diff options
| -rw-r--r-- | progs/tests/blendsquare.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/progs/tests/blendsquare.c b/progs/tests/blendsquare.c index 37ad3845b99..1694866a557 100644 --- a/progs/tests/blendsquare.c +++ b/progs/tests/blendsquare.c @@ -25,7 +25,7 @@ /** * \file blendsquare.c * - * Simple test of GL_NV_blend_square functionality. Three squares are drawn + * Simple test of GL_NV_blend_square functionality. Four squares are drawn * with different blending modes, but all should be rendered with the same * final color. * @@ -36,7 +36,7 @@ #include <stdlib.h> #include <GL/glut.h> -static int Width = 300; +static int Width = 400; static int Height = 200; static const GLfloat Near = 5.0, Far = 25.0; @@ -47,7 +47,8 @@ static void Display( void ) glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); - glTranslatef(-3.0, 0, 0); + + glTranslatef(-4.5, 0, 0); glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); glColor3f( 0.5 * 0.5, 0.5 * 0.5, 0.5 * 0.5 ); @@ -57,8 +58,9 @@ static void Display( void ) glVertex2f(-1, 1); glEnd(); + glTranslatef(3.0, 0, 0); - glBlendFunc( GL_SRC_COLOR, GL_ZERO ); + glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); glColor3f( 0.5, 0.5, 0.5 ); glVertex2f(-1, -1); @@ -67,6 +69,25 @@ static void Display( void ) glVertex2f(-1, 1); glEnd(); + glBlendFunc( GL_DST_COLOR, GL_ZERO ); + glBegin(GL_QUADS); + glVertex2f(-1, -1); + glVertex2f( 1, -1); + glVertex2f( 1, 1); + glVertex2f(-1, 1); + glEnd(); + + + glTranslatef(3.0, 0, 0); + glBlendFunc( GL_SRC_COLOR, GL_ZERO ); + glBegin(GL_QUADS); + glVertex2f(-1, -1); + glVertex2f( 1, -1); + glVertex2f( 1, 1); + glVertex2f(-1, 1); + glEnd(); + + glTranslatef(3.0, 0, 0); glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); @@ -120,7 +141,8 @@ static void Key( unsigned char key, int x, int y ) static void Init( void ) { - const char * const ver_string = (const char * const) glGetString( GL_VERSION ); + const char * const ver_string = (const char * const) + glGetString( GL_VERSION ); const double version = strtod( ver_string, NULL ); printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); @@ -131,7 +153,10 @@ static void Init( void ) exit(1); } - printf("All 3 squares should be the same color.\n"); + printf("\nAll 4 squares should be the same color. The two on the left are drawn\n" + "without NV_blend_square functionality, and the two on the right are drawn\n" + "with NV_blend_square functionality. If the two on the left are dark, but\n" + "the two on the right are not, then NV_blend_square is broken.\n"); glEnable( GL_BLEND ); glBlendEquation( GL_FUNC_ADD ); } |