+++ /dev/null
-
-
-#include <assert.h>
-#include <stdio.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-#include <GL/glew.h>
-#include <GL/glu.h>
-#include "readtex.h"
-#include "skybox.h"
-
-
-static int
-load(GLenum target, const char *filename,
- GLboolean flipTB, GLboolean flipLR)
-{
- GLint w, h;
- GLenum format;
- GLubyte *img = LoadRGBImage( filename, &w, &h, &format );
- if (!img) {
- printf("Error: couldn't load texture image %s\n", filename);
- return 0;
- }
- assert(format == GL_RGB);
-
- printf("Load cube face 0x%x: %s %d x %d\n", target, filename, w, h);
-
- /* <sigh> the way the texture cube mapping works, we have to flip
- * images to make things look right.
- */
- if (flipTB) {
- const int stride = 3 * w;
- GLubyte temp[3*1024];
- int i;
- for (i = 0; i < h / 2; i++) {
- memcpy(temp, img + i * stride, stride);
- memcpy(img + i * stride, img + (h - i - 1) * stride, stride);
- memcpy(img + (h - i - 1) * stride, temp, stride);
- }
- }
- if (flipLR) {
- const int stride = 3 * w;
- GLubyte temp[3];
- GLubyte *row;
- int i, j;
- for (i = 0; i < h; i++) {
- row = img + i * stride;
- for (j = 0; j < w / 2; j++) {
- int k = w - j - 1;
- temp[0] = row[j*3+0];
- temp[1] = row[j*3+1];
- temp[2] = row[j*3+2];
- row[j*3+0] = row[k*3+0];
- row[j*3+1] = row[k*3+1];
- row[j*3+2] = row[k*3+2];
- row[k*3+0] = temp[0];
- row[k*3+1] = temp[1];
- row[k*3+2] = temp[2];
- }
- }
- }
-
- gluBuild2DMipmaps(target, GL_RGB, w, h, format, GL_UNSIGNED_BYTE, img);
- free(img);
- return 1;
-}
-
-
-GLuint
-LoadSkyBoxCubeTexture(const char *filePosX,
- const char *fileNegX,
- const char *filePosY,
- const char *fileNegY,
- const char *filePosZ,
- const char *fileNegZ)
-{
- GLuint tex;
-
- glGenTextures(1, &tex);
- glBindTexture(GL_TEXTURE_CUBE_MAP, tex);
-
- glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER,
- GL_LINEAR_MIPMAP_NEAREST);
-
- if (!load(GL_TEXTURE_CUBE_MAP_POSITIVE_X, filePosX, GL_TRUE, GL_TRUE))
- return 0;
- if (!load(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, fileNegX, GL_TRUE, GL_TRUE))
- return 0;
- if (!load(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, filePosY, GL_TRUE, GL_TRUE))
- return 0;
- if (!load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, fileNegY, GL_TRUE, GL_TRUE))
- return 0;
- if (!load(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, filePosZ, GL_TRUE, GL_TRUE))
- return 0;
- if (!load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, fileNegZ, GL_TRUE, GL_TRUE))
- return 0;
-
- return tex;
-}
-
-
-#define eps1 0.99
-#define br 20.0 /* box radius */
-
-void
-DrawSkyBoxCubeTexture(GLuint tex)
-{
- struct vertex {
- float x, y, z, s, t, r;
- };
-
- static const struct vertex verts[24] = {
- /* +X side */
- { br, -br, -br, 1.0, -eps1, -eps1 },
- { br, -br, br, 1.0, -eps1, eps1 },
- { br, br, br, 1.0, eps1, eps1 },
- { br, br, -br, 1.0, eps1, -eps1 },
-
- /* -X side */
- { -br, br, -br, -1.0, eps1, -eps1 },
- { -br, br, br, -1.0, eps1, eps1 },
- { -br, -br, br, -1.0, -eps1, eps1 },
- { -br, -br, -br, -1.0, -eps1, -eps1 },
-
- /* +Y side */
- { br, br, -br, eps1, 1.0, -eps1 },
- { br, br, br, eps1, 1.0, eps1 },
- { -br, br, br, -eps1, 1.0, eps1 },
- { -br, br, -br, -eps1, 1.0, -eps1 },
-
- /* -Y side */
- { -br, -br, -br, -eps1, -1.0, -eps1 },
- { -br, -br, br, -eps1, -1.0, eps1 },
- { br, -br, br, eps1, -1.0, eps1 },
- { br, -br, -br, eps1, -1.0, -eps1 },
-
- /* +Z side */
- { br, -br, br, eps1, -eps1, 1.0 },
- { -br, -br, br, -eps1, -eps1, 1.0 },
- { -br, br, br, -eps1, eps1, 1.0 },
- { br, br, br, eps1, eps1, 1.0 },
-
- /* -Z side */
- { br, br, -br, eps1, eps1, -1.0 },
- { -br, br, -br, -eps1, eps1, -1.0 },
- { -br, -br, -br, -eps1, -eps1, -1.0 },
- { br, -br, -br, eps1, -eps1, -1.0 },
- };
-
- static GLuint vbo = 0;
-
- if (!vbo ) {
- glGenBuffersARB(1, &vbo);
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
- glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts,
- GL_STATIC_DRAW_ARB);
- }
- else {
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
- }
-
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
-
- glVertexPointer(3, GL_FLOAT, sizeof(struct vertex),
- (void *) offsetof(struct vertex, x));
- glTexCoordPointer(3, GL_FLOAT, sizeof(struct vertex),
- (void *) offsetof(struct vertex, s));
- glEnableClientState(GL_VERTEX_ARRAY);
- glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-
- glBindTexture(GL_TEXTURE_CUBE_MAP, tex);
- glEnable(GL_TEXTURE_CUBE_MAP);
-
- glDisable(GL_BLEND);
-
- glDrawArrays(GL_QUADS, 0, 24);
-
- glDisable(GL_TEXTURE_CUBE_MAP);
-
- glDisableClientState(GL_VERTEX_ARRAY);
- glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
-}
-
projects / mesa.git / blobdiff