{"id":208233,"date":"2025-07-08T14:32:52","date_gmt":"2025-07-08T06:32:52","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208233\/"},"modified":"2025-07-08T14:32:52","modified_gmt":"2025-07-08T06:32:52","slug":"blitting-fbo-%e9%a2%9c%e8%89%b2%e9%99%84%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208233\/","title":{"rendered":"Blitting FBO \u989c\u8272\u9644\u4ef6"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Blitting FBO \u989c\u8272\u9644\u4ef6<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-30 16:03:38<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aBlitting FBO \u989c\u8272\u9644\u4ef6\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6709 2 \u4e2a fbo + mrt\uff0c\u5b83\u4eec\u5177\u6709\u76f8\u540c\u7684\u9644\u4ef6\uff08\u6bcf\u4e2a\u6709 4 \u4e2a\u989c\u8272\u9644\u4ef6\uff09\u3002\u5bf9\u4e8e\u6df1\u5ea6\u7f13\u51b2\u533a\u548c one<\/strong> color_attachment\uff0c\u4f7f\u7528 glblitframebuffer \u53ef\u4ee5\u6309\u9884\u671f\u5de5\u4f5c\u3002\u7136\u800c\uff0c\u5f53\u6211\u4f4d\u5757\u590d\u5236\u591a\u4e2a\u989c\u8272\u9644\u4ef6\u65f6\uff0c\u4e8b\u60c5\u5c31\u4f1a\u53d8\u7cdf\u3002\u6211\u505a\u4e86\u5f88\u591a\u7814\u7a76\uff0c\u5c1d\u8bd5\u4e86\u5f88\u591a\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u4f46\u6ca1\u6709\u4e00\u4e2a\u6709\u6548\u3002\u6211\u6ca1\u6709\u4f7f\u7528 renderbufferstorage\uff0c\u56e0\u4e3a\u6211\u7684\u7eb9\u7406\u5177\u6709\u4e0d\u540c\u7684\u5185\u90e8\u683c\u5f0f\uff08rgba \u548c rgb16f\uff09\u3002\u8fd9\u542c\u8d77\u6765\u50cf\u662f\u4e00\u4e2a\u7c7b\u4f3c\u7684\u95ee\u9898\uff0c\u53ea\u662f\u6211\u4e0d\u4f7f\u7528\u591a\u91cd\u91c7\u6837\uff0c\u53ea\u4f7f\u7528 mrt\u3002<\/p>\n

opengl\u7248\u672c4.3<\/p>\n

\u539f\u56e0\uff1a\u6211\u60f3\u521b\u5efa\u5730\u5f62\u9884\u7167\u660e\u8ba1\u7b97\u7684\u72b6\u6001\uff0c\u8fd9\u6837\u6211\u53ea\u9700\u8981\u5728\u53d1\u751f\u53d8\u5316\uff08\u5373\u76f8\u673a\u79fb\u52a8\uff09\u65f6\u6e32\u67d3\u5730\u5f62\uff0c\u7136\u540e\u5c06\u8fd9\u4e9b\u989c\u8272\u9644\u4ef6\u590d\u5236\u5230\u4e0b\u4e00\u4e2a fbo\u3002\u8fd9\u662f\u4e3a\u4e86\u5ef6\u8fdf\u7740\u8272\uff0cfbo \u4e0e gbuffer \u975e\u5e38\u76f8\u4f3c\u3002<\/p>\n

\u8d77\u521d\u6211\u5e0c\u671b\u6211\u5e94\u8be5\u4f7f\u7528\u5728\u521d\u59cb\u8bbe\u7f6e\u4e2d\u4f7f\u7528\u7684 gldrawbuffers\uff0c\u4f46\u662f\u6ca1\u6709 glreadbuffers\uff0c\u56e0\u6b64\u6211\u5047\u8bbe\u6211\u65e0\u6cd5\u94fe\u63a5\u5b83\u4eec\u3002\u6211\u53ef\u80fd\u9519\u4e86\uff0c\u8fd8\u4e0d\u662f\u4e13\u5bb6=)<\/p>\n

\u539f\u59cb\u4ee3\u7801\u662f\u7528 golang \u7f16\u5199\u7684\uff0c\u5e94\u8be5\u53ef\u4ee5\u8f7b\u677e\u8f6c\u79fb\u5230 c++\uff08\u5982\u679c\u9700\u8981\uff0c\u5c06\u8fdb\u884c\u7ffb\u8bd1\uff09\u3002<\/p>\n

\u66f4\u65b0\/\u5df2\u89e3\u51b3\uff1a\u5bf9\u4e8e\u4efb\u4f55\u5076\u7136\u53d1\u73b0\u6b64\u95ee\u9898\u7684\u4eba\u3002\u5f53\u60a8\u4f7f\u7528 gldrawbuffers() \u5e76\u4f7f\u7528\u5bf9 gldrawbuffer() \u7684\u8c03\u7528\u65f6\uff0c\u60a8\u5c06\u8986\u76d6 gldrawbuffers() \u72b6\u6001\u3002\u5b83\u9700\u8981\u91cd\u7f6e\u4e3a\u5176\u539f\u59cb gldrawbuffers() \u72b6\u6001\u3002<\/p>\n

