111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
#include "pch.c"
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#pragma hdrstop
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#include <math.h>
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static GLfloat ctrlpoints[4][4][3] = {
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{{ -1.5, -1.5, 4.0}, { -0.5, -1.5, 2.0},
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{0.5, -1.5, -1.0}, {1.5, -1.5, 2.0}},
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{{ -1.5, -0.5, 1.0}, { -0.5, -0.5, 3.0},
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{0.5, -0.5, 0.0}, {1.5, -0.5, -1.0}},
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{{ -1.5, 0.5, 4.0}, { -0.5, 0.5, 0.0},
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{0.5, 0.5, 3.0}, {1.5, 0.5, 4.0}},
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{{ -1.5, 1.5, -2.0}, { -0.5, 1.5, -2.0},
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{0.5, 1.5, 0.0}, {1.5, 1.5, -1.0}}
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};
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static GLfloat texpts[2][2][2] = {{{0.0, 0.0}, {0.0, 1.0}},
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{{1.0, 0.0}, {1.0, 1.0}}};
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static void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glColor3f(1.0, 1.0, 1.0);
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glEvalMesh2(GL_FILL, 0, 20, 0, 20);
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glFlush();
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}
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#define imageWidth 64
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#define imageHeight 64
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GLubyte image[3*imageWidth*imageHeight];
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static void makeImage(void)
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{
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int i, j;
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float ti, tj;
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for (i = 0; i < imageWidth; i++) {
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ti = 2.0*3.14159265*i/imageWidth;
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for (j = 0; j < imageHeight; j++) {
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tj = 2.0*3.14159265*j/imageHeight;
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image[3*(imageHeight*i+j)] = (GLubyte) 127*(1.0+sin(ti));
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image[3*(imageHeight*i+j)+1] = (GLubyte) 127*(1.0+cos(2*tj));
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image[3*(imageHeight*i+j)+2] = (GLubyte) 127*(1.0+cos(ti+tj));
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}
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}
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}
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static void myinit(void)
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{
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4,
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0, 1, 12, 4, &ctrlpoints[0][0][0]);
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glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2,
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0, 1, 4, 2, &texpts[0][0][0]);
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glEnable(GL_MAP2_TEXTURE_COORD_2);
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glEnable(GL_MAP2_VERTEX_3);
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glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
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makeImage();
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, imageWidth, imageHeight, 0,
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GL_RGB, GL_UNSIGNED_BYTE, image);
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_NORMALIZE);
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glShadeModel (GL_FLAT);
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}
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static void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (w <= h)
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glOrtho(-4.0, 4.0, -4.0*(GLfloat)h/(GLfloat)w,
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4.0*(GLfloat)h/(GLfloat)w, -4.0, 4.0);
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else
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glOrtho(-4.0*(GLfloat)w/(GLfloat)h,
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4.0*(GLfloat)w/(GLfloat)h, -4.0, 4.0, -4.0, 4.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef(85.0, 1.0, 1.0, 1.0);
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}
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#define WIDTH 300
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#define HEIGHT 300
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static void OglBounds(int *w, int *h)
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{
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*w = WIDTH;
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*h = HEIGHT;
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}
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static void OglDraw(int w, int h)
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{
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myinit();
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myReshape(w, h);
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display();
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}
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OglModule oglmod_texsurf =
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{
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"texsurf",
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NULL,
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OglBounds,
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NULL,
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OglDraw
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};
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