OF_FBOMODE_NODEFAULTS doesn't set identity matrices
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 38/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- cpp
- Domain
- computer-graphics
Research direction
Start by tracing the fbo.begin(OF_FBOMODE_NODEFAULTS) and fbo.end() entry points, then inspect how the projection and modelview matrices are handled during the FBO draw. Reproduce the example with ofClear, ofSetColor, and ofDrawRectangle, and compare it with the version using ofLoadIdentityMatrix. Done means the first example produces the stated view and square without manually loading identity matrices.
Written by the indexing model from the issue text.
Description
The below code should create a view from [-1, -1] to [1, 1] and draw a square in the upper right quadrant...
fbo.begin(OF_FBOMODE_NODEFAULTS);
ofClear(0, 255);
ofSetColor(255);
ofDrawRectangle(0, 0, 1, 1);
fbo.end();
However, to get it to actually to actually do that, I needed to explicitly load the identity matrices...
fbo.begin(OF_FBOMODE_NODEFAULTS);
ofSetMatrixMode(OF_MATRIX_PROJECTION);
ofPushMatrix();
ofLoadIdentityMatrix();
ofSetMatrixMode(OF_MATRIX_MODELVIEW);
ofPushMatrix();
ofLoadIdentityMatrix();
ofClear(0, 255);
ofSetColor(255);
ofDrawRectangle(0, 0, 1, 1);
ofSetMatrixMode(OF_MATRIX_PROJECTION);
ofPopMatrix();
ofSetMatrixMode(OF_MATRIX_MODELVIEW);
ofPopMatrix();
fbo.end();
- Dominant language
- C++
- Stars
- 10.4k
- Forks
- 2.6k
- Avg merge
- 1d 21h
- Merged PRs (30d)
- 9
Contributor guide
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