KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use arrow keys to pan and z/Z to zoom in/out to explore the fractal.

This commit is contained in:
Brian 2007-01-15 17:48:19 -07:00
parent 2ccd264695
commit 0d55346156
1 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
progs/glsl/mandelbrot.c
View File

@ -39,8 +39,8 @@ static struct uniform_info Uniforms[] = {
{ "Shininess", 1, -1, { 20.0, 0, 0, 0 } }, { "Shininess", 1, -1, { 20.0, 0, 0, 0 } },
/* frag */ /* frag */
{ "MaxIterations", 1, -1, { 12, 0, 0, 0 } }, { "MaxIterations", 1, -1, { 12, 0, 0, 0 } },
{ "Zoom", 1, -1, { 0.5, 0, 0, 0 } }, { "Zoom", 1, -1, { 0.125, 0, 0, 0 } },
{ "Xcenter", 1, -1, { -1.0, 0, 0, 0 } }, { "Xcenter", 1, -1, { -1.5, 0, 0, 0 } },
{ "Ycenter", 1, -1, { .005, 0, 0, 0 } }, { "Ycenter", 1, -1, { .005, 0, 0, 0 } },
{ "InnerColor", 3, -1, { 1, 0, 0, 0 } }, { "InnerColor", 3, -1, { 1, 0, 0, 0 } },
{ "OuterColor1", 3, -1, { 0, 1, 0, 0 } }, { "OuterColor1", 3, -1, { 0, 1, 0, 0 } },
@ -50,10 +50,10 @@ static struct uniform_info Uniforms[] = {
static GLint win = 0; static GLint win = 0;
static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f; static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f;
static GLint uZoom, uXcenter, uYcenter;
static GLfloat zoom = 1.0, xCenter = -1.5, yCenter = 0.0;
static void static void
@ -61,6 +61,11 @@ Redisplay(void)
{ {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* set interactive uniform parameters */
glUniform1fv_func(uZoom, 1, &zoom);
glUniform1fv_func(uXcenter, 1, &xCenter);
glUniform1fv_func(uYcenter, 1, &yCenter);
glPushMatrix(); glPushMatrix();
glRotatef(xRot, 1.0f, 0.0f, 0.0f); glRotatef(xRot, 1.0f, 0.0f, 0.0f);
glRotatef(yRot, 0.0f, 1.0f, 0.0f); glRotatef(yRot, 0.0f, 1.0f, 0.0f);
@ -75,6 +80,8 @@ Redisplay(void)
glPopMatrix(); glPopMatrix();
glFinish();
glFlush();
glutSwapBuffers(); glutSwapBuffers();
} }
@ -110,10 +117,10 @@ Key(unsigned char key, int x, int y)
switch(key) { switch(key) {
case 'z': case 'z':
zRot -= 1.0; zoom *= 0.9;
break; break;
case 'Z': case 'Z':
zRot += 1.0; zoom /= 0.9;
break; break;
case 27: case 27:
CleanUp(); CleanUp();
@ -127,23 +134,23 @@ Key(unsigned char key, int x, int y)
static void static void
SpecialKey(int key, int x, int y) SpecialKey(int key, int x, int y)
{ {
const GLfloat step = 3.0f; const GLfloat step = 0.1 * zoom;
(void) x; (void) x;
(void) y; (void) y;
switch(key) { switch(key) {
case GLUT_KEY_UP: case GLUT_KEY_UP:
xRot -= step; yCenter += step;
break; break;
case GLUT_KEY_DOWN: case GLUT_KEY_DOWN:
xRot += step; yCenter -= step;
break; break;
case GLUT_KEY_LEFT: case GLUT_KEY_LEFT:
yRot -= step; xCenter -= step;
break; break;
case GLUT_KEY_RIGHT: case GLUT_KEY_RIGHT:
yRot += step; xCenter += step;
break; break;
} }
glutPostRedisplay(); glutPostRedisplay();
@ -268,6 +275,10 @@ Init(void)
} }
} }
uZoom = glGetUniformLocation_func(program, "Zoom");
uXcenter = glGetUniformLocation_func(program, "Xcenter");
uYcenter = glGetUniformLocation_func(program, "Ycenter");
assert(glGetError() == 0); assert(glGetError() == 0);
glClearColor(0.4f, 0.4f, 0.8f, 0.0f); glClearColor(0.4f, 0.4f, 0.8f, 0.0f);