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Monogame/HLSL Effect/Shader for Saturn-like graphics.

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Jorhlok:

--- Quote from: corvusd on August 04, 2018, 02:33:28 pm ---Sorry Jorhlok. I totally pass your great contribution!

It is a great project! You have thought about the possibility of adding your real preview of the graphics of the VDP1 to the work of @XL2 to export 3D geometry to SS from Blender 3D.

The possibility of creating 3D graphics in a tool with Blender, and really being able to visualize how the graphics will look. In addition to being able to later export the data to a format as optimized to the machine. It is one of the tasks that remained pending in the past. There were no plugins, or at least I have not seen for 3DS max or others for SS graphics. However for PSX there were many. This facilitated and potentiated taking advantage of both the possibilities of the artist and the machine.

What do you think?

--- End quote ---
I hadn't