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mpv/libvo/gl_common.c

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#include "gl_common.h"
/**
* \brief adjusts the GL_UNPACK_ALGNMENT to fit the stride.
* \param stride number of bytes per line for which alignment should fit.
*/
void glAdjustAlignment(int stride) {
GLint gl_alignment;
if (stride % 8 == 0)
gl_alignment=8;
else if (stride % 4 == 0)
gl_alignment=4;
else if (stride % 2 == 0)
gl_alignment=2;
else
gl_alignment=1;
glPixelStorei (GL_UNPACK_ALIGNMENT, gl_alignment);
}
#include "img_format.h"
struct gl_name_map_struct {
GLint value;
char *name;
};
#undef MAP
#define MAP(a) {a, #a}
static const struct gl_name_map_struct gl_name_map[] = {
// internal format
MAP(GL_R3_G3_B2), MAP(GL_RGB4), MAP(GL_RGB5), MAP(GL_RGB8),
MAP(GL_RGB10), MAP(GL_RGB12), MAP(GL_RGB16), MAP(GL_RGBA2),
MAP(GL_RGBA4), MAP(GL_RGB5_A1), MAP(GL_RGBA8), MAP(GL_RGB10_A2),
MAP(GL_RGBA12), MAP(GL_RGBA16), MAP(GL_LUMINANCE8),
// format
MAP(GL_RGB), MAP(GL_RGBA), MAP(GL_RED), MAP(GL_GREEN), MAP(GL_BLUE),
MAP(GL_ALPHA), MAP(GL_LUMINANCE), MAP(GL_LUMINANCE_ALPHA),
MAP(GL_COLOR_INDEX),
// rest 1.2 only
#ifdef GL_VERSION_1_2
MAP(GL_BGR), MAP(GL_BGRA),
#endif
//type
MAP(GL_BYTE), MAP(GL_UNSIGNED_BYTE), MAP(GL_SHORT), MAP(GL_UNSIGNED_SHORT),
MAP(GL_INT), MAP(GL_UNSIGNED_INT), MAP(GL_FLOAT), MAP(GL_DOUBLE),
MAP(GL_2_BYTES), MAP(GL_3_BYTES), MAP(GL_4_BYTES),
// rest 1.2 only
#ifdef GL_VERSION_1_2
MAP(GL_UNSIGNED_BYTE_3_3_2), MAP(GL_UNSIGNED_BYTE_2_3_3_REV),
MAP(GL_UNSIGNED_SHORT_5_6_5), MAP(GL_UNSIGNED_SHORT_5_6_5_REV),
MAP(GL_UNSIGNED_SHORT_4_4_4_4), MAP(GL_UNSIGNED_SHORT_4_4_4_4_REV),
MAP(GL_UNSIGNED_SHORT_5_5_5_1), MAP(GL_UNSIGNED_SHORT_1_5_5_5_REV),
MAP(GL_UNSIGNED_INT_8_8_8_8), MAP(GL_UNSIGNED_INT_8_8_8_8_REV),
MAP(GL_UNSIGNED_INT_10_10_10_2), MAP(GL_UNSIGNED_INT_2_10_10_10_REV),
#endif
{0, 0}
};
#undef MAP
/**
* \brief return the name of an OpenGL constant
* \param value the constant
* \return name of the constant or "Unknown format!"
*/
const char *glValName(GLint value)
{
int i = 0;
while (gl_name_map[i].name) {
if (gl_name_map[i].value == value)
return gl_name_map[i].name;
i++;
}
return "Unknown format!";
}
#undef TEXTUREFORMAT_ALWAYS
//! always return this format as internal texture format in glFindFormat
#define TEXTUREFORMAT_ALWAYS GL_RGB8
/**
* \brief find the OpenGL settings coresponding to format.
*
* All parameters may be NULL.
* \param fmt MPlayer format to analyze.
* \param bpp [OUT] bits per pixel of that format.
* \param gl_texfmt [OUT] internal texture format that fits the
* image format, not necessarily the best for performance.
* \param gl_format [OUT] OpenGL format for this image format.
* \param gl_type [OUT] OpenGL type for this image format.
* \return 1 if format is supported by OpenGL, 0 if not.
*/
int glFindFormat(uint32_t fmt, uint32_t *bpp, GLenum *gl_texfmt,
GLenum *gl_format, GLenum *gl_type)
{
int dummy1;
GLenum dummy2;
if (bpp == NULL) bpp = &dummy1;
if (gl_texfmt == NULL) gl_texfmt = &dummy2;
if (gl_format == NULL) gl_format = &dummy2;
if (gl_type == NULL) gl_type = &dummy2;
*bpp = IMGFMT_IS_BGR(fmt)?IMGFMT_BGR_DEPTH(fmt):IMGFMT_RGB_DEPTH(fmt);
*gl_texfmt = 3;
switch (fmt) {
case IMGFMT_RGB24:
*gl_format = GL_RGB;
*gl_type = GL_UNSIGNED_BYTE;
break;
case IMGFMT_RGBA:
*gl_texfmt = 4;
*gl_format = GL_RGBA;
*gl_type = GL_UNSIGNED_BYTE;
break;
case IMGFMT_Y800:
case IMGFMT_Y8:
*gl_texfmt = 1;
*bpp = 8;
*gl_format = GL_LUMINANCE;
*gl_type = GL_UNSIGNED_BYTE;
break;
#ifdef GL_VERSION_1_2
#if 0
// we do not support palettized formats, although the format the
// swscale produces works
case IMGFMT_RGB8:
gl_format = GL_RGB;
gl_type = GL_UNSIGNED_BYTE_2_3_3_REV;
break;
#endif
case IMGFMT_RGB15:
*gl_format = GL_RGBA;
*gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
break;
case IMGFMT_RGB16:
*gl_format = GL_RGB;
*gl_type = GL_UNSIGNED_SHORT_5_6_5_REV;
break;
#if 0
case IMGFMT_BGR8:
// special case as red and blue have a differen number of bits.
