设置sdl_blendmode_blend上的纹理中断渲染质量

发布于 2025-02-06 17:08:58 字数 1145 浏览 1 评论 0原文

我正在尝试创建纹理A，使其透明，然后将纹理b呈现给纹理A。问题是要使纹理成为透明的，我必须首先设置sdl_blendmode_blend the纹理上的打破纹理B渲染的方式。解决问题时，我想对纹理A呈现多种纹理。

纹理B包含一个白色的“新游戏”文本。蓝色背景分别渲染。

这是正确结果的图像，呈现纹理b直接

这是我没有呈现质地的图像设置SDL_BLENDMODE_BLEND。

这是我将渲染纹理a带有设置sdl_blendmode_blend的图像。

我注意到使用sdl_setrenderdrawcolor（r，255，255，255，255，0）;> 如果文本为白色，则纹理b可以正确地呈现，但是当文本为黑色时，它会呈现错误。

    texA = SDL_CreateTexture(r, SDL_PIXELFORMAT_RGBA8888,
                             SDL_TEXTUREACCESS_TARGET,
                             mWidth, mHeight);

    SDL_SetRenderTarget(r, texA);

    // breaks texB rendering, necessary to make texture transparent
    SDL_SetTextureBlendMode(texA, SDL_BLENDMODE_BLEND);

    SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_NONE);
    SDL_SetRenderDrawColor(r, 0, 0, 0, 0);
    SDL_RenderFillRect(r, NULL);

    SDL_RenderCopy(r, texB, NULL, NULL);

    SDL_SetRenderTarget(r, nullptr);

原文

I'm trying to create a texture A, make it transparent, and then render a texture B to the texture A. The problem is that to make the texture A transparent I have to first set SDL_BLENDMODE_BLEND on the texture A, which, sadly, breaks the way the texture B is being rendered. I want to render multiple textures to the texture A, when I resolve the issue.

The texture B contains a white "New Game" text. The blue background is rendered separately.

Here is an image of the correct result, rendering texture B directly

Here is an image of what I get rendering texture A without setting SDL_BLENDMODE_BLEND.

Here is an image of what I get rendering texture A with setting SDL_BLENDMODE_BLEND.

I noticed that when using SDL_SetRenderDrawColor(r, 255, 255, 255, 0); the texture B renders correctly, if the text is white, but it renders incorrectly when the text is black.

    texA = SDL_CreateTexture(r, SDL_PIXELFORMAT_RGBA8888,
                             SDL_TEXTUREACCESS_TARGET,
                             mWidth, mHeight);

    SDL_SetRenderTarget(r, texA);

    // breaks texB rendering, necessary to make texture transparent
    SDL_SetTextureBlendMode(texA, SDL_BLENDMODE_BLEND);

    SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_NONE);
    SDL_SetRenderDrawColor(r, 0, 0, 0, 0);
    SDL_RenderFillRect(r, NULL);

    SDL_RenderCopy(r, texB, NULL, NULL);

    SDL_SetRenderTarget(r, nullptr);

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

离线来电— 2025-02-13 17:08:58

解决方案是创建自定义混合模式。偶然发现了这一点，所以我不确定为什么有效。

texA = SDL_CreateTexture(r, SDL_PIXELFORMAT_RGBA8888,
                         SDL_TEXTUREACCESS_TARGET,
                         mWidth, mHeight);

SDL_SetRenderTarget(r, texA);

const auto bm = SDL_ComposeCustomBlendMode(
                        SDL_BLENDFACTOR_ONE,
                        SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
                        SDL_BLENDOPERATION_ADD,

                        SDL_BLENDFACTOR_ONE,
                        SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
                        SDL_BLENDOPERATION_ADD);
SDL_SetTextureBlendMode(texA, bm);

SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_NONE);
SDL_SetRenderDrawColor(r, 0, 0, 0, 0);
SDL_RenderFillRect(r, NULL);

SDL_RenderCopy(r, texB, NULL, NULL);

SDL_SetRenderTarget(r, nullptr);

The solution was to create a custom blend mode. Figured that out by accident, so I'm not sure why that works.

texA = SDL_CreateTexture(r, SDL_PIXELFORMAT_RGBA8888,
                         SDL_TEXTUREACCESS_TARGET,
                         mWidth, mHeight);

SDL_SetRenderTarget(r, texA);

const auto bm = SDL_ComposeCustomBlendMode(
                        SDL_BLENDFACTOR_ONE,
                        SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
                        SDL_BLENDOPERATION_ADD,

                        SDL_BLENDFACTOR_ONE,
                        SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
                        SDL_BLENDOPERATION_ADD);
SDL_SetTextureBlendMode(texA, bm);

SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_NONE);
SDL_SetRenderDrawColor(r, 0, 0, 0, 0);
SDL_RenderFillRect(r, NULL);

SDL_RenderCopy(r, texB, NULL, NULL);

SDL_SetRenderTarget(r, nullptr);

回复收藏 0 原文

~没有更多了~