update image urls in readme to remove github refs
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README.md
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README.md
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@ -4,7 +4,7 @@
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This is (very) loosely based on David's 3D soft engine in C#/JS: https://www.davrous.com/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript/
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Engine blueprint: a stripped-down version of [https://github.com/wgroeneveld/gba-sprite-engine/](https://github.com/wgroeneveld/gba-sprite-engine/) combined with more _tonc_ library functions.
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Engine blueprint: a stripped-down version of [https://git.brainbaking.com/wgroeneveld/gba-sprite-engine](https://git.brainbaking.com/wgroeneveld/gba-sprite-engine) combined with more _tonc_ library functions.
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### Show me the money!
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@ -12,7 +12,7 @@ Sure thing.
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#### **Demo 1**: without wires
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Camera rotates `2/256` units on x and y each render cycle.
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You 'should' see a cube forming based on 8 vertices. It's a simple example to showcase what the `Mesh` class is about, and how `GBAEngine` handles projections.
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@ -21,12 +21,12 @@ You 'should' see a cube forming based on 8 vertices. It's a simple example to sh
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#### **Demo 1b**: with wires
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A lot less smooth. 20 FPS. I implemented Bresenham somewhat similar to David's approach, without any good results.
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MODE4's weird byte write problems are causing trouble. Time to consult _tonc_ and fix this:
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30 FPS, winning 10 frames using `bmp8_line()`.
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@ -36,7 +36,7 @@ From Blender/Babylon based on [this](https://david.blob.core.windows.net/softeng
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A JS script has been provided that generates the needed C++ code. It's not great, and not very performant.
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2 FPS. Ouch!! This thing has 507 meshes and 968 faces. GLHF! The GBA CPU does not seem to be very happy with that. Like everyone indeed says:
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@ -52,7 +52,7 @@ This is a high-level C++ engine, meaning redundant stack objects could also caus
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The `RasterizerRenderer` class draws triangles as 'fast' as possible, using horizontal scanlines.
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There is a fast way to lines into VRAM. I tried implementing Z-buffering, but the buffer was too big and too slow as z-coords also had to be interpolated...
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At this point, I do not think it's that interesting to go on to texture mapping other than the fun of it. Even with a lot of haxx and tricks, the colored monkey won't ever spin at 30FPS...
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@ -60,13 +60,13 @@ At this point, I do not think it's that interesting to go on to texture mapping
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It did improve performance. I exported a few Babylon meshes, and the octahedron with 8 faces does run at 20FPS compared to 11FPS when back-face culling was implemented (that omits rendering certain faces if z < 0)
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Changing colors indicate certain triangles were not drawn (into the background). It does not help a lot with our monkey, alas. Too many vertices...
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More examples of meshes (box, cylinder, octahedron, sphere, torus) included.
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### GBA-Specific problems
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### GBA-Specific problems
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**Fixed-point math** sums up things nicely.
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