glPopMatrix() 喊叫“setup_hardware_state 中不支持纹理格式”

我正在尝试对 Linux 的私人视频播放器进行一些优化，旨在提高性能，因为播放 MP4 文件对 CPU 的占用很大，自从视频帧采用 YV12 编码并且 OpenGL 不提供显示此格式的本机方法。现在有一段代码在CPU上运行，在将图像发送到GPU进行显示之前将YV12转换为RGB，这会消耗100%的CPU处理。

我目前正在调查如何在无需编写着色器的情况下解码 YV12 帧进行 YV12 -> RGB 转换。据我了解，做到这一点的一种方法是通过GL_MESA_ycbcr_texture，显然我的系统支持（由glxinfo).

在这个 Fedora Box 中我有一个ATI Technologies Inc RV610 视频设备 [Radeon HD 2400 PRO]，这是一个不错的视频卡。然后，我下载了yuvrect http://www.koders.com/c/fidC89186A9919D76D579AE11B90E597305F51D4941.aspx测试并做了一些更改来替换GL_TEXTURE_RECTANGLE_NV对于该卡支持的纹理：GL_TEXTURE_RECTANGLE_ARB.

但是，当我执行这个修改后的应用程序时，它输出：

The MESA driver reports *unsupported texture format in setup_hardware_state*

我注意到这个错误出现在glPopMatrix();是从执行Display()打回来。现在，这看起来不像是我的应用程序中的错误因为我在另一个具有不同显卡的 Fedora 盒子（同一系统）上运行了完全相同的代码：英特尔公司 Sandy Bridge 集成图形控制器（修订版 09），而且效果很好。

这两个二进制文件之间唯一可见的区别是它们所链接的库。在（有问题的）ATI 卡上ldd报告：

linux-gate.so.1 =>  (0x00da3000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x077bd000)
libGLU.so.1 => /usr/lib/libGLU.so.1 (0x0783b000)
libglut.so.3 => /usr/lib/libglut.so.3 (0x005a9000)
libGLEW.so.1.5 => /usr/lib/libGLEW.so.1.5 (0x00aa3000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x057e2000)
libm.so.6 => /lib/libm.so.6 (0x004e4000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x0053f000)
libc.so.6 => /lib/libc.so.6 (0x00358000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x0071b000)
libXext.so.6 => /usr/lib/libXext.so.6 (0x009c5000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0x00af7000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0x00b76000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0x0014e000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0x00101000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00510000)
libdl.so.2 => /lib/libdl.so.2 (0x0052d000)
libXi.so.6 => /usr/lib/libXi.so.6 (0x00110000)
/lib/ld-linux.so.2 (0x00337000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00859000)
librt.so.1 => /lib/librt.so.1 (0x00534000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x00854000)

同时，在 Intel 卡上，您可以看到它与 libv4l 和其他一些库链接，而 ATI 则没有！我想知道这是否与我面临的问题有关：

linux-gate.so.1 =>  (0x008d6000)
/usr/lib/libv4l/v4l1compat.so (0x00345000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x4fb85000)
libGLU.so.1 => /usr/lib/libGLU.so.1 (0x4fc10000)
libglut.so.3 => /usr/lib/libglut.so.3 (0x005a9000)
libGLEW.so.1.5 => /usr/lib/libGLEW.so.1.5 (0x4fc82000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x42ca7000)
libm.so.6 => /lib/libm.so.6 (0x41fbc000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x42017000)
libc.so.6 => /lib/libc.so.6 (0x41e30000)
libv4l1.so.0 => /usr/lib/libv4l1.so.0 (0x00110000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x421f8000)
libXext.so.6 => /usr/lib/libXext.so.6 (0x424c0000)
libXdamage.so.1 => /usr/lib/libXdamage.so.1 (0x42c0e000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0x42d98000)
libXxf86vm.so.1 => /usr/lib/libXxf86vm.so.1 (0x432a2000)
libdrm.so.2 => /usr/lib/libdrm.so.2 (0x4247b000)
libpthread.so.0 => /lib/libpthread.so.0 (0x41fe8000)
libdl.so.2 => /lib/libdl.so.2 (0x42005000)
libXi.so.6 => /usr/lib/libXi.so.6 (0x42748000)
/lib/ld-linux.so.2 (0x41e0f000)
libv4l2.so.0 => /usr/lib/libv4l2.so.0 (0x4217c000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x42337000)
librt.so.1 => /lib/librt.so.1 (0x4200c000)
libv4lconvert.so.0 => /usr/lib/libv4lconvert.so.0 (0x42357000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x421f3000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x43317000)