\u66f4\u65b02\uff1a\u5bf9\u4e8e\u90a3\u4e9b\u5bf9\u8fd9\u6837\u7684\u65b9\u6cd5\u611f\u5174\u8da3\u7684\u4eba\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u975e\u52a8\u753b\u4e16\u754c\u5e76\u4e14\u76f8\u673a\u4e0d\u7ecf\u5e38\u79fb\u52a8\uff0c\u6211\u53ef\u4ee5\u786e\u8ba4\u5b83\u5177\u6709\u4ee4\u4eba\u96be\u4ee5\u7f6e\u4fe1\u7684\u6027\u80fd\u7ed3\u679c\u3002\u5c31\u6211\u7684\u76ee\u7684\u800c\u8a00\uff0c\u5b83\u5f88\u68d2\uff08rts\uff09\uff0c\u4f46\u5bf9\u4e8e\u50cf cs \u8fd9\u6837\u7684 fps \u6e38\u620f\u6765\u8bf4\uff0c\u8fd9\u5c06\u662f\u4e00\u4e2a\u975e\u5e38<\/strong>\u7cdf\u7cd5\u7684\u65b9\u6cd5\u3002 <\/p>\n

\u5728\u4f4d\u5757\u4f20\u8f93\u540e\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9\uff08\u5177\u4f53\u60c5\u51b5\uff09\uff1a<\/p>\n

var attachments = [4]uint32{gl.color_attachment0, gl.color_attachment1, gl.color_attachment2, gl.color_attachment3}\ngl.drawbuffers(4, &attachments[0])<\/pre>\n
fbo \u8bbe\u7f6e<\/p>\n
gl.genframebuffers(1, &fbo.id)\ngl.bindframebuffer(gl.framebuffer, fbo.id)\n\n\/\/setting up color attachments\n\ngl.gentextures(1, &fbo.position)\ngl.bindtexture(gl.texture_2d, fbo.position)\ngl.teximage2d(gl.texture_2d, 0, gl.rgb16f, windowwidth, windowheight, 0, gl.rgb, gl.float, nil)\ngl.texparameteri(gl.texture_2d, gl.texture_mag_filter, gl.nearest)\ngl.texparameteri(gl.texture_2d, gl.texture_min_filter, gl.nearest)\ngl.framebuffertexture2d(gl.framebuffer, gl.color_attachment0, gl.texture_2d, fbo.position, 0)\n\n\/\/repeated 3 times for the additional color attachments\n\nvar attachments = [4]uint32{gl.color_attachment0, gl.color_attachment1, gl.color_attachment2, gl.color_attachment3}\ngl.drawbuffers(4, &attachments[0])\n\ngl.genrenderbuffers(1, &fbo.depthbuffer)\ngl.bindrenderbuffer(gl.renderbuffer, fbo.depthbuffer)\ngl.renderbufferstorage(gl.renderbuffer, gl.depth_component, windowwidth, windowheight)\ngl.framebufferrenderbuffer(gl.framebuffer, gl.depth_attachment, gl.renderbuffer, fbo.depthbuffer)\n\ngl.bindframebuffer(gl.framebuffer, 0)<\/pre>\n
\u73b0\u5728\u5230\u4f4d\u5757\u4f20\u9001\u90e8\u5206\u3002<\/p>\n
gl.BindFramebuffer(gl.READ_FRAMEBUFFER, fboIn.ID)\ngl.BindFramebuffer(gl.DRAW_FRAMEBUFFER, fboOut.ID)\n\n\/\/works as expected\ngl.BlitFramebuffer(0, 0, windowWidth, windowHeight, 0, 0, windowWidth, windowHeight, gl.DEPTH_BUFFER_BIT, gl.NEAREST)\n\n\/\/works as expected\ngl.ReadBuffer(gl.COLOR_ATTACHMENT0)\ngl.DrawBuffer(gl.COLOR_ATTACHMENT0)\ngl.BlitFramebuffer(0, 0, windowWidth, windowHeight, 0, 0, windowWidth, windowHeight, gl.COLOR_BUFFER_BIT, gl.LINEAR)\n\n\/\/fails - no errors but produces some weird occurrences. \ngl.ReadBuffer(gl.COLOR_ATTACHMENT1)\ngl.DrawBuffer(gl.COLOR_ATTACHMENT1)\ngl.BlitFramebuffer(0, 0, windowWidth, windowHeight, 0, 0, windowWidth, windowHeight, gl.COLOR_BUFFER_BIT, gl.LINEAR)\n\ngl.BindFramebuffer(gl.FRAMEBUFFER, 0)<\/pre>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
glDrawBuffer(x)<\/code> \u5728\u6982\u5ff5\u4e0a\u7b49\u540c\u4e8e\u8c03\u7528 GLenum bufs[1]={x}; glDrawBuffers(1, bufs)<\/code>.\u7531\u4e8e\u7ed8\u5236\u7f13\u51b2\u533a\u72b6\u6001\u662f FBO \u72b6\u6001\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u6b64\u60a8\u7684\u4f4d\u56fe\u4f20\u9001\u4ee3\u7801\u4f1a\u8986\u76d6\u8fd9\u4e9b\u72b6\u6001\uff0c\u5982\u679c\u4e0d\u624b\u52a8\u6062\u590d\u8fd9\u4e9b\u72b6\u6001\uff0c\u5219\u968f\u540e\u7684\u6e32\u67d3\u5c06\u65e0\u6cd5\u6309\u9884\u671f\u8fdb\u884c\u3002\u5982\u679c\u4f60\u5728\u5faa\u73af\u4e2d\u8c03\u7528\u5b83\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u9519\u8bef\u7684\u7ed3\u8bba\uff0c\u5373\u4f4d\u56fe\u4f20\u8f93\u662f\u95ee\u9898\u6240\u5728\uff0c\u4f46\u5b9e\u9645\u4e0a\uff0c\u4f4d\u56fe\u4f20\u8f93\u5de5\u4f5c\u6b63\u5e38\uff0c\u53ea\u662f\u8f93\u5165\u6570\u636e\u9519\u8bef\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aBlitting FBO \u989c\u8272\u9644\u4ef6\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208233","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208233"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208233\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}