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gl region of interest support

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wang-bin
2013-10-15 01:08:40 +08:00
parent 5d18b583cb
commit 5eeaa98faf
1 changed files with 34 additions and 8 deletions
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src/GLWidgetRenderer.cpp
+34 -8
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@@ -35,6 +35,7 @@
#include <GL/glext.h> //GL_BGRA_EXT for OpenGL<=1.1 //TODO Apple include <OpenGL/xxx>
#endif
#endif //GL_BGRA_EXT
//TODO: glPixelStorei(GL_PACK_SWAP_BYTES, ) to swap rgba?
#ifndef GL_BGRA //it may be defined in glext.h
#define GL_BGRA GL_BGRA_EXT
#define GL_BGR GL_BGR_EXT
@@ -214,14 +215,39 @@ void GLWidgetRenderer::drawFrame()
#endif //QT_OPENGL_ES_2
glBindTexture(GL_TEXTURE_2D, d.texture);
d.setupQuality();
glTexImage2D(GL_TEXTURE_2D
, 0 //level
, FMT_INTERNAL //internal format. 4? why GL_RGBA? GL_RGB?
, d.src_width, d.src_height
, 0 //border, ES not support
, FMT //format, must the same as internal format?
, GL_UNSIGNED_BYTE
, d.data.constData());
QRect roi = realROI();
if (roi.size() == QSize(d.src_width, d.src_height)) {
glTexImage2D(GL_TEXTURE_2D
, 0 //level
, FMT_INTERNAL //internal format. 4? why GL_RGBA? GL_RGB?
, d.src_width, d.src_height
, 0 //border, ES not support
, FMT //format, must the same as internal format?
, GL_UNSIGNED_BYTE
, d.data.constData());
} else {
#ifdef GL_UNPACK_ROW_LENGTH
// http://stackoverflow.com/questions/205522/opengl-subtexturing
glPixelStorei(GL_UNPACK_ROW_LENGTH, d.src_width);
//glPixelStorei or compute pointer
glPixelStorei(GL_UNPACK_SKIP_PIXELS, roi.x());
glPixelStorei(GL_UNPACK_SKIP_ROWS, roi.y());
glTexImage2D(GL_TEXTURE_2D, 0, FMT_INTERNAL, roi.width(), roi.height(), 0, FMT, GL_UNSIGNED_BYTE, d.data.constData());
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
#else // GL ES
//define it? or any efficient way?
glTexImage2D(GL_TEXTURE_2D, 0, FMT_INTERNAL, roi.width(), roi.height(), 0, FMT, GL_UNSIGNED_BYTE, NULL);
// how to use only 1 call?
//glTexSubImage2D(GL_TEXTURE_2D, 0, roi.x(), roi.y(), roi.width(), roi.height(), FMT, GL_UNSIGNED_BYTE, d.data.constData());
for(int y = 0; y < roi.height(); y++) {
char *row = d.data.data() + ((y + roi.y())*d.src_width + roi.x()) * 4;
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, y, roi.width(), 1, FMT, GL_UNSIGNED_BYTE, row);
}
#endif //GL_UNPACK_ROW_LENGTH
}
#ifndef QT_OPENGL_ES_2
//qpainter will reset gl state, so need glMatrixMode and clear color(in drawBackground())
//TODO: study what state will be reset