如果您想运行下面的示例，您需要readtex.c http://www.koders.com/c/fid2FF2C627A1499FD31506E73071C84B73EEC28686.aspx , readtex.h http://www.koders.com/c/fid0DFE124A7E00BE969B544D28014BBDBB797B3409.aspx and girl.rgb http://www.mediafire.com/?xe0u3cecb34q33q，并用以下命令编译它：g++ yuvrect.cpp -o yuvrect -lGL -lGLU -lglut -lGLEW

#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/glut.h>

#include "readtex.c"   /* I know, this is a hack. */

#define TEXTURE_FILE "girl.rgb"

static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLint ImgWidth, ImgHeight;
static GLushort *ImageYUV = NULL;


static void DrawObject(void)
{
   glBegin(GL_QUADS);

   glTexCoord2f(0, 0);
   glVertex2f(-1.0, -1.0);

   glTexCoord2f(ImgWidth, 0);
   glVertex2f(1.0, -1.0);

   glTexCoord2f(ImgWidth, ImgHeight);
   glVertex2f(1.0, 1.0);

   glTexCoord2f(0, ImgHeight);
   glVertex2f(-1.0, 1.0);

   glEnd();
}


static void Display( void )
{
   glClear( GL_COLOR_BUFFER_BIT );

   glPushMatrix();
      glRotatef(Xrot, 1.0, 0.0, 0.0);
      glRotatef(Yrot, 0.0, 1.0, 0.0);
      glRotatef(Zrot, 0.0, 0.0, 1.0);
      DrawObject();
   glPopMatrix(); // <--- error message comes from this call

   glutSwapBuffers();
}


static void Reshape( int width, int height )
{
   glViewport( 0, 0, width, height );
   glMatrixMode( GL_PROJECTION );
   glLoadIdentity();
   glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
   glMatrixMode( GL_MODELVIEW );
   glLoadIdentity();
   glTranslatef( 0.0, 0.0, -15.0 );
}


static void Key( unsigned char key, int x, int y )
{
   (void) x;
   (void) y;
   switch (key) {
      case 27:
         exit(0);
         break;
   }
   glutPostRedisplay();
}


static void SpecialKey( int key, int x, int y )
{
   float step = 3.0;
   (void) x;
   (void) y;

   switch (key) {
      case GLUT_KEY_UP:
         Xrot += step;
         break;
      case GLUT_KEY_DOWN:
         Xrot -= step;
         break;
      case GLUT_KEY_LEFT:
         Yrot += step;
         break;
      case GLUT_KEY_RIGHT:
         Yrot -= step;
         break;
   }
   glutPostRedisplay();
}        

static void Init( int argc, char *argv[] )
{
   GLuint texObj = 100;
   const char *file;

   printf("Checking GL_ARB_texture_rectangle\n");
   if (!glutExtensionSupported("GL_ARB_texture_rectangle")) {
      printf("Sorry, GL_NV_texture_rectangle is required\n");
      exit(0);
   }

   printf("Checking GL_MESA_ycbcr_texture\n");
   if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
      printf("Sorry, GL_MESA_ycbcr_texture is required\n");
      exit(0);
   }

   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texObj);
#ifdef LINEAR_FILTER
   /* linear filtering looks much nicer but is much slower for Mesa */
   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#else
   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
#endif

   if (argc > 1)
      file = argv[1];
   else
      file = TEXTURE_FILE;

   ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight);
   if (!ImageYUV) {
      printf("Couldn't read %s\n", TEXTURE_FILE);
      exit(0);
   }

   printf("Image: %dx%d\n", ImgWidth, ImgHeight);

   printf("Calling glTexImage2D\n");
   glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
                GL_YCBCR_MESA, ImgWidth, ImgHeight, 0,
                GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
   printf("Called glTexImage2D\n");
   assert(glGetError() == GL_NO_ERROR);
   printf("* Assert #1\n");

   glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
                   0, 0, ImgWidth, ImgHeight,
                   GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);

   assert(glGetError() == GL_NO_ERROR);
   printf("* Assert #2\n");

   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

   glEnable(GL_TEXTURE_RECTANGLE_ARB);

   glShadeModel(GL_FLAT);
   glClearColor(0.3, 0.3, 0.4, 1.0);

   if (argc > 1 && strcmp(argv[1], "-info")==0) {
      printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
      printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
      printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
      printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
   }
}


int main( int argc, char *argv[] )
{
   glutInit( &argc, argv );
   glutInitWindowSize( 300, 300 );
   glutInitWindowPosition( 0, 0 );
   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
   glutCreateWindow(argv[0] );
   glewInit();

