Question

我正在尝试渲染一组200个RGB帧。为了做同样的事情，我正在创建一个高度为416和宽度为240的纹理。但是我只是得到一个黑色的屏幕，打印语句在后台工作。

以下是我的代码：

#include <stdio.h>
#include <stdlib.h>
#include "glew.h"
#include "glfw.h"
#include "glaux.h"

int index;
AUX_RGBImageRec texture1;
GLuint  texture;
unsigned long long pos;
unsigned char *guibuffer;
HDC hDC = NULL;

void initGL(void)
{
        int maxSz;
        int maxwidth = 416;
        int maxheight = 240;

        if( !glfwInit() )
        {
            exit( EXIT_FAILURE );
        }


        // if( !glfwOpenWindow(4096, 2118, 0,0,0,0,0,0, GLFW_WINDOW ) )
        if( !glfwOpenWindow(maxwidth, maxheight, 0,0,0,0,0,0, GLFW_WINDOW  ) ) //GLFW_FULLSCREEN
        {
            glfwTerminate();
            exit( EXIT_FAILURE );
        }

        glfwSetWindowTitle("sample");
               glGetIntegerv(GL_MAX_TEXTURE_SIZE,&maxSz);

        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);       // This Will Clear The Background Color To Black
        glClearDepth(1.0);                          // Enables Clearing Of The Depth Buffer
        glDepthFunc(GL_LESS);                       // The Type Of Depth Test To Do
        glEnable(GL_DEPTH_TEST);                    // Enables Depth Testing
        glShadeModel(GL_SMOOTH);                    // Enables Smooth Color Shading


        glMatrixMode(GL_PROJECTION);
        //glLoadIdentity();



        hDC= wglGetCurrentDC();
#if 1
        { // TSS
            HWND hCurrentWindow = GetActiveWindow();
            char szTitle[256]="sample";
            //SetWindowText(hCurrentWindow,szTitle );
            // SetWindowLongA (hCurrentWindow , GWL_STYLE, (GetWindowLongA (hCurrentWindow , GWL_STYLE) & ~(WS_CAPTION)));
            SetWindowLongA (hCurrentWindow, GWL_STYLE, (WS_VISIBLE));
        }
#endif

        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);

}

int GL_Disply()
{
    FILE *fptr=fopen("E:\\myRGB.rgb","rb");
    fseek(fptr,pos,SEEK_SET);
    fread(guibuffer,sizeof(unsigned char),sizeof(unsigned char)*416*240*3,fptr);
    pos+=416*240*3;
    texture1.sizeX =416;
    texture1.sizeY =240;
    texture1.data = guibuffer;

    glDepthFunc(GL_ALWAYS);
    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);
    glDisable(GL_LIGHTING);

    glEnable(GL_TEXTURE_2D);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture1.sizeX, texture1.sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);

    glBegin(GL_QUADS);

    //glNormal3f( 0.0f, 0.0f, 0.0f);
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, -1.0f,  0.0f);
    glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, -1.0f,  0.0f);
    glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  0.0f);
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  0.0f);

    glEnd();

    glDisable(GL_BLEND); 
    glEnable(GL_DEPTH_TEST);

    // Swap front and back rendering buffers
    glfwSwapBuffers();
    glDeleteTextures(1, &texture);

}

int main(int argc, char *argv[])
{
    initGL(); // GL initialization

    /* CPU memory allocation using C - malloc */
    guibuffer=(unsigned char*)malloc(sizeof(unsigned char)*416*240*3);

    for(index=0;index<200;index++)
    {
                printf("frame %d displayed....\r",index);
        GL_Disply();
    }
    return 0;
}

有谁能告诉我哪里出错了？

Answer 1

您没有将数据（最后一个参数）传递给glTexImage2D函数。我想你想传递来自 E：\ myRGB.rgb 文件的数据。

Answer 2

它可能与矩阵堆栈有关。我认为你想在绘制东西时使用glMatrixMode（GL_MODELVIEW），而不是GL_PROJECTION，你可能需要正确设置矩阵。虽然，glMatrixMode，glBegin，glEnd，glTexCoord，glVertex3f，是旧的固定功能渲染方式。使用着色器是使用OpenGL进行渲染的现代方法。

无法使用纹理在openGL中渲染RGB帧

2 个答案: