幾個OpenGL函數（glRectf() 像素重疊的處理方案）

時間 2019-11-13

標籤幾個 opengl 函數 glrectf 像素重疊處理方案简体版

原文原文鏈接

glRectf(glfloat x1,glfloat y1，glfloat x2,glfloat y2)：x1,y1指定矩形的一個頂點x2,y2指定矩形反方向的頂點。四個點嚴格等於下面的序列（x1,y1）（x2,y1）（x2,y2）（x1,y2）。若是第二個頂點在第一個頂點的上方和右側，那麼這個矩形將以逆時針旋轉方向構造html

glRectf(const glfloat *v1,const glfloat *v2)：v1一個指向矩形的一個頂點的指針，v2一個指向矩形的一個頂點的指針app

像素重疊的解決方案;spa

在渲染環境設置中加入如下兩條語句：指針

glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0f, 0.0f);code

glPolygonOffset(factor, bias);offset的計算公式是factor * DZ + biasorm

http://www.opengl.org/sdk/docs/man/html/glPolygonOffset.xhtml

Name

glPolygonOffset — set the scale and units used to calculate depth valueshtm

C Specification

`void glPolygonOffset(`	GLfloat factor,
	GLfloat units`)`;

Parameters

factorip
Specifies a scale factor that is used to create a variable depth offset for each polygon. The initial value is 0.ci
unitsrem
Is multiplied by an implementation-specific value to create a constant depth offset. The initial value is 0.

Description

When GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT is enabled, each fragment's depth value will be offset after it is interpolated from the depth values of the appropriate vertices. The value of the offset is factor×DZ+r×units, where DZ is a measurement of the change in depth relative to the screen area of the polygon, and r is the smallest value that is guaranteed to produce a resolvable offset for a given implementation. The offset is added before the depth test is performed and before the value is written into the depth buffer.