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Make the video display only upload texture data when the frame has changed rather than every time Render is called.

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Originally committed to SVN as r3726.
This commit is contained in:
Thomas Goyne 2009-10-20 19:07:18 +00:00
parent c72ac65d0f
commit df5ada1006
3 changed files with 22 additions and 9 deletions
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3
aegisub/src/video_display.cpp
View file

@ -193,6 +193,7 @@ void VideoDisplay::SetFrame(int frameNumber) {
if (IsShownOnScreen() && visual) visual->Refresh();
// Render the new frame
videoOut->InvalidateFrame();
Render(frameNumber);
currentFrame = frameNumber;
@ -274,7 +275,7 @@ void VideoDisplay::Render(int frameNumber) try {
glDisable(GL_BLEND);
if (glGetError()) throw _T("Error disabling blending.");
videoOut->DisplayFrame(context->GetFrame(frameNumber), sw, sh);
videoOut->DisplayFrame(context->GetFrame(frameNumber), frameNumber, sw, sh);
DrawTVEffects();

16
aegisub/src/video_out_gl.cpp
View file

@ -111,7 +111,8 @@ VideoOutGL::VideoOutGL()
textureList(),
textureCount(0),
textureRows(0),
textureCols(0)
textureCols(0),
lastFrame(-1)
{ }
/// @brief Runtime detection of required OpenGL capabilities
@ -218,9 +219,8 @@ void VideoOutGL::InitTextures(int width, int height, GLenum format, int bpp) {
ti.texTop = 1.0f / (2 * h);
}
// Calculate what percent of the texture is actually used
ti.texRight = float(ti.sourceW) / w - ti.texLeft;
ti.texBottom = float(ti.sourceH) / h - ti.texTop;
ti.texRight = 1.0f - ti.texLeft;
ti.texBottom = 1.0f - ti.texTop;
// destW/H is the percent of the output which this texture covers
ti.destW = float(w) / width;
@ -259,9 +259,11 @@ void VideoOutGL::InitTextures(int width, int height, GLenum format, int bpp) {
frameFormat = format;
}
void VideoOutGL::DisplayFrame(AegiVideoFrame frame, int sw, int sh) {
void VideoOutGL::DisplayFrame(AegiVideoFrame frame, int frameNumber, int sw, int sh) {
if (frame.h == 0 || frame.w == 0) return;
if (frameNumber == -1) frameNumber = lastFrame;
glEnable(GL_TEXTURE_2D);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glEnable(GL_TEXTURE_2d)", err);
@ -283,8 +285,10 @@ void VideoOutGL::DisplayFrame(AegiVideoFrame frame, int sw, int sh) {
glBindTexture(GL_TEXTURE_2D, ti.textureID);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glBindTexture", err);
if (lastFrame != frameNumber) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, ti.sourceW, ti.sourceH, format, GL_UNSIGNED_BYTE, frame.data[0] + ti.dataOffset);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexSubImage2D", err);
}
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glColor4f", err);
@ -313,6 +317,8 @@ void VideoOutGL::DisplayFrame(AegiVideoFrame frame, int sw, int sh) {
glDisable(GL_TEXTURE_2D);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glDisable(GL_TEXTURE_2d)", err);
lastFrame = frameNumber;
}
VideoOutGL::~VideoOutGL() {

8
aegisub/src/video_out_gl.h
View file

@ -74,6 +74,8 @@ private:
int textureRows;
/// The number of columns of textures
int textureCols;
/// The frame currently displayed
int lastFrame;
void DetectOpenGLCapabilities();
void InitTextures(int width, int height, GLenum format, int bpp);
@ -83,9 +85,13 @@ private:
public:
/// @brief Render a frame
/// @param frame The frame to be displayed
/// @param frameNumber The frame number of the frame to be displayed
/// @param sw The current script width
/// @param sh The current script height
void DisplayFrame(AegiVideoFrame frame, int sw, int sh);
void DisplayFrame(AegiVideoFrame frame, int frameNumber, int sw, int sh);
/// @brief Force the redisplay of the frame the next time DisplayFrame is called even if the frame number has not changed
void InvalidateFrame() { lastFrame = -1; }
/// @brief Constructor
VideoOutGL();