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Replacing glCopyImageSubData

Shawn Halayka · 2022-11-25T18:46:29

I'm currently using glCopyImageSubData to copy from texture to texture. It works fine, but I'm trying to replace it with the following code. It doesn't work, failing on the copy back to the GPU. glCopyImageSubData(glowmap_tex, GL_TEXTURE_2D, 0, 0, 0, 0, last_frame_glowmap_tex, GL_TEXTURE_2D, 0, 0, 0, 0, win_x, win_y, 1); … vector<float> output_pixels(win_x* win_y * 4, 1.0f); glActiveTexture(GL_TEXTURE4); glBindTexture(GL_TEXTURE_2D, glowmap_tex); glBindImageTexture(GL_TEXTURE4, glowmap_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F); glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, &output_pixels[0]); vector<float> last_frame_output_pixels(win_x* win_y * 4, 1.0f); glActiveTexture(GL_TEXTURE4); glBindTexture(GL_TEXTURE_2D, last_frame_glowmap_tex); glBindImageTexture(GL_TEXTURE4, last_frame_glowmap_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F); glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, &last_frame_output_pixels[0]); vector<float> combined_output_pixels(win_x* win_y * 4, 1.0f); for (int x = 0; x < win_x; x++) { for (int y = 0; y < win_y; y++) { size_t index = 4 * ((y * win_x) + x); combined_output_pixels[index + 0] = output_pixels[index + 0];// +last_frame_output_pixels[imgIdx + 0]; combined_output_pixels[index + 1] = output_pixels[index + 1];// +last_frame_output_pixels[imgIdx + 1]; combined_output_pixels[index + 2] = output_pixels[index + 2];// +last_frame_output_pixels[imgIdx + 2]; combined_output_pixels[index + 3] = output_pixels[index + 3];// +last_frame_output_pixels[imgIdx + 3]; } } // The following doesn't work, and I don't know why glActiveTexture(GL_TEXTURE4); glBindTexture(GL_TEXTURE_2D, last_frame_glowmap_tex); glBindImageTexture(4, last_frame_glowmap_tex, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA32F); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, win_x, win_y, 0, GL_RGBA, GL_FLOAT, &combined_output_pixels[0]); Any ideas?

Graphics and GPU Programming Programming OpenGL C++ texture

Started by taby November 23, 2022 11:24 PM

22 comments, last by taby 1 year, 7 months ago

taby

1,511

Author

November 25, 2022 06:24 PM

huh?

JoeJ

4,265

November 25, 2022 06:30 PM

Geri said:
me, as the person who introduced you to the glCopyImageSubData function: why you replaced it?

He's still using it. Now i'm confused by topic title too, but guess it's mainly about how to do the accumulation, which the copy can not do.

taby

1,511

Author

November 25, 2022 06:46 PM

Sorry, I didn't mean to confuse anyone. I still rely on glCopyImageSubData. I just replaced a simple copy with addition, which at the end, still requires a copy from texture to texture. Sorry to confuse.

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Replacing glCopyImageSubData

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🎉 Celebrating 25 Years of GameDev.net! 🎉

Replacing glCopyImageSubData

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