Initial revision

1 files changed, 375 insertions, 0 deletions

diff --git a/progs/samples/stretch.c b/progs/samples/stretch.c
new file mode 100644
index 00000000000..3f610e77de0
--- /dev/null
+++ b/progs/samples/stretch.c
@@ -0,0 +1,375 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
+ * ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+#define STEPCOUNT 40
+#define FALSE 0
+#define TRUE 1
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+
+
+enum {
+    OP_NOOP = 0,
+    OP_STRETCH,
+    OP_DRAWPOINT,
+    OP_DRAWIMAGE
+};
+
+
+typedef struct _cRec {
+    float x, y;
+} cRec;
+
+typedef struct _vertexRec {
+    float x, y;
+    float dX, dY;
+    float tX, tY;
+} vertexRec;
+
+
+#include "loadppm.c"
+
+GLenum doubleBuffer;
+int imageSizeX, imageSizeY;
+char *fileName = 0;
+PPMImage *image;
+cRec cList[50];
+vertexRec vList[5];
+int cCount, cIndex[2], cStep;
+GLenum op = OP_NOOP;
+
+
+void DrawImage(void)
+{
+
+    glRasterPos2i(0, 0);
+    glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
+		 image->data);
+
+    glFlush();
+    if (doubleBuffer) {
+	glutSwapBuffers();
+    }
+
+    glRasterPos2i(0, 0);
+    glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
+		 image->data);
+}
+
+void DrawPoint(void)
+{
+    int i;
+
+    glColor3f(1.0, 0.0, 1.0);
+    glPointSize(3.0);
+    glBegin(GL_POINTS);
+	for (i = 0; i < cCount; i++) {
+	    glVertex2f(cList[i].x, cList[i].y);
+	}
+    glEnd();
+
+    glFlush();
+    if (doubleBuffer) {
+	glutSwapBuffers();
+    }
+}
+
+void InitVList(void)
+{
+
+    vList[0].x = 0.0;
+    vList[0].y = 0.0;
+    vList[0].dX = 0.0;
+    vList[0].dY = 0.0;
+    vList[0].tX = 0.0;
+    vList[0].tY = 0.0;
+
+    vList[1].x = (float)imageSizeX;
+    vList[1].y = 0.0;
+    vList[1].dX = 0.0;
+    vList[1].dY = 0.0;
+    vList[1].tX = 1.0;
+    vList[1].tY = 0.0;
+
+    vList[2].x = (float)imageSizeX;
+    vList[2].y = (float)imageSizeY;
+    vList[2].dX = 0.0;
+    vList[2].dY = 0.0;
+    vList[2].tX = 1.0;
+    vList[2].tY = 1.0;
+
+    vList[3].x = 0.0;
+    vList[3].y = (float)imageSizeY;
+    vList[3].dX = 0.0;
+    vList[3].dY = 0.0;
+    vList[3].tX = 0.0;
+    vList[3].tY = 1.0;
+
+    vList[4].x = cList[0].x;
+    vList[4].y = cList[0].y;
+    vList[4].dX = (cList[1].x - cList[0].x) / STEPCOUNT;
+    vList[4].dY = (cList[1].y - cList[0].y) / STEPCOUNT;
+    vList[4].tX = cList[0].x / (float)imageSizeX;
+    vList[4].tY = cList[0].y / (float)imageSizeY;
+}
+
+void ScaleImage(int sizeX, int sizeY)
+{
+    GLubyte *buf;
+
+    buf = (GLubyte *)malloc(3*sizeX*sizeY);
+    gluScaleImage(GL_RGB, image->sizeX, image->sizeY, GL_UNSIGNED_BYTE,
+                  image->data, sizeX, sizeY, GL_UNSIGNED_BYTE, buf);
+    free(image->data);
+    image->data = buf;
+    image->sizeX = sizeX;
+    image->sizeY = sizeY;
+}
+
+void SetPoint(int x, int y)
+{
+
+    cList[cCount].x = (float)x;
+    cList[cCount].y = (float)y;
+    cCount++;
+}
+
+void Stretch(void)
+{
+
+    glBegin(GL_TRIANGLES);
+	glTexCoord2f(vList[0].tX, vList[0].tY);
+	glVertex2f(vList[0].x, vList[0].y);
+	glTexCoord2f(vList[1].tX, vList[1].tY);
+	glVertex2f(vList[1].x, vList[1].y);
+	glTexCoord2f(vList[4].tX, vList[4].tY);
+	glVertex2f(vList[4].x, vList[4].y);
+    glEnd();
+
+    glBegin(GL_TRIANGLES);
+	glTexCoord2f(vList[1].tX, vList[1].tY);
+	glVertex2f(vList[1].x, vList[1].y);
+	glTexCoord2f(vList[2].tX, vList[2].tY);
+	glVertex2f(vList[2].x, vList[2].y);
+	glTexCoord2f(vList[4].tX, vList[4].tY);
+	glVertex2f(vList[4].x, vList[4].y);
+    glEnd();
+
+    glBegin(GL_TRIANGLES);
+	glTexCoord2f(vList[2].tX, vList[2].tY);
+	glVertex2f(vList[2].x, vList[2].y);
+	glTexCoord2f(vList[3].tX, vList[3].tY);
