diff options
Diffstat (limited to 'progs/samples/blendxor.c')
-rw-r--r-- | progs/samples/blendxor.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/progs/samples/blendxor.c b/progs/samples/blendxor.c deleted file mode 100644 index 057143651fd..00000000000 --- a/progs/samples/blendxor.c +++ /dev/null @@ -1,203 +0,0 @@ -/* -** blendxor.c - Demonstrates the use of the blend_logic_op -** extension to draw hilights. Using XOR to draw the same -** image twice restores the background to its original value. -*/ - -#include <stdio.h> -#include <string.h> -#ifndef _WIN32 -#include <unistd.h> -#endif -#include <stdlib.h> -#include <GL/glew.h> -#include <GL/glut.h> - - -GLenum doubleBuffer; -int dithering = 0; -int use11ops = 0; -int supportlogops = 0; -GLint windW, windH; - -static void Init(void) -{ - glDisable(GL_DITHER); - glShadeModel(GL_FLAT); -} - -static void Reshape(int width, int height) -{ - - windW = (GLint)width; - windH = (GLint)height; - - glViewport(0, 0, (GLint)width, (GLint)height); - - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - gluOrtho2D(0, 400, 0, 400); - glMatrixMode(GL_MODELVIEW); -} - -static void Key(unsigned char key, int x, int y) -{ - - switch (key) { - case 27: - exit(1); - case 'd': - dithering = !dithering; - break; - case 'l': - if (supportlogops == 3) - use11ops = (!use11ops); - if (use11ops) - printf("Using GL 1.1 color logic ops.\n"); - else printf("Using GL_EXT_blend_logic_op.\n"); - break; - default: - return; - } - - glutPostRedisplay(); -} - -static void Draw(void) -{ - int i; - - glDisable(GL_BLEND); - if (supportlogops & 2) - glDisable(GL_COLOR_LOGIC_OP); - - (dithering) ? glEnable(GL_DITHER) : glDisable(GL_DITHER); - - glClearColor(0.5, 0.6, 0.1, 1.0); - glClear(GL_COLOR_BUFFER_BIT); - - /* Draw background prims */ - glColor3f(0.1, 0.1, 1.0); - glBegin(GL_TRIANGLES); - glVertex2i(5, 5); - glVertex2i(130, 50); - glVertex2i(100, 300); - glEnd(); - glColor3f(0.5, 0.2, 0.9); - glBegin(GL_TRIANGLES); - glVertex2i(200, 100); - glVertex2i(330, 50); - glVertex2i(340, 400); - glEnd(); - - glEnable(GL_BLEND); - if (!use11ops) - glBlendEquationEXT(GL_LOGIC_OP); - else - glEnable(GL_COLOR_LOGIC_OP); - glLogicOp(GL_XOR); - - /* Draw a set of rectangles across the window */ - glColor3f(0.9, 0.2, 0.8); - for(i = 0; i < 400; i+=60) { - glBegin(GL_POLYGON); - glVertex2i(i, 100); - glVertex2i(i+50, 100); - glVertex2i(i+50, 200); - glVertex2i(i, 200); - glEnd(); - } - glFlush(); /* Added by Brian Paul */ -#ifndef _WIN32 - sleep(2); -#endif - - /* Redraw the rectangles, which should erase them */ - for(i = 0; i < 400; i+=60) { - glBegin(GL_POLYGON); - glVertex2i(i, 100); - glVertex2i(i+50, 100); - glVertex2i(i+50, 200); - glVertex2i(i, 200); - glEnd(); - } - glFlush(); - - - if (doubleBuffer) { - glutSwapBuffers(); - } -} - -static GLenum Args(int argc, char **argv) -{ - GLint i; - - doubleBuffer = GL_FALSE; - - for (i = 1; i < argc; i++) { - if (strcmp(argv[i], "-sb") == 0) { - doubleBuffer = GL_FALSE; - } else if (strcmp(argv[i], "-db") == 0) { - doubleBuffer = GL_TRUE; - } else { - printf("%s (Bad option).\n", argv[i]); - return GL_FALSE; - } - } - return GL_TRUE; -} - -int main(int argc, char **argv) -{ - GLenum type; - char *s; - char *extName = "GL_EXT_blend_logic_op"; - char *version; - - glutInit(&argc, argv); - - if (Args(argc, argv) == GL_FALSE) { - exit(1); - } - - glutInitWindowPosition(0, 0); glutInitWindowSize( 400, 400); - - type = GLUT_RGB; - type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; - glutInitDisplayMode(type); - - if (glutCreateWindow("Blend XOR") == GL_FALSE) { - exit(1); - } - - glewInit(); - - /* Make sure blend_logic_op extension is there. */ - s = (char *) glGetString(GL_EXTENSIONS); - version = (char*) glGetString(GL_VERSION); - if (!s) - exit(1); - if (strstr(s,extName)) { - supportlogops = 1; - use11ops = 0; - printf("blend_logic_op extension available.\n"); - } - if (strncmp(version,"1.1",3)>=0) { - supportlogops += 2; - use11ops = 1; - printf("1.1 color logic ops available.\n"); - } - if (supportlogops == 0) { - printf("Blend_logic_op extension and GL 1.1 not present.\n"); - exit(1); - } - - Init(); - - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Draw); - glutMainLoop(); - return 0; -} |