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-rw-r--r--progs/demos/readpix.c67
1 files changed, 62 insertions, 5 deletions
diff --git a/progs/demos/readpix.c b/progs/demos/readpix.c
index c0aac2272f..bbb3a68eff 100644
--- a/progs/demos/readpix.c
+++ b/progs/demos/readpix.c
@@ -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;