ref: b0e4642366a76e49553afa9947715ba0cc0c07a6
dir: /src/texture.c/
/* * Texture Manager */ #include "zgl.h" static GLTexture* find_texture(GLContext* c, GLint h) { GLTexture* t; t = c->shared_state.texture_hash_table[h % TEXTURE_HASH_TABLE_SIZE]; while (t != NULL) { if (t->handle == h) return t; t = t->next; } return NULL; } void* glGetTexturePixmap(GLint text, GLint level, GLint* xsize, GLint* ysize) { GLTexture* tex; GLContext* c = gl_get_context(); assert(text >= 0 && level < MAX_TEXTURE_LEVELS); tex = find_texture(c, text); if (!tex) return NULL; *xsize = tex->images[level].xsize; *ysize = tex->images[level].ysize; return tex->images[level].pixmap; } static void free_texture(GLContext* c, GLint h) { GLTexture *t, **ht; GLImage* im; GLint i; t = find_texture(c, h); if (t->prev == NULL) { ht = &c->shared_state.texture_hash_table[t->handle % TEXTURE_HASH_TABLE_SIZE]; *ht = t->next; } else { t->prev->next = t->next; } if (t->next != NULL) t->next->prev = t->prev; for (i = 0; i < MAX_TEXTURE_LEVELS; i++) { im = &t->images[i]; if (im->pixmap != NULL) gl_free(im->pixmap); } gl_free(t); } GLTexture* alloc_texture(GLContext* c, GLint h) { GLTexture *t, **ht; t = gl_zalloc(sizeof(GLTexture)); ht = &c->shared_state.texture_hash_table[h % TEXTURE_HASH_TABLE_SIZE]; t->next = *ht; t->prev = NULL; if (t->next != NULL) t->next->prev = t; *ht = t; t->handle = h; return t; } void glInitTextures(GLContext* c) { /* textures */ c->texture_2d_enabled = 0; c->current_texture = find_texture(c, 0); } void glGenTextures(GLint n, GLuint* textures) { GLContext* c = gl_get_context(); GLint max, i; GLTexture* t; max = 0; for (i = 0; i < TEXTURE_HASH_TABLE_SIZE; i++) { t = c->shared_state.texture_hash_table[i]; while (t != NULL) { if (t->handle > max) max = t->handle; t = t->next; } } for (i = 0; i < n; i++) { textures[i] = max + i + 1; } } void glDeleteTextures(GLint n, const GLuint* textures) { GLContext* c = gl_get_context(); GLint i; GLTexture* t; for (i = 0; i < n; i++) { t = find_texture(c, textures[i]); if (t != NULL && t != 0) { if (t == c->current_texture) { glBindTexture(GL_TEXTURE_2D, 0); } free_texture(c, textures[i]); } } } void glopBindTexture(GLContext* c, GLParam* p) { GLint target = p[1].i; GLint texture = p[2].i; GLTexture* t; assert(target == GL_TEXTURE_2D && texture >= 0); t = find_texture(c, texture); if (t == NULL) { t = alloc_texture(c, texture); } c->current_texture = t; } void glopTexImage2D(GLContext* c, GLParam* p) { GLint target = p[1].i; GLint level = p[2].i; GLint components = p[3].i; GLint width = p[4].i; GLint height = p[5].i; GLint border = p[6].i; GLint format = p[7].i; GLint type = p[8].i; void* pixels = p[9].p; GLImage* im; GLubyte* pixels1; GLint do_free; if (!(target == GL_TEXTURE_2D && level == 0 && components == 3 && border == 0 && format == GL_RGB && type == GL_UNSIGNED_BYTE)) { gl_fatal_error("glTexImage2D: combination of parameters not handled!!"); } do_free = 0; if (width != 256 || height != 256) { pixels1 = gl_malloc(256 * 256 * 3); /* no GLinterpolation is done here to respect the original image aliasing ! */ gl_resizeImageNoInterpolate(pixels1, 256, 256, pixels, width, height); do_free = 1; width = 256; height = 256; } else { pixels1 = pixels; } im = &c->current_texture->images[level]; im->xsize = width; im->ysize = height; if (im->pixmap != NULL) gl_free(im->pixmap); #if TGL_FEATURE_RENDER_BITS == 24 im->pixmap = gl_malloc(width * height * 3); if (im->pixmap) { memcpy(im->pixmap, pixels1, width * height * 3); } #elif TGL_FEATURE_RENDER_BITS == 32 im->pixmap = gl_malloc(width * height * 4); if (im->pixmap) { gl_convertRGB_to_8A8R8G8B(im->pixmap, pixels1, width, height); } #elif TGL_FEATURE_RENDER_BITS == 16 im->pixmap = gl_malloc(width * height * 2); if (im->pixmap) { gl_convertRGB_to_5R6G5B(im->pixmap, pixels1, width, height); } #else #error TODO #endif if (do_free) gl_free(pixels1); } /* TODO: not all tests are done */ void glopTexEnv(GLContext* c, GLParam* p) { GLint target = p[1].i; GLint pname = p[2].i; GLint param = p[3].i; if (target != GL_TEXTURE_ENV) { error: gl_fatal_error("glTexParameter: unsupported option"); } if (pname != GL_TEXTURE_ENV_MODE) goto error; if (param != GL_DECAL) goto error; } /* TODO: not all tests are done */ void glopTexParameter(GLContext* c, GLParam* p) { GLint target = p[1].i; GLint pname = p[2].i; GLint param = p[3].i; if (target != GL_TEXTURE_2D) { error: gl_fatal_error("glTexParameter: unsupported option"); } switch (pname) { case GL_TEXTURE_WRAP_S: case GL_TEXTURE_WRAP_T: if (param != GL_REPEAT) goto error; break; } } void glopPixelStore(GLContext* c, GLParam* p) { GLint pname = p[1].i; GLint param = p[2].i; if (pname != GL_UNPACK_ALIGNMENT || param != 1) { gl_fatal_error("glPixelStore: unsupported option"); } }