+++ /dev/null
-/*
- * Test OSMesa interface at 8, 16 and 32 bits/channel.
- *
- * Usage: osdemo [options]
- *
- * Options:
- * -f generate image files
- * -g render gradient and print color values
- */
-
-#include <assert.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "GL/osmesa.h"
-#include "GL/glu.h"
-
-
-#define WIDTH 600
-#define HEIGHT 600
-
-static GLboolean WriteFiles = GL_FALSE;
-static GLboolean Gradient = GL_FALSE;
-
-
-static void
-Sphere(float radius, int slices, int stacks)
-{
- GLUquadric *q = gluNewQuadric();
- gluQuadricNormals(q, GLU_SMOOTH);
- gluSphere(q, radius, slices, stacks);
- gluDeleteQuadric(q);
-}
-
-
-static void
-Cone(float base, float height, int slices, int stacks)
-{
- GLUquadric *q = gluNewQuadric();
- gluQuadricDrawStyle(q, GLU_FILL);
- gluQuadricNormals(q, GLU_SMOOTH);
- gluCylinder(q, base, 0.0, height, slices, stacks);
- gluDeleteQuadric(q);
-}
-
-
-static void
-Torus(float innerRadius, float outerRadius, int sides, int rings)
-{
- /* from GLUT... */
- int i, j;
- GLfloat theta, phi, theta1;
- GLfloat cosTheta, sinTheta;
- GLfloat cosTheta1, sinTheta1;
- const GLfloat ringDelta = 2.0 * M_PI / rings;
- const GLfloat sideDelta = 2.0 * M_PI / sides;
-
- theta = 0.0;
- cosTheta = 1.0;
- sinTheta = 0.0;
- for (i = rings - 1; i >= 0; i--) {
- theta1 = theta + ringDelta;
- cosTheta1 = cos(theta1);
- sinTheta1 = sin(theta1);
- glBegin(GL_QUAD_STRIP);
- phi = 0.0;
- for (j = sides; j >= 0; j--) {
- GLfloat cosPhi, sinPhi, dist;
-
- phi += sideDelta;
- cosPhi = cos(phi);
- sinPhi = sin(phi);
- dist = outerRadius + innerRadius * cosPhi;
-
- glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
- glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, innerRadius * sinPhi);
- glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
- glVertex3f(cosTheta * dist, -sinTheta * dist, innerRadius * sinPhi);
- }
- glEnd();
- theta = theta1;
- cosTheta = cosTheta1;
- sinTheta = sinTheta1;
- }
-}
-
-
-static void Cube(float size)
-{
- size = 0.5 * size;
-
- glBegin(GL_QUADS);
- /* +X face */
- glNormal3f(1, 0, 0);
- glVertex3f(size, -size, size);
- glVertex3f(size, -size, -size);
- glVertex3f(size, size, -size);
- glVertex3f(size, size, size);
-
- /* -X face */
- glNormal3f(-1, 0, 0);
- glVertex3f(-size, size, size);
- glVertex3f(-size, size, -size);
- glVertex3f(-size, -size, -size);
- glVertex3f(-size, -size, size);
-
- /* +Y face */
- glNormal3f(0, 1, 0);
- glVertex3f(-size, size, size);
- glVertex3f( size, size, size);
- glVertex3f( size, size, -size);
- glVertex3f(-size, size, -size);
-
- /* -Y face */
- glNormal3f(0, -1, 0);
- glVertex3f(-size, -size, -size);
- glVertex3f( size, -size, -size);
- glVertex3f( size, -size, size);
- glVertex3f(-size, -size, size);
-
- /* +Z face */
- glNormal3f(0, 0, 1);
- glVertex3f(-size, -size, size);
- glVertex3f( size, -size, size);
- glVertex3f( size, size, size);
- glVertex3f(-size, size, size);
-
- /* -Z face */
- glNormal3f(0, 0, -1);
- glVertex3f(-size, size, -size);
- glVertex3f( size, size, -size);
- glVertex3f( size, -size, -size);
- glVertex3f(-size, -size, -size);
-
- glEnd();
-}
-
-
-
-/**
- * Draw red/green gradient across bottom of image.
- * Read pixels to check deltas.
