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add prefer-texture-buffer

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This commit is contained in:
David Rose 2005-03-01 22:34:08 +00:00
parent 63821e0499
commit 502ae6d15e
3 changed files with 25 additions and 6 deletions
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24
panda/src/display/config_display.cxx
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@ -87,13 +87,27 @@ ConfigVariableBool show_buffers
"GraphicsWindows, if possible, so that their contents may be viewed "
"interactively. Handy during development of multipass algorithms."));
ConfigVariableBool prefer_texture_buffer
("prefer-texture-buffer", true,
PRC_DESC("Set this true to make GraphicsOutput::make_texture_buffer() always "
"try to create an offscreen buffer supporting render-to-texture, "
"if the graphics card claims to be able to support this feature. "
"If the graphics card cannot support this feature, this option is "
"ignored. This is usually the fastest way to render "
"to a texture, and it presumably does not consume any additional "
"framebuffer memory over a copy-to-texture operation (since "
"the texture and the buffer share the "
"same memory)."));
ConfigVariableBool prefer_parasite_buffer
("prefer-parasite-buffer", true,
PRC_DESC("Set this true to make GraphicsOutput::make_texture_buffer() try to "
"create a parasite buffer before it tries to create an offscreen "
"buffer. This may be desired if you know your graphics API does not "
"support render-to-texture and you want to minimize "
"framebuffer memory."));
"create a ParasiteBuffer before it tries to create an offscreen "
"buffer (assuming it could not create a direct render buffer for "
"some reason). This may reduce your graphics card memory "
"requirements by sharing memory with the framebuffer, but it can "
"cause problems if the user subsequently resizes the window "
"smaller than the buffer."));
ConfigVariableBool prefer_single_buffer
("prefer-single-buffer", true,
@ -101,7 +115,7 @@ ConfigVariableBool prefer_single_buffer
"try to create a single-buffered offscreen buffer, before falling "
"back to a double-buffered one (or whatever kind the source window "
"has). This is true by default to reduce waste of framebuffer "
"memory, but you may get a performance benefit by setting it to "
"memory, but you might get a performance benefit by setting it to "
"false (since in that case the buffer can share a graphics context "
"with the window)."));

1
panda/src/display/config_display.h
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@ -48,6 +48,7 @@ extern EXPCL_PANDA ConfigVariableString screenshot_extension;
extern EXPCL_PANDA ConfigVariableBool show_buffers;
extern EXPCL_PANDA ConfigVariableBool prefer_texture_buffer;
extern EXPCL_PANDA ConfigVariableBool prefer_parasite_buffer;
extern EXPCL_PANDA ConfigVariableBool prefer_single_buffer;

6
panda/src/display/graphicsOutput.cxx
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@ -448,8 +448,12 @@ make_texture_buffer(const string &name, int x_size, int y_size) {
// If the user so indicated in the Config.prc file, try to create a
// parasite buffer first. We can only do this if the requested size
// fits within the available framebuffer size.
// fits within the available framebuffer size. Also, don't do this
// if the GSG supports render-to-a-texture and prefer_texture_buffer
// is true, since using a ParasiteButter precludes
// render-to-a-texture.
if (prefer_parasite_buffer &&
!(prefer_texture_buffer && gsg->get_supports_render_texture()) &&
(x_size <= host->get_x_size() && y_size <= host->get_y_size())) {
buffer = engine->make_parasite(host, name, sort, x_size, y_size);
if (buffer != (GraphicsOutput *)NULL) {