diff options
Diffstat (limited to 'nx-X11/extras/Mesa_6.4.2/progs/samples/blendxor.c')
| -rw-r--r-- | nx-X11/extras/Mesa_6.4.2/progs/samples/blendxor.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa_6.4.2/progs/samples/blendxor.c b/nx-X11/extras/Mesa_6.4.2/progs/samples/blendxor.c new file mode 100644 index 000000000..5bc4aa9be --- /dev/null +++ b/nx-X11/extras/Mesa_6.4.2/progs/samples/blendxor.c @@ -0,0 +1,206 @@ +/* +** 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> +#ifdef _WIN32 +#include <windows.h> +#endif +#define GL_GLEXT_LEGACY +#define GL_GLEXT_PROTOTYPES +#include <GL/glut.h> +#include <GL/glext.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); + } + + /* 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; +} |