- */
-static void
-render_gradient(void)
-{
- GLfloat row[WIDTH][4];
- int i;
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(-1, 1, -1, 1, -1, 1);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- glBegin(GL_POLYGON);
- glColor3f(1, 0, 0);
- glVertex2f(-1, -1.0);
- glVertex2f(-1, -0.9);
- glColor3f(0, 1, 0);
- glVertex2f(1, -0.9);
- glVertex2f(1, -1.0);
- glEnd();
- glFinish();
-
- glReadPixels(0, 0, WIDTH, 1, GL_RGBA, GL_FLOAT, row);
- for (i = 0; i < 4; i++) {
- printf("row[i] = %f, %f, %f\n", row[i][0], row[i][1], row[i][2]);
- }
-}
-
-
-static void
-render_image(void)
-{
- static const GLfloat light_ambient[4] = { 0.0, 0.0, 0.0, 1.0 };
- static const GLfloat light_diffuse[4] = { 1.0, 1.0, 1.0, 1.0 };
- static const GLfloat light_specular[4] = { 1.0, 1.0, 1.0, 1.0 };
- static const GLfloat light_position[4] = { 1.0, 1.0, 1.0, 0.0 };
- static const GLfloat red_mat[4] = { 1.0, 0.2, 0.2, 1.0 };
- static const GLfloat green_mat[4] = { 0.2, 1.0, 0.2, 1.0 };
- static const GLfloat blue_mat[4] = { 0.2, 0.2, 1.0, 1.0 };
-#if 0
- static const GLfloat yellow_mat[4] = { 0.8, 0.8, 0.0, 1.0 };
-#endif
- static const GLfloat purple_mat[4] = { 0.8, 0.4, 0.8, 0.6 };
-
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
-
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHT0);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-1.0, 1.0, -1.0, 1.0, 2.0, 50.0);
- glMatrixMode(GL_MODELVIEW);
- glTranslatef(0, 0.5, -7);
-
- glClearColor(0.3, 0.3, 0.7, 0.0);
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- glPushMatrix();
- glRotatef(20.0, 1.0, 0.0, 0.0);
-
- /* ground */
- glEnable(GL_TEXTURE_2D);
- glBegin(GL_POLYGON);
- glNormal3f(0, 1, 0);
- glTexCoord2f(0, 0); glVertex3f(-5, -1, -5);
- glTexCoord2f(1, 0); glVertex3f( 5, -1, -5);
- glTexCoord2f(1, 1); glVertex3f( 5, -1, 5);
- glTexCoord2f(0, 1); glVertex3f(-5, -1, 5);
- glEnd();
- glDisable(GL_TEXTURE_2D);
-
- glEnable(GL_LIGHTING);
-
- glPushMatrix();
- glTranslatef(-1.5, 0.5, 0.0);
- glRotatef(90.0, 1.0, 0.0, 0.0);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
- Torus(0.275, 0.85, 20, 20);
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef(-1.5, -0.5, 0.0);
- glRotatef(270.0, 1.0, 0.0, 0.0);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
- Cone(1.0, 2.0, 16, 1);
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef(0.95, 0.0, -0.8);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
- glLineWidth(2.0);
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- Sphere(1.2, 20, 20);
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- glPopMatrix();
-
-#if 0
- glPushMatrix();
- glTranslatef(0.75, 0.0, 1.3);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, yellow_mat );
- glutWireTeapot(1.0);
- glPopMatrix();
-#endif
-
- glPushMatrix();
- glTranslatef(-0.25, 0.0, 2.5);
- glRotatef(40, 0, 1, 0);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glEnable(GL_BLEND);
- glEnable(GL_CULL_FACE);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, purple_mat );
- Cube(1.0);
- glDisable(GL_BLEND);
- glDisable(GL_CULL_FACE);
- glPopMatrix();
-
- glDisable(GL_LIGHTING);
-
- glPopMatrix();
-
- glDisable(GL_DEPTH_TEST);
-}
-
-
-static void
-init_context(void)
-{
- const GLint texWidth = 64, texHeight = 64;
- GLubyte *texImage;
- int i, j;
-
- /* checker image */
- texImage = malloc(texWidth * texHeight * 4);
- for (i = 0; i < texHeight; i++) {
- for (j = 0; j < texWidth; j++) {
- int k = (i * texWidth + j) * 4;
- if ((i % 5) == 0 || (j % 5) == 0) {
- texImage[k+0] = 200;
- texImage[k+1] = 200;
- texImage[k+2] = 200;
- texImage[k+3] = 255;
- }
- else {
- if ((i % 5) == 1 || (j % 5) == 1) {
- texImage[k+0] = 50;
- texImage[k+1] = 50;
- texImage[k+2] = 50;
- texImage[k+3] = 255;
- }
- else {
- texImage[k+0] = 100;
- texImage[k+1] = 100;
- texImage[k+2] = 100;
- texImage[k+3] = 255;
- }
- }
- }
- }
-
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, texImage);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-
- free(texImage);
