{"id":3787,"date":"2018-02-25T00:26:54","date_gmt":"2018-02-24T16:26:54","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3787"},"modified":"2018-10-14T21:34:09","modified_gmt":"2018-10-14T13:34:09","slug":"opengl_image","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_image\/","title":{"rendered":"OpenGL\u4e4b\u7e6a\u756b\u5716\u50cf\u6587\u6a94"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u7e6a\u756b\u5716\u50cf\u6587\u6a94<\/figcaption><\/figure>\n

\u5728\u5c4f\u5e55\u4e0a\u6e32\u67d3\u5716\u6a94\u8207\u6a21\u578b\u8cbc\u4e0a\u7d0b\u7406\u7e3d\u6703\u4ee4\u4eba\u8208\u596e,\u5e78\u597d\u5728OpengGL\u7e6a\u756b\u5716\u50cf\u6587\u6a94\u4e5f\u4e26\u4e0d\u56f0\u96e3,\u4e26\u4e14\u5be6\u73fe\u5de6\u793a\u4f8b\u7a0b\u5f0f.\u4e0b\u8f09:<\/a><\/p>\n

    \n
  1. \u8f09\u5165\u4e26\u89e3\u91cb\u5716\u50cf\u6587\u6a94\u5982\u300e.bmp<\/a>\u300f\u300e.tga<\/a>\u300f\u300e.pcx<\/a>\u300f<\/li>\n
  2. \u8a2d\u7f6e\u5716\u50cf\u5de6\u4e0b\u89d2\u7e6a\u756b\u5728\u5c4f\u5e55\u4f4d\u7f6eglRasterPos2f(x, y);<\/li>\n
  3. \u8a2d\u7f6e\u5716\u50cf\u7684\u7e2e\u653e\u6bd4glPixelZoom(xfactor,yfactor);\u7e2e\u653e\u56e0\u5b50=\u5c4f\u5e55\u5c3a\u5bf8\/\u5716\u50cf\u5c3a\u5bf8<\/li>\n
  4. \u7e6a\u756b\u5716\u50cfglDrawPixels(width,height,format,type,pixels);\u8207\u300eDirectDraw\u300f\u76f8\u6bd4\u7a0d\u8907\u96dc\u9ede, \u300eDirectDraw\u300f\u652f\u630132Bit\u300116Bit\u3001256\u8272.\u800cOpenGL\u537b\u76f4\u63a5\u652f\u630132Bit\u300124Bit\u3001256\u8272\u3001\u4f46\u8981\u5c07\u50cf\u7d20\u300ePixel\u300f\u5012\u8f49\u6392\u6210RGB\/RGBA\u9806\u5e8f<\/li>\n<\/ol>\n\n\n\n\n\n\n
    Format<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
    GL_RGB<\/td>\n24Bit<\/td>\n<\/tr>\n
    GL_RGBA<\/td>\n32Bit<\/td>\n<\/tr>\n
    GL_COLOR_INDEX<\/td>\n\u8abf\u8272\u677f\u7d22\u5f15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n\n\n\n\n\n
    type<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
    GL_UNSIGNED_BYTE<\/td>\n\u50cf\u7d20\u300ePixel\u300f\u5206\u91cf\u7684\u5c3a\u5bf8<\/td>\n<\/tr>\n
    GL_BITMAP<\/td>\n\u9ede\u9663\u4f4d\u57161\u4f4d\u300eBit\u300f1\u50cf\u7d20\u300ePixel\u300f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n\n\n\n\n\n\n\n
    \u5e38\u898b\u5716\u6a94\u683c\u5f0f\u8b80\u53d6\u8207\u5206\u6790<\/td>\nRLE\u89e3\u78bc<\/td>\n<\/tr>\n
    Bitmap\u6587\u6a94<\/a><\/td>\n8Bit\u7684bitmap\u652f\u6301RLE\u7de8\u78bc<\/a><\/td>\n<\/tr>\n
    Targa\u5716\u6a94<\/a><\/td>\n\u7d22\u5f15\u6a21\u5f0f\u3001RGB\u6a21\u5f0f\u3001\u7070\u5ea6\u6a21\u5f0f\u5747\u652f\u6301RLE\u7de8\u78bc<\/a><\/td>\n<\/tr>\n
    PCX\u5716\u6a94<\/a><\/td>\n8Bit\u7684PCX\u652f\u6301RLE\u7de8\u78bc<\/a><\/td>\n<\/tr>\n
    PNG\u5716\u6a94<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    \u6e32\u67d3\u4f4d\u5716C\u4ee3\u78bc\u6f14\u793a:<\/p>\n

      \n
    1. glPixelStorei(GL_UNPACK_ALIGNMENT, 4);\/\/ 4\u5b57\u7bc0\u5c0d\u9f4a<\/li>\n
    2. glRasterPos2f(x, y);\/\/ \u8a2d\u5b9a\u5716\u50cf\u5de6\u4e0b\u89d2\u5728\u5c4f\u5e55\u7684\u4f4d\u7f6e<\/li>\n
    3. glPixelZoom((float)screen_width\/(float)image_width, (float)screen_height \/ (float)image_height); \/\/ \u8a2d\u7f6e\u5168\u5c4f\u7e2e\u653e<\/li>\n
    4. glDrawPixels(image_width,image_height,format,type,image); \/\/ \u7e6a\u756b<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

      \u5728\u5c4f\u5e55\u4e0a\u6e32\u67d3\u5716\u6a94\u8207\u6a21\u578b\u8cbc\u4e0a\u7d0b\u7406\u7e3d\u6703\u4ee4\u4eba\u8208\u596e,\u5e78\u597d\u5728OpengGL\u7e6a\u756b\u5716\u50cf\u6587\u6a94\u4e5f\u4e26\u4e0d\u56f0\u96e3,\u4e26\u4e14\u5be6\u73fe\u5de6\u793a\u4f8b\u7a0b\u5f0f.\u4e0b … <\/p>\n

      \u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u7e6a\u756b\u5716\u50cf\u6587\u6a94<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[50],"class_list":["post-3787","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/comments?post=3787"}],"version-history":[{"count":8,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3787\/revisions"}],"predecessor-version":[{"id":3987,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3787\/revisions\/3987"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}