c++ - glTexImage2D take long time in some PCs -


background:

  1. use dxva2 decode 4k 30fps video,then pass decoded frames directly opengl render.
  2. the framework gpu decode(dxva2) gpu render(opengl),without copy cpu.

problem:

  1. i found in pcs glteximage2d take long time(140ms).one pc's gpu intel hd 5500 + nivida gefoce 940m.
  2. but in pcs takes 16ms.one pc's gpu intel hd 5500 + amd r7 m260.
  3. all pcs have latest gpu driver updated.

sourcecode:

below dxva2 decode source code.

static int dxva2_retrieve_data(avcodeccontext *s, avframe *frame) {     lpdirect3dsurface9 surface =  (lpdirect3dsurface9)frame->data[3];     inputstream        *ist = (inputstream *)s->opaque;     dxva2context       *ctx = (dxva2context*)ist->hwaccel_ctx;     d3dsurface_desc    surfacedesc;     d3dlocked_rect     lockedrect;     hresult            hr;     int                ret;      idirect3dsurface9_getdesc(surface, &surfacedesc);      hr = idirect3dsurface9_lockrect(surface, &lockedrect, null, d3dlock_readonly);     if (failed(hr)) {         av_log(null, av_log_error, "unable lock dxva2 surface\n");         return averror_unknown;     }      picture->data[0] = (uint8_t*)lockedrect.pbits;     picture->data[1] = (uint8_t*)lockedrect.pbits + lockedrect.pitch * surfacedesc.height;     framewidth = frame->width;     frameheight = frame->height;     //glfinish() <---- commentee suggestion     dword start = gettickcount();//test time     draw();//opengl draw             //glfinish() <---- commentee suggestion     dword end = gettickcount();//test time     printf("draw time:%d\n", end - start);//test time     start = end - start;     picture->data[0] = nullptr;     picture->data[1] = nullptr;      idirect3dsurface9_unlockrect(surface);     return 0; fail:     return ret; }

below draw function's code.

void draw() {     glclearcolor(1.0f, 1.0f, 1.0f, 1.0f);     glcleardepth(1.0f);     glclear(gl_color_buffer_bit);     glshademodel(gl_smooth);      glclearcolor(0.0, 255, 0.0, 0.0);     glclear(gl_color_buffer_bit);      gluseprogram(g_program);     glactivetexture(gl_texture0);     glbindtexture(gl_texture_2d, g_texture[0]);     glteximage2d(gl_texture_2d, 0, gl_red, framewidth, frameheight, 0, gl_red, gl_unsigned_byte, picture->data[0]);     gluniform1i(y, 0);      glactivetexture(gl_texture1);     glbindtexture(gl_texture_2d, g_texture[1]);     glteximage2d(gl_texture_2d, 0, gl_luminance_alpha, framewidth / 2, frameheight / 2, 0, gl_luminance_alpha, gl_unsigned_byte, picture->data[1]);     gluniform1i(uv, 1);      drawhorizontal();      glbindvertexarray(0);     gluseprogram(0);     glbindtexture(gl_texture_2d, 0); }

question：

who can tell me why same code have different result @ different pcs? or give me advices?


Comments

Post a Comment

Popular posts from this blog

Sort a complex associative array in PHP -

this question has answer here: php sort array subarray value 5 answers i have associative array in php like: $newarray1 = array ( [producta] => array ( [link] => http://sanjosespartan.com/blog/products/agile-java-development/ [visitcount] => 4 ) [productd] => array ( [link] => http://sanjosespartan.com/blog/products/intro-to-go/ [visitcount] => 1 ) [productg] => array ( [link] => http://sanjosespartan.com/blog/products/node-js-for-developers/ [visitcount] => 1 ) [productb] => array ( [link] => http://sanjosespartan.com/blog/products/beginning-mysql/ [visitcount] => 1 ) [productc] => array ( [link] => http://sanjosespartan.com/blog/products/computer-networks/ [visitcount] => 1 ) ...
Read more

vb.net - How to ignore if a cell is empty nothing -

how use roscolor() ignore value (like empty cell) ? color row if value upper 5 when there nothing in cell, want ignore roscolor() apply, how? public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val integer val = quotedatagridview1.rows(i).cells(3).value if val = vbempty quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white elseif val < 5 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.red elseif val > 5 , val < 10 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.lightyellow end if next end sub you can check empty value following public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val = quotedatagridview1.rows(i).cells(3).value if isdbnull(val) or val nothing quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white ...
Read more

recursion - Can every recursive algorithm be improved with dynamic programming? -

i first year undergraduate csc student looking competitive programming. recursion involves defining , solving sub problems. understand, top down dynamic programming (dp) involves memoizing solutions sub problems reduce time complexity of algorithm. can top down dp used improve efficiency of every recursive algorithm overlapping sub problems? dp fail work , how can identify this? the short answer is: yes. however, there constraints. obvious 1 recursive calls must overlap. i.e. during execution of algorithm, recursive function must called multiple times same parameters. lets truncate recursion tree memoization. can use memoization reduce number of calls. however, reduction of calls comes price. need store results somewhere. next obvious constraint need have enough memory. comes not-so obvious constraint. memory access requires time. first need find result stored , maybe copy location. in cases, might faster let recursion calculate result instead of loading somewher...
Read more