-}
-
-
-static void
-write_ppm(const char *filename, const GLubyte *buffer, int width, int height)
-{
- const int binary = 0;
- FILE *f = fopen( filename, "w" );
- if (f) {
- int i, x, y;
- const GLubyte *ptr = buffer;
- if (binary) {
- fprintf(f,"P6\n");
- fprintf(f,"# ppm-file created by osdemo.c\n");
- fprintf(f,"%i %i\n", width,height);
- fprintf(f,"255\n");
- fclose(f);
- f = fopen( filename, "ab" ); /* reopen in binary append mode */
- for (y=height-1; y>=0; y--) {
- for (x=0; x<width; x++) {
- i = (y*width + x) * 4;
- fputc(ptr[i], f); /* write red */
- fputc(ptr[i+1], f); /* write green */
- fputc(ptr[i+2], f); /* write blue */
- }
- }
- }
- else {
- /*ASCII*/
- int counter = 0;
- fprintf(f,"P3\n");
- fprintf(f,"# ascii ppm file created by osdemo.c\n");
- fprintf(f,"%i %i\n", width, height);
- fprintf(f,"255\n");
- for (y=height-1; y>=0; y--) {
- for (x=0; x<width; x++) {
- i = (y*width + x) * 4;
- fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
- counter++;
- if (counter % 5 == 0)
- fprintf(f, "\n");
- }
- }
- }
- fclose(f);
- }
-}
-
-
-static GLboolean
-test(GLenum type, GLint bits, const char *filename)
-{
- const GLint z = 16, stencil = 0, accum = 0;
- OSMesaContext ctx;
- void *buffer;
- GLint cBits;
-
- assert(bits == 8 ||
- bits == 16 ||
- bits == 32);
-
- assert(type == GL_UNSIGNED_BYTE ||
- type == GL_UNSIGNED_SHORT ||
- type == GL_FLOAT);
-
- ctx = OSMesaCreateContextExt(OSMESA_RGBA, z, stencil, accum, NULL );
- if (!ctx) {
- printf("OSMesaCreateContextExt() failed!\n");
- return 0;
- }
-
- /* Allocate the image buffer */
- buffer = malloc(WIDTH * HEIGHT * 4 * bits / 8);
- if (!buffer) {
- printf("Alloc image buffer failed!\n");
- return 0;
- }
-
- /* Bind the buffer to the context and make it current */
- if (!OSMesaMakeCurrent( ctx, buffer, type, WIDTH, HEIGHT )) {
- printf("OSMesaMakeCurrent (%d bits/channel) failed!\n", bits);
- free(buffer);
- OSMesaDestroyContext(ctx);
- return 0;
- }
-
- /* sanity checks */
- glGetIntegerv(GL_RED_BITS, &cBits);
- if (cBits != bits) {
- fprintf(stderr, "Unable to create %d-bit/channel renderbuffer.\n", bits);
- fprintf(stderr, "May need to recompile Mesa with CHAN_BITS=16 or 32.\n");
- return 0;
- }
- glGetIntegerv(GL_GREEN_BITS, &cBits);
- assert(cBits == bits);
- glGetIntegerv(GL_BLUE_BITS, &cBits);
- assert(cBits == bits);
- glGetIntegerv(GL_ALPHA_BITS, &cBits);
- assert(cBits == bits);
-
- if (WriteFiles)
- printf("Rendering %d bit/channel image: %s\n", bits, filename);
- else
- printf("Rendering %d bit/channel image\n", bits);
-
- OSMesaColorClamp(GL_TRUE);
-
- init_context();
- render_image();
- if (Gradient)
- render_gradient();
-
- /* Make sure buffered commands are finished! */
- glFinish();
-
-
- if (WriteFiles && filename != NULL) {
- if (type == GL_UNSIGNED_SHORT) {
- GLushort *buffer16 = (GLushort *) buffer;
- GLubyte *buffer8 = (GLubyte *) malloc(WIDTH * HEIGHT * 4);
- int i;
- for (i = 0; i < WIDTH * HEIGHT * 4; i++)
- buffer8[i] = buffer16[i] >> 8;
- write_ppm(filename, buffer8, WIDTH, HEIGHT);
- free(buffer8);
- }
- else if (type == GL_FLOAT) {
- GLfloat *buffer32 = (GLfloat *) buffer;
- GLubyte *buffer8 = (GLubyte *) malloc(WIDTH * HEIGHT * 4);
- int i;
- /* colors may be outside [0,1] so we need to clamp */
- for (i = 0; i < WIDTH * HEIGHT * 4; i++)
- buffer8[i] = (GLubyte) (buffer32[i] * 255.0);
- write_ppm(filename, buffer8, WIDTH, HEIGHT);
- free(buffer8);
- }
- else {
- write_ppm(filename, buffer, WIDTH, HEIGHT);
- }
- }
-
- OSMesaDestroyContext(ctx);
-
- free(buffer);
-
- return 1;
-}
-
-
-int
-main( int argc, char *argv[] )
-{
- int i;
-
- printf("Use -f to write image files\n");
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-f") == 0)
- WriteFiles = GL_TRUE;
- else if (strcmp(argv[i], "-g") == 0)
- Gradient = GL_TRUE;
- }
-
- test(GL_UNSIGNED_BYTE, 8, "image8.ppm");
- test(GL_UNSIGNED_SHORT, 16, "image16.ppm");
- test(GL_FLOAT, 32, "image32.ppm");
-
- return 0;
-}
projects / mesa.git / blobdiff