c++ - 形状中的 OpenGL 着色

Question

我正在为一个大学项目重新创建旧游戏“Chuckie egg”，我使用下面的代码很好地绘制了角色，但我不确定在 glBegin(?) 中使用什么类型来为对象着色中。

我已经尝试过 GL_QUADS、GL_TRIANGLE_FAN、GL_TRIANGLE_STRIP 和 GL_QUAD_STRIP，但唯一没有显示错误的是 GL_LINE_LOOP，但这当然不会为整个形状着色。

有人知道如何解决这个问题吗？

void drawMan(void){

//main body outline
glBegin(GL_LINE_LOOP);

//set our colour
glColor3ub(255, 255, 0); // yellow

glVertex2f(-0.25f, 1.0f);
glVertex2f(0.25f, 1.0f);
glVertex2f(0.25f, 0.875f);
glVertex2f(0.5f, 0.875f);
glVertex2f(0.5f, 0.75f);
glVertex2f(1.0f, 0.75f);
glVertex2f(1.0f, 0.625f);
glVertex2f(0.5f, 0.625f);
glVertex2f(0.5f, 0.375f);
glVertex2f(0.0f, 0.375f);
glVertex2f(0.0f, 0.25f);
glVertex2f(0.25f, 0.25f);
glVertex2f(0.25f, 0.125f);
glVertex2f(0.5f, 0.125f);
glVertex2f(0.5f, 0.0f);
glVertex2f(0.75f, 0.0f);
glVertex2f(0.75f, -0.5f);
glVertex2f(0.5f, -0.5f);
glVertex2f(0.5f, -0.625f);
glVertex2f(0.25f, -0.625f);
glVertex2f(0.25f, -0.75f);
glVertex2f(0.0f, -0.75f);
glVertex2f(0.0f, -0.875f);
glVertex2f(0.25f, -0.875f);
glVertex2f(0.25f, -1.0f);
glVertex2f(-0.25f, -1.0f);
glVertex2f(-0.25f, -0.625f);
glVertex2f(-0.5f, -0.625f);
glVertex2f(-0.5f, -0.5f);
glVertex2f(-0.75f, -0.5f);
glVertex2f(-0.75f, 0.0f);
glVertex2f(-0.5f, 0.0f);
glVertex2f(-0.5f, 0.125f);
glVertex2f(-0.25f, 0.125f);
glVertex2f(-0.25f, 0.375f);
glVertex2f(-0.5f, 0.375f);
glVertex2f(-0.5f, 0.625f);
glVertex2f(-1.0f, 0.625f);
glVertex2f(-1.0f, 0.75f);
glVertex2f(-0.5f, 0.75f);
glVertex2f(-0.5f, 0.85f);
glVertex2f(-0.25f, 0.85f);
//glVertex2f(-0.25f, 1.0f);

glEnd();

//eyes
glBegin(GL_LINE_LOOP);

glColor3ub(0, 0, 0); // black

glVertex2f(0.0f, 0.625f);
glVertex2f(0.25f, 0.625f);
glVertex2f(0.25f, 0.5f);
glVertex2f(0.0f, 0.5f);

glEnd();


//arm

glBegin(GL_LINE_LOOP);

glColor3ub(0, 0, 0); // black

glVertex2f(-0.25f, 0.0f);
glVertex2f(0.0f, 0.0f);
glVertex2f(0.0f, -0.5f);
glVertex2f(-0.25f, -0.5f);

glEnd();}

Answer 1

你不能随便画一个轮廓然后给它上色。你必须正确地三角化你的形状。

实际上，这是一个可以输出合理几何图形的绘图包或使用纹理代替的工作。