opengl纹理贴图后画面很暗

qwesdfok 2014-08-25 05:57:53

刚试了一下纹理贴图，发现全屏都是黑色，加了color4f(1,1,1,1)后显示图片了，但是颜色怎么那么奇怪- -!
上一下结果和原图，有没有人知道是什么原因？

bmp文件不能传- -~
这是BITMAP的数据

代码如下





#include <glut.h>

#include <Windows.h>



void display(void);

void idle(void);

void reshap(int w, int h);

void keyf(unsigned int key, int x, int y);







BITMAP GetBmp(LPCTSTR title)

{

	static HBITMAP hbmp = 0;

	hbmp = (HBITMAP)::LoadImage(GetModuleHandle(0), title, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE);

	static BITMAP bmp = { 0 };

	GetObject(hbmp, sizeof(BITMAP), &bmp);

	return bmp;

}





void display(void)

{

	static int t = 0;//防止多次申请纹理内存

	glColor3f(0, 0, 0);

	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

	static BITMAP bmp = GetBmp(L"G:/lushi/DLY_0.bmp");

	static GLuint texid;

	if (t == 0)

	{

		glGenTextures(1, &texid);

		glBindTexture(GL_TEXTURE_2D, texid);

		glTexImage2D(GL_TEXTURE_2D, 0, 3, bmp.bmWidth, bmp.bmHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, bmp.bmBits);

		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);

		glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);//这个注释了或者改成GL_REPLACE也没用

	}

	glEnable(GL_TEXTURE_2D);

	glDisable(GL_DEPTH_TEST);

	glBindTexture(GL_TEXTURE_2D, texid);

	glColor4f(1, 1, 1, 1);

	glBegin(GL_QUADS);

	glTexCoord2f(0, 0); glVertex3f(0, 0, 0);

	glTexCoord2f(1, 0); glVertex3f(1, 0, 0);

	glTexCoord2f(1, 1); glVertex3f(1, 1, 0);

	glTexCoord2f(0, 1); glVertex3f(0, 1, 0);

	glEnd();

	glDisable(GL_TEXTURE_2D);

	glFlush();

	t++;

};



void idle(void)

{

	display();

	glutSwapBuffers();

};



void reshap(int w, int h)

{

	static double ratio = 1.0*w / h;

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluPerspective(45, ratio, 0.1, 1000);

	glMatrixMode(GL_MODELVIEW);

	glViewport(0, 0, w, h);

	gluLookAt(0, 0, 3, 0, 0, -1, 0, 1, 0);

};



void keyf(unsigned char key, int x, int y)

{

	if (key == 27)

		exit(0);

};





int main(int argc, char**argv)

{

	glutInit(&argc, argv);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(800, 600);

	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);

	glutCreateWindow("qwer");

	glutDisplayFunc(display);

	glutIdleFunc(idle);

	glutKeyboardFunc(keyf);

	glutReshapeFunc(reshap);

	glutMainLoop();

	return 0;

}