// GL_BGR and GL_UNSIGNED_BYTE_3_3_2 isn't supported at least
// by nVidia drivers, and in addition would give more bits to
// blue than to red, which isn't wanted
gl_format = GL_RGB;
gl_type = GL_UNSIGNED_BYTE_3_3_2;
break;
#endif
case IMGFMT_BGR15:
*gl_format = GL_BGRA;
*gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
break;
case IMGFMT_BGR16:
*gl_format = GL_RGB;
*gl_type = GL_UNSIGNED_SHORT_5_6_5;
break;
case IMGFMT_BGR24:
*gl_format = GL_BGR;
*gl_type = GL_UNSIGNED_BYTE;
break;
case IMGFMT_BGRA:
*gl_texfmt = 4;
*gl_format = GL_BGRA;
*gl_type = GL_UNSIGNED_BYTE;
break;
#endif
default:
*gl_texfmt = 4;
*gl_format = GL_RGBA;
*gl_type = GL_UNSIGNED_BYTE;
return 0;
}
#ifdef TEXTUREFORMAT_ALWAYS
*gl_texfmt = TEXTUREFORMAT_ALWAYS;
#endif
return 1;
}
#ifndef GL_WIN32
/**
* Returns the XVisualInfo associated with Window win.
* \param win Window whose XVisualInfo is returne.
* \return XVisualInfo of the window. Caller must use XFree to free it.
*/
static XVisualInfo *getWindowVisualInfo(Window win) {
XWindowAttributes xw_attr;
XVisualInfo vinfo_template;
int tmp;
XGetWindowAttributes(mDisplay, win, &xw_attr);
vinfo_template.visualid = XVisualIDFromVisual(xw_attr.visual);
return XGetVisualInfo(mDisplay, VisualIDMask, &vinfo_template, &tmp);
}
/**
* \brief Changes the window in which video is displayed.
* If possible only transfers the context to the new window, otherwise
* creates a new one, which must be initialized by the caller.
* \param vinfo Currently used visual.
* \param context Currently used context.
* \param win window that should be used for drawing.
* \return one of SET_WINDOW_FAILED, SET_WINDOW_OK or SET_WINDOW_REINIT.
* In case of SET_WINDOW_REINIT the context could not be transfered
* and the caller must initialize it correctly.
*/
int setGlWindow(XVisualInfo **vinfo, GLXContext *context, Window win)
{
XVisualInfo *new_vinfo;
GLXContext new_context = NULL;
int keep_context = 0;
// should only be needed when keeping context, but not doing glFinish
// can cause flickering even when we do not keep it.
glFinish();
new_vinfo = getWindowVisualInfo(win);
if (*context && *vinfo && new_vinfo &&
(*vinfo)->visualid == new_vinfo->visualid) {
// we can keep the GLXContext
new_context = *context;
XFree(new_vinfo);
new_vinfo = *vinfo;
keep_context = 1;
} else {
// create a context
new_context = glXCreateContext(mDisplay, new_vinfo, NULL, True);
if (!new_context) {
mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create GLX context!\n");
XFree(new_vinfo);
return SET_WINDOW_FAILED;
}
}
// set context
if (!glXMakeCurrent(mDisplay, vo_window, new_context)) {
mp_msg (MSGT_VO, MSGL_FATAL, "[gl] Could not set GLX context!\n");
if (!keep_context) {
glXDestroyContext (mDisplay, new_context);
XFree(new_vinfo);
}
return SET_WINDOW_FAILED;
}
// set new values
vo_window = win;
{
Window root;
int tmp;
XGetGeometry(mDisplay, vo_window, &root, &tmp, &tmp,
&vo_dwidth, &vo_dheight, &tmp, &tmp);
}
if (!keep_context) {
if (*context)
glXDestroyContext(mDisplay, *context);
*context = new_context;
if (*vinfo)
XFree(*vinfo);
*vinfo = new_vinfo;
// and inform that reinit is neccessary
return SET_WINDOW_REINIT;
}
return SET_WINDOW_OK;
}
/**
* \brief free the VisualInfo and GLXContext of an OpenGL context.
*/
void releaseGlContext(XVisualInfo **vinfo, GLXContext *context) {
if (*vinfo)
XFree(*vinfo);
*vinfo = NULL;
if (*context)
{
glFinish();
glXMakeCurrent(mDisplay, None, NULL);
glXDestroyContext(mDisplay, *context);
}
*context = 0;
}
#endif
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