diff options
| -rw-r--r-- | src/mesa/main/teximage.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c index 616a92953e7..5af0a2ec198 100644 --- a/src/mesa/main/teximage.c +++ b/src/mesa/main/teximage.c @@ -3484,6 +3484,24 @@ formats_differ_in_component_sizes(mesa_format f1, mesa_format f2) return GL_FALSE; } +static bool +can_avoid_reallocation(struct gl_texture_image *texImage, GLenum internalFormat, + mesa_format texFormat, GLint x, GLint y, GLsizei width, + GLsizei height, GLint border) +{ + if (texImage->InternalFormat != internalFormat) + return false; + if (texImage->TexFormat != texFormat) + return false; + if (texImage->Border != border) + return false; + if (texImage->Width2 != width) + return false; + if (texImage->Height2 != height) + return false; + return true; +} + /** * Implement the glCopyTexImage1/2D() functions. */ @@ -3527,6 +3545,24 @@ copyteximage(struct gl_context *ctx, GLuint dims, texFormat = _mesa_choose_texture_format(ctx, texObj, target, level, internalFormat, GL_NONE, GL_NONE); + /* First check if reallocating the texture buffer can be avoided. + * Without the realloc the copy can be 20x faster. + */ + _mesa_lock_texture(ctx, texObj); + { + texImage = _mesa_select_tex_image(texObj, target, level); + if (texImage && can_avoid_reallocation(texImage, internalFormat, texFormat, + x, y, width, height, border)) { + _mesa_unlock_texture(ctx, texObj); + return _mesa_copy_texture_sub_image(ctx, dims, texObj, target, level, + 0, 0, 0, x, y, width, height, + "CopyTexImage"); + } + } + _mesa_unlock_texture(ctx, texObj); + _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_LOW, "glCopyTexImage " + "can't avoid reallocating texture storage\n"); + rb = _mesa_get_read_renderbuffer_for_format(ctx, internalFormat); if (_mesa_is_gles3(ctx)) { |