   Init( argc, argv );

   glutReshapeFunc( Reshape );
   glutKeyboardFunc( Key );
   glutSpecialFunc( SpecialKey );
   glutDisplayFunc( Display );

   glutMainLoop();
   return 0;
}

伙计们，有什么建议可以解决这个问题吗？

这很可能是由于驱动程序错误或其他原因造成的。我不会帮你的。然而，回避着色器是不值得的。使用着色器，您可以忘记 GL_MESA_ycbcr_texture 并使您的应用程序更加兼容。

我们将使用普通的旧 GL_LUMINANCE_ALPHA 格式，因此图像加载变为：

glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
            GL_LUMINANCE_ALPHA, ImgWidth, ImgHeight, 0,
            GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, ImageYUV);

glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0,
               0, 0, ImgWidth, ImgHeight,
               GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, ImageYUV);

然后关于着色器：

static const char *p_s_vertex_shader =
    "varying vec2 t;"
    "void main()"
    "{"
    "    t = gl_MultiTexCoord0.xy;"
    "    gl_Position = ftransform();"
    "}";
static const char *p_s_fragment_shader =
    "#extension GL_ARB_texture_rectangle : enable\n"
    "varying vec2 t;"
    "uniform sampler2DRect tex;"
    "void main()"
    "{"
    "    vec2 tcEven = vec2(floor(t.x * .5) * 2.0, t.y);"
    "    vec2 tcOdd = vec2(tcEven.x + 1.0, t.y);"
    "    float Cb = texture2DRect(tex, tcEven).x - .5;"
    "    float Cr = texture2DRect(tex, tcOdd).x - .5;"
    "    float y = texture2DRect(tex, t).w;" // redundant texture read optimized away by texture cache
    "    float r = y + 1.28033 * Cr;"
    "    float g = y - .21482 * Cb - .38059 * Cr;"
    "    float b = y + 2.12798 * Cb;"
    "    gl_FragColor = vec4(r, g, b, 1.0);"
    "}";
int v = glCreateShader(GL_VERTEX_SHADER);
int f = glCreateShader(GL_FRAGMENT_SHADER);
int p = glCreateProgram();
glShaderSource(v, 1, &p_s_vertex_shader, 0);
glShaderSource(f, 1, &p_s_fragment_shader, 0);
glCompileShader(v);
//CheckShader(v);
glCompileShader(f);
//CheckShader(f);
glAttachShader(p, v);
glAttachShader(p, f);
glLinkProgram(p);
glUseProgram(p);
glUniform1i(glGetUniformLocation(p, "tex"), 0);

它出现在纹理之后，位于 Init() 末尾的某个位置。就是这样，就像一个魅力。为了调试，最好也包含 CheckShader() （它报告着色器中的编译错误）：

bool CheckShader(int n_shader_object)
{
    int n_tmp;
    glGetShaderiv(n_shader_object, GL_COMPILE_STATUS, &n_tmp);
    bool b_compiled = n_tmp == GL_TRUE;
    int n_log_length;
    glGetShaderiv(n_shader_object, GL_INFO_LOG_LENGTH, &n_log_length);
    // query status ...

    if(n_log_length > 1) {
        char *p_s_temp_info_log;
        if(!(p_s_temp_info_log = (char*)malloc(n_log_length)))
            return false;
        int n_tmp;
        glGetShaderInfoLog(n_shader_object, n_log_length, &n_tmp,
            p_s_temp_info_log);
        assert(n_tmp <= n_log_length);

        fprintf(stderr, "%s\n", p_s_temp_info_log);
        free(p_s_temp_info_log);
    }
    // get/concat info-log

    return b_compiled;
}

着色器版本可能会比硬件优化版本慢一点，但我想说这没什么好担心的。

如果您决定尝试一下代码，并且有任何问题，请告诉我......

EDIT：实际上在 ATi 上运行这个有一个问题，最后发现传递变量“t”时出错，换句话说，这不起作用：

static const char *p_s_vertex_shader =
    "varying vec2 t;"
    "void main()"
    "{"
    "    t = gl_MultiTexCoord0.xy;"
    "    gl_Position = ftransform();"
    "}";
static const char *p_s_fragment_shader =
    "#extension GL_ARB_texture_rectangle : enable\n"
    "varying vec2 t;"
    "uniform sampler2DRect tex;"
    "void main()"
    "{"
    "    gl_FragColor = texture2DRect(tex, t);"
    "}";

为了轻松解决此问题，只需删除顶点着色器并让固定管道写入纹理坐标即可。所以这也适用于 ATi：

static const char *p_s_vertex_shader = null; // no vertex shader
static const char *p_s_fragment_shader =
    "#extension GL_ARB_texture_rectangle : enable\n"
    "uniform sampler2DRect tex;"
    "void main()"
    "{"
    "    vec2 t = gl_TexCoord[0];" // use fixed pipeline output 
    "    gl_FragColor = texture2DRect(tex, t);"
    "}";