--- /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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "GL/osmesa.h"
+#include "GL/glut.h"
+
+
+#define WIDTH 600
+#define HEIGHT 600
+
+static GLboolean WriteFiles = GL_FALSE;
+static GLboolean Gradient = GL_FALSE;
+
+
+/**
+ * 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 };
+ static const GLfloat yellow_mat[4] = { 0.8, 0.8, 0.0, 1.0 };
+ 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 );
+ glutSolidTorus(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 );
+ glutSolidCone(1.0, 2.0, 16, 1);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(0.75, 0.0, -1.0);
+ glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
+ glutSolidSphere(1.0, 20, 20);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(0.75, 0.0, 1.3);
+ glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, yellow_mat );
+ glutWireTeapot(1.0);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(-0.5, 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 );
+ glutSolidCube(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);
+ return 0;
+ }
+
+ /* sanity checks */
+ glGetIntegerv(GL_RED_BITS, &cBits);
+ assert(cBits == bits);
+ glGetIntegerv(GL_GREEN_BITS, &cBits);
+ assert(cBits == bits);
+ glGetIntegerv(GL_BLUE_BITS, &cBits);
+ assert(cBits == bits);
+ glGetIntegerv(GL_ALPHA_BITS, &cBits);
+ assert(cBits == bits);
+
+ printf("Rendering %d bit/channel image: %s\n", bits, filename);
+
+ 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 = 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 = malloc(WIDTH * HEIGHT * 4);
+ int i;
+ 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);
+
+ return 1;
+}
+
+
+int
+main( int argc, char *argv[] )
+{
+ int i;
+
+ 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;
+}
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