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Fix incorrect handling of flipped video when the texture size is larger than the video size.

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Originally committed to SVN as r3742.
This commit is contained in:
Thomas Goyne 2009-10-27 20:59:27 +00:00
parent dcfdb02e6c
commit 15cf221a3f
2 changed files with 13 additions and 11 deletions
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22
aegisub/src/video_out_gl.cpp
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@ -107,6 +107,7 @@ VideoOutGL::VideoOutGL()
frameWidth(0),
frameHeight(0),
frameFormat(0),
frameFlipped(false),
textureIdList(),
textureList(),
textureCount(0),
@ -153,7 +154,7 @@ void VideoOutGL::DetectOpenGLCapabilities() {
/// @param bpp The frame's bytes per pixel
void VideoOutGL::InitTextures(int width, int height, GLenum format, int bpp, bool flipped) {
// Do nothing if the frame size and format are unchanged
if (width == frameWidth && height == frameHeight && format == frameFormat) return;
if (width == frameWidth && height == frameHeight && format == frameFormat && flipped == frameFlipped) return;
wxLogDebug("VideoOutGL::InitTextures: Video size: %dx%d\n", width, height);
DetectOpenGLCapabilities();
@ -218,22 +219,21 @@ void VideoOutGL::InitTextures(int width, int height, GLenum format, int bpp, boo
ti.texTop = 1.0f / (2 * h);
}
ti.texRight = 1.0f - ti.texLeft;
ti.texBottom = 1.0f - ti.texTop;
if (flipped) {
float t = ti.texTop;
ti.texTop = ti.texBottom;
ti.texBottom = ti.texTop;
}
// destW/H is the percent of the output which this texture covers
ti.destW = float(w) / width;
ti.destH = float(h) / height;
ti.textureID = textureIdList[i * textureCols + j];
ti.dataOffset = sourceY * width * bpp + sourceX * bpp;
ti.texRight = 1.0f - ti.texLeft;
ti.texBottom = 1.0f - ti.texTop;
if (flipped) {
ti.texBottom = ti.texTop - float(h - ti.sourceH) / h;
ti.texTop = 1.0f - ti.texTop - float(h - ti.sourceH) / h;
ti.dataOffset = (height - sourceY - ti.sourceH) * width * bpp + sourceX * bpp;
}
// Actually create the texture and set the scaling mode
glBindTexture(GL_TEXTURE_2D, ti.textureID);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glBindTexture", err);

2
aegisub/src/video_out_gl.h
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@ -64,6 +64,8 @@ private:
int frameHeight;
/// The frame format which the texture grid has been set up for
GLenum frameFormat;
/// Whether the grid is set up for flipped video
bool frameFlipped;
/// List of OpenGL texture ids used in the grid
std::vector<GLuint> textureIdList;
/// List of precalculated texture display information