glsl 多重纹理

#include"glsl.h"

void SHADER::drawBox()

{

    glBegin(GL_QUADS);

    // Front Face

    glNormal3f( 0.0f, 0.0f, 1.0f);

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

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

    glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);

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

    // Back Face

    glNormal3f( 0.0f, 0.0f,-1.0f);

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

    glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);

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

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

    // Top Face

    glNormal3f( 0.0f, 1.0f, 0.0f);

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

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

    glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);

    glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);

    // Bottom Face

    glNormal3f( 0.0f,-1.0f, 0.0f);

    glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);

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

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

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

    // Right face

    glNormal3f( 1.0f, 0.0f, 0.0f);

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

    glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);

    glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);

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

    // Left Face

    glNormal3f(-1.0f, 0.0f, 0.0f);

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

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

    glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);

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

    glEnd();

}

void SHADER::drawMuBox()

{

    glBegin(GL_QUADS);

    glMultiTexCoord2f(GL_TEXTURE0,0.0f, 0.0f);

    glMultiTexCoord2f(GL_TEXTURE1,0.0f, 0.0f);

    glVertex2f(-10.0 , -10.0 );

    glMultiTexCoord2f(GL_TEXTURE0,1.0f, 0.0f);

    glMultiTexCoord2f(GL_TEXTURE1,1.0f, 0.0f);

    glVertex2f( , -10.0 );

    glMultiTexCoord2f(GL_TEXTURE0,1.0f, 1.0f);

    glMultiTexCoord2f(GL_TEXTURE1,1.0f, 1.0f);

    glVertex2f(10.0 , 10.0 );

    glMultiTexCoord2f(GL_TEXTURE0,0.0f, 1.0f);

    glMultiTexCoord2f(GL_TEXTURE1,0.0f, 1.0f);

    glVertex2f(-10.0 , 10.0);

    glEnd();

}

void SHADER::setup()

{

    init_light();

    setShaders();

    m_fps.setup();

    m_img1.Load("2.jpg");

    m_img2.Load("3.jpg");

}

char * SHADER::textFileRead(char *fn)

{

    FILE *fp;

    char *content = NULL;

    int count=;

    if (fn != NULL)

    {

        fp = fopen(fn,"rt");

        if (fp != NULL)

        {

            fseek(fp, , SEEK_END);

            count = ftell(fp);

            rewind(fp);

            if (count > )

            {

                content = (char *)malloc(sizeof(char) * (count+));

                count = fread(content,sizeof(char),count,fp);

                content[count] = '\0';

            }

            fclose(fp);

        }

    }

    return content;

}

void SHADER::setShaders()

{

    char *vs = NULL,*fs = NULL,*fs2 = NULL;

    v = glCreateShader(GL_VERTEX_SHADER);

    f = glCreateShader(GL_FRAGMENT_SHADER);

    f2 = glCreateShader(GL_FRAGMENT_SHADER);

    vs = textFileRead("toonf2.vert");

    fs = textFileRead("toonf2.frag");

    const char * vv = vs;

    const char * ff = fs;

    glShaderSource(v, , &vv,NULL);

    glShaderSource(f, , &ff,NULL);

    free(vs);free(fs);

    glCompileShader(v);

    glCompileShader(f);

    printShaderInfoLog(v);

    printShaderInfoLog(f);

    printShaderInfoLog(f2);

    p = glCreateProgram();

    glAttachShader(p,v);

    glAttachShader(p,f);

    glLinkProgram(p);

    printProgramInfoLog(p);

    glUseProgram(p);

    loc = glGetUniformLocation(p,"time");

    samplerA = glGetUniformLocation(p, "texA");

    glUniform1i(samplerA, ); // pass in texture

    samplerB = glGetUniformLocation(p, "texB");

    glUniform1i(samplerB, ); // pass in texture

}

void SHADER::draw()

