diff options
author | Brian <brian.paul@tungstengraphics.com> | 2007-08-30 14:43:59 -0600 |
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committer | Brian <brian.paul@tungstengraphics.com> | 2007-08-30 14:43:59 -0600 |
commit | f726ffd060a80519cfef63ee2ec3381480802bcc (patch) | |
tree | c8601345a1b162c73e5212b47847e36f32c4e3a1 | |
parent | 942b9bc5bc13d959baa86779a7c669cf96659b9a (diff) |
test flat shading w/ clipping
-rw-r--r-- | progs/trivial/Makefile | 1 | ||||
-rw-r--r-- | progs/trivial/flat-clip.c | 149 |
2 files changed, 150 insertions, 0 deletions
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile index 82769e817a7..d9b200aef2f 100644 --- a/progs/trivial/Makefile +++ b/progs/trivial/Makefile @@ -13,6 +13,7 @@ LIBS = $(APP_LIB_DEPS) SOURCES = \ clear.c \ clear-scissor.c \ + flat-clip.c \ fs-tri.c \ line-clip.c \ line-cull.c \ diff --git a/progs/trivial/flat-clip.c b/progs/trivial/flat-clip.c new file mode 100644 index 00000000000..3e073aca54d --- /dev/null +++ b/progs/trivial/flat-clip.c @@ -0,0 +1,149 @@ +/** + * Test flat shading and clipping. + * + * Brian Paul + * 30 August 2007 + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + +static int Win; +static GLfloat Scale = 2.0, Zrot = 50; +static GLenum Mode = GL_LINE_LOOP; +static GLboolean Smooth = 0; +static GLenum PolygonMode = GL_FILL; + + +static void +Draw(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + if (Smooth) + glShadeModel(GL_SMOOTH); + else + glShadeModel(GL_FLAT); + + glPushMatrix(); + glScalef(Scale, Scale, 1); + glRotatef(Zrot, 0, 0, 1); + + glPolygonMode(GL_FRONT_AND_BACK, PolygonMode); + + glBegin(Mode); + glColor3f(1, 0, 0); + glVertex2f(-1, -1); + glColor3f(0, 1, 0); + glVertex2f( 2, -1); + glColor3f(0, 0, 1); + glVertex2f( 0, 1); + glEnd(); + + glPushMatrix(); + glScalef(0.9, 0.9, 1); + glBegin(Mode); + glColor3f(1, 0, 0); + glVertex2f( 0, 1); + + glColor3f(0, 0, 1); + glVertex2f( 2, -1); + + glColor3f(0, 1, 0); + glVertex2f(-1, -1); + + glEnd(); + glPopMatrix(); + + glPopMatrix(); + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); +} + + +static void +Key(unsigned char key, int x, int y) +{ + (void) x; + (void) y; + switch (key) { + case 'p': + if (Mode == GL_TRIANGLES) + Mode = GL_LINE_LOOP; + else + Mode = GL_TRIANGLES; + break; + case 'f': + if (PolygonMode == GL_POINT) + PolygonMode = GL_LINE; + else if (PolygonMode == GL_LINE) + PolygonMode = GL_FILL; + else + PolygonMode = GL_POINT; + printf("PolygonMode = 0x%x\n", PolygonMode); + break; + case 'r': + Zrot -= 5.0; + break; + case 'R': + Zrot += 5.0; + break; + case 'z': + Scale *= 1.1; + break; + case 'Z': + Scale /= 1.1; + break; + case 's': + Smooth = !Smooth; + break; + case 27: + glutDestroyWindow(Win); + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void +Init(void) +{ + printf("Usage:\n"); + printf(" z/Z: change triangle size\n"); + printf(" r/R: rotate\n"); + printf(" p: toggle line/fill mode\n"); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(400, 400); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); + Win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + Init(); + glutMainLoop(); + return 0; +} |