
39 if ((blur != 0.0f) || (scanline != 1.0f) || superImpose) {
40 setup(superImpose != nullptr);
41 if ((blur != 0.0f) && (srcWidth != 1)) { // srcWidth check: workaround for ATI cards
42 src.setInterpolation(true);
43 }
44 auto yScaleF = narrow<GLfloat>(yScale);
45 GLfloat scan_a = (yScale & 1) ? 0.5f : ((yScaleF + 1.0f) / (2.0f * yScaleF));
46 GLfloat scan_b = 2.0f - 2.0f * scanline;
47 GLfloat scan_c = scanline;
48 if (!superImpose) {
49 // small optimization in simple.frag:
50 // divide by 2 here instead of on every pixel
51 scan_b *= 0.5f;
52 scan_c *= 0.5f;
53 }
54 auto recipSrcWidth = 1.0f / narrow<float>(srcWidth);
55 glUniform3f(unifTexStepX[i], recipSrcWidth, recipSrcWidth, 0.0f);
56 glUniform4f(unifCnst[i], scan_a, scan_b, scan_c, blur);
57
58 execute(src, superImpose,
59 srcStartY, srcEndY, srcWidth,
60 dstStartY, dstEndY, dstWidth,
61 logSrcHeight);
62
63 src.setInterpolation(false);
64 } else {
65 fallback.scaleImage(src, superImpose, srcStartY, srcEndY, srcWidth,
66 dstStartY, dstEndY, dstWidth, logSrcHeight);
67 }
68}
69
70} // namespace openmsx
void setInterpolation(bool interpolation)
Enable/disable bilinear interpolation for this texture.
Definition GLUtil.cc:62
Abstract base class for OpenGL scalers.
Definition GLScaler.hh:16
void setup(bool superImpose)
Setup scaler.
Definition GLScaler.cc:40
std::array< gl::ShaderProgram, 2 > program
Definition GLScaler.hh:85
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:48
virtual void scaleImage(gl::ColorTexture &src, gl::ColorTexture *superImpose, unsigned srcStartY, unsigned srcEndY, unsigned srcWidth, unsigned dstStartY, unsigned dstEndY, unsigned dstWidth, unsigned logSrcHeight)=0
Scales the image in the given area, which must consist of lines which are all equally wide.
GLSimpleScaler(RenderSettings &renderSettings, GLScaler &fallback)
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.
Class containing all settings for renderers.
This file implemented 3 utility functions:
Definition Autofire.cc:11
constexpr auto xrange(T e)
Definition xrange.hh:132