+	glVertex2f(vList[3].x, vList[3].y);
+	glTexCoord2f(vList[4].tX, vList[4].tY);
+	glVertex2f(vList[4].x, vList[4].y);
+    glEnd();
+
+    glBegin(GL_TRIANGLES);
+	glTexCoord2f(vList[3].tX, vList[3].tY);
+	glVertex2f(vList[3].x, vList[3].y);
+	glTexCoord2f(vList[0].tX, vList[0].tY);
+	glVertex2f(vList[0].x, vList[0].y);
+	glTexCoord2f(vList[4].tX, vList[4].tY);
+	glVertex2f(vList[4].x, vList[4].y);
+    glEnd();
+
+    glFlush();
+    if (doubleBuffer) {
+	glutSwapBuffers();
+    }
+
+    if (++cStep < STEPCOUNT) {
+	vList[4].x += vList[4].dX;
+	vList[4].y += vList[4].dY;
+    } else {
+	cIndex[0] = cIndex[1];
+	cIndex[1] = cIndex[1] + 1;
+	if (cIndex[1] == cCount) {
+	    cIndex[1] = 0;
+	}
+	vList[4].dX = (cList[cIndex[1]].x - cList[cIndex[0]].x) / STEPCOUNT;
+	vList[4].dY = (cList[cIndex[1]].y - cList[cIndex[0]].y) / STEPCOUNT;
+	cStep = 0;
+    }
+}
+
+void Key(unsigned char key, int x, int y)
+{
+
+    switch (key) {
+      case 27:
+	free(image->data);
+        exit(1);
+      case 32:
+	if (cCount > 1) {
+	    InitVList();
+	    cIndex[0] = 0;
+	    cIndex[1] = 1;
+	    cStep = 0;
+	    glEnable(GL_TEXTURE_2D);
+	    op = OP_STRETCH;
+	}
+	break;
+      default:
+	return;
+    }
+
+    glutPostRedisplay();
+}
+
+void Mouse(int button, int state, int mouseX, int mouseY)
+{
+
+    if (state != GLUT_DOWN)
+	return;
+
+    if (op == OP_STRETCH) {
+	glDisable(GL_TEXTURE_2D);
+	cCount = 0;
+	op = OP_DRAWIMAGE;
+    } else {
+	SetPoint(mouseX, imageSizeY-mouseY);
+	op = OP_DRAWPOINT;
+    }
+
+    glutPostRedisplay();
+}
+
+void Animate(void)
+{
+
+    switch (op) {
+      case OP_STRETCH:
+	Stretch();
+	break;
+      case OP_DRAWPOINT:
+	DrawPoint();
+	break;
+      case OP_DRAWIMAGE:
+	DrawImage();
+	break;
+      default:
+        break;
+    }
+}
+
+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 if (strcmp(argv[i], "-f") == 0) {
+	    if (i+1 >= argc || argv[i+1][0] == '-') {
+		printf("-f (No file name).\n");
+		return GL_FALSE;
+	    } else {
+		fileName = argv[++i];
+	    }
+	} else {
+	    printf("%s (Bad option).\n", argv[i]);
+	    return GL_FALSE;
+	}
+    }
+    return GL_TRUE;
+}
+
+void GLUTCALLBACK glut_post_redisplay_p(void)
+{
+      glutPostRedisplay();
+}
+
+int main(int argc, char **argv)
+{
+    GLenum type;
+
+    glutInit(&argc, argv);
+
+    if (Args(argc, argv) == GL_FALSE) {
+	exit(1);
+    }
+
+    if (fileName == 0) {
+	printf("No image file.\n");
+	exit(1);
+    }
+
+    image = LoadPPM(fileName);
+
+    /* changed powf and logf to pow and log -Brian */
+    imageSizeX = (int)pow(2.0, (float)((int)(log(image->sizeX)/log(2.0))));
+    imageSizeY = (int)pow(2.0, (float)((int)(log(image->sizeY)/log(2.0))));
+
+    glutInitWindowPosition(0, 0); glutInitWindowSize( imageSizeX, imageSizeY);
+
+    type = GLUT_RGB;
+    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+    glutInitDisplayMode(type);
+
+    if (glutCreateWindow("Stretch") == GL_FALSE) {
+        exit(1);
+    }
+
+    glViewport(0, 0, imageSizeX, imageSizeY);
+    gluOrtho2D(0, imageSizeX, 0, imageSizeY);
+    glClearColor(0.0, 0.0, 0.0, 0.0);
+
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glPixelStorei(GL_PACK_ALIGNMENT, 1);
+
+    ScaleImage(imageSizeX, imageSizeY);
+
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexImage2D(GL_TEXTURE_2D, 0, 3, image->sizeX, image->sizeY, 0,
+                 GL_RGB, GL_UNSIGNED_BYTE, (unsigned char *)image->data);
+
+    cCount = 0;
+    cIndex[0] = 0;
+    cIndex[1] = 0;
+    cStep = 0;
+    op = OP_DRAWIMAGE;
+
+    glutKeyboardFunc(Key);
+    glutMouseFunc(Mouse);
+    glutDisplayFunc(Animate);
+    glutIdleFunc(glut_post_redisplay_p);
+    glutMainLoop();
+	return 0;
+}