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demos/readpix: add option to draw triangle instead of drawpix

This commit is contained in:
Keith Whitwell 2009-04-22 15:19:44 +01:00
parent 510a44eea7
commit eb5d96968f
1 changed files with 62 additions and 5 deletions
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67
progs/demos/readpix.c
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@ -17,6 +17,7 @@
#define IMAGE_FILE "../images/girl.rgb"
static int ImgWidth, ImgHeight;
static int WinWidth, WinHeight;
static GLenum ImgFormat;
static GLubyte *Image = NULL;
@ -27,6 +28,7 @@ static int CPosX, CPosY; /* copypixels */
static GLboolean DrawFront = GL_FALSE;
static GLboolean ScaleAndBias = GL_FALSE;
static GLboolean Benchmark = GL_FALSE;
static GLboolean Triangle = GL_FALSE;
static GLubyte *TempImage = NULL;
#define COMBO 1
@ -150,11 +152,60 @@ Display( void )
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
if (!Triangle) {
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
}
else {
float z = 0;
glViewport(APosX, APosY, ImgWidth, ImgHeight);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glDisable(GL_CULL_FACE);
/* Red should never be seen
*/
glBegin(GL_POLYGON);
glColor3f(1,0,0);
glVertex3f(-2, -2, z);
glVertex3f(-2, 2, z);
glVertex3f(2, 2, z);
glVertex3f(2, -2, z);
glEnd();
/* Blue background
*/
glBegin(GL_POLYGON);
glColor3f(.5,.5,1);
glVertex3f(-1, -1, z);
glVertex3f(-1, 1, z);
glVertex3f(1, 1, z);
glVertex3f(1, -1, z);
glEnd();
/* Triangle
*/
glBegin(GL_TRIANGLES);
glColor3f(.8,0,0);
glVertex3f(-0.9, -0.9, z);
glColor3f(0,.9,0);
glVertex3f( 0.9, -0.9, z);
glColor3f(0,0,.7);
glVertex3f( 0.0, 0.9, z);
glEnd();
glColor3f(1,1,1);
glViewport( 0, 0, WinWidth, WinHeight );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0.0, WinWidth, 0.0, WinHeight, -1.0, 1.0 );
}
/* might try alignment=4 here for testing */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
@ -218,6 +269,9 @@ Display( void )
static void
Reshape( int width, int height )
{
WinWidth = width;
WinHeight = height;
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
@ -236,6 +290,9 @@ Key( unsigned char key, int x, int y )
case 'b':
Benchmark = GL_TRUE;
break;
case 't':
Triangle = !Triangle;
break;
case 's':
ScaleAndBias = !ScaleAndBias;
break;