Function DrawQuad

test_common/gles/helpers.cpp:371–419

}

static void DrawQuad(void)
{
    const char *vssrc =
        "varying   mediump vec2 texCoord;\n"
        "attribute vec2 inPosition;\n"
        "void main() {\n"
        "    texCoord    = vec2((inPosition.x+1.0)/2.0, (inPosition.y+1.0)/2.0);\n"
        "    gl_Position = vec4(inPosition.x, inPosition.y, 0.0, 1.0);\n"
        "}\n";
    const char *fssrc =
        "uniform sampler2D tex;\n"
        "varying mediump vec2      texCoord;\n"
        "void main() {\n"
        "    gl_FragColor =  texture2D(tex, texCoord);\n"
        "}\n";
    GLuint vs, fs, program;
    GLuint positionIdx = 0;
    GLfloat x1 = -1.0f, x2 = 1.0f, y1 = -1.0f, y2 = 1.0f;
    GLfloat vertices[4][2];
    vertices[0][0] = x1; vertices[0][1] = y1;
    vertices[1][0] = x2; vertices[1][1] = y1;
    vertices[2][0] = x1; vertices[2][1] = y2;
    vertices[3][0] = x2; vertices[3][1] = y2;

    vs = glCreateShader(GL_VERTEX_SHADER);
    fs = glCreateShader(GL_FRAGMENT_SHADER);

    glShaderSource(vs, 1, &vssrc, NULL);
    glShaderSource(fs, 1, &fssrc, NULL);

    glCompileShader(vs);
    glCompileShader(fs);

    program = glCreateProgram();
    glAttachShader(program, vs);
    glAttachShader(program, fs);
    glLinkProgram(program);
    glUseProgram(program);

    positionIdx = glGetAttribLocation(program, "inPosition");
    glEnableVertexAttribArray(positionIdx);
    glVertexAttribPointer(positionIdx, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

    glUseProgram(0);
    glDeleteProgram(program);
    glDeleteShader(vs);
    glDeleteShader(fs);
}

void * CreateGLRenderbuffer( GLsizei width, GLsizei height,
                             GLenum attachment,