{

    static float angle =0.0f;

    static float time =0.0f;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    

    glLoadIdentity();

    glTranslatef(,-,-);

    glRotatef(angle++,,,);

    glUniform1f(loc, time);

    glScalef(6.0,6.0f,6.0);

    //glutSolidTeapot(1);

    glEnable(GL_TEXTURE_2D);

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_2D, m_img1.ID);

    glActiveTexture(GL_TEXTURE1);

    glBindTexture(GL_TEXTURE_2D,m_img2.ID);

//    glBindTexture(GL_TEXTURE_2D,m_img1.ID);

    drawBox();

    //drawMuBox();

    glDisable(GL_TEXTURE_2D);

    time+=0.01f;

    m_fps.update();

    //printf("fps:%d \n",m_fps.getFPS());

}

void SHADER::init_light()

{

    static GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };                 // 环境光参数

    static GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f };                 // 漫射光参数

    static GLfloat LightPosition[]= { 0.0f, 100.0f, 2.0f, 1.0f };                 // 光源位置

    glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);                // 设置环境光

    glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);                // 设置漫射光

    glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);            // 设置光源位置

    glEnable(GL_LIGHT1);                            // 启用一号光源

    glEnable(GL_LIGHTING);

}

int SHADER::printOglError(char *file, int line)

{

    //

    // Returns 1 if an OpenGL error occurred, 0 otherwise.

    //

    GLenum glErr;

    int    retCode = ;

    glErr = glGetError();

    while (glErr != GL_NO_ERROR)

    {

        printf("glError in file %s @ line %d: %s\n", file, line, gluErrorString(glErr));

        retCode = ;

        glErr = glGetError();

    }

    return retCode;

}

void SHADER::printShaderInfoLog(GLuint obj)

{

    int infologLength = ;

    int charsWritten  = ;

    char *infoLog;

    glGetShaderiv(obj, GL_INFO_LOG_LENGTH,&infologLength);

    if (infologLength > )

    {

        infoLog = (char *)malloc(infologLength);

        glGetShaderInfoLog(obj, infologLength, &charsWritten, infoLog);

        printf("%s\n",infoLog);

        free(infoLog);

    }

}

void SHADER::printProgramInfoLog(GLuint obj)

{

    int infologLength = ;

    int charsWritten  = ;

    char *infoLog;

    glGetProgramiv(obj, GL_INFO_LOG_LENGTH,&infologLength);

    if (infologLength > )

    {

        infoLog = (char *)malloc(infologLength);

        glGetProgramInfoLog(obj, infologLength, &charsWritten, infoLog);

        printf("%s\n",infoLog);

        free(infoLog);

    }

}

顶点着色器代码

uniform float time;

varying float colorx;

varying vec4 TexCoord;

void main(void)

{

    vec4 v = vec4(gl_Vertex);

    float temp;

    temp = sin(time*5.0);

    colorx =temp;

    if(colorx<0.2)

    colorx =0.2;

    if(temp<0.5)

    temp=0.5;

    if(temp>1.0)

    temp =1.0;

    //v =v*temp;

    v.z =v.z*temp;

    gl_TexCoord[] =gl_MultiTexCoord0;

    TexCoord = gl_MultiTexCoord0;

    gl_Position = gl_ModelViewProjectionMatrix * v;

}

像素着色器代码：

varying float colorx;

varying vec4 TexCoord;

uniform sampler2D texA;

uniform sampler2D texB;

void main(void)

{

    vec3 color = texture2D(texA,gl_TexCoord[].st).rgb + texture2D(texB,gl_TexCoord[].st).rgb;

    //vec3 color = texture2D(texB,gl_TexCoord[0].st).rgb;

    //vec3 color = texture2D(texA,gl_TexCoord[0].st).rgb;

    color.r =color.r*colorx;

    color.g =color.g*colorx;

    color.b =color.b*colorx;

        gl_FragColor =vec4(color,1.0);  

}

效果：

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glsl 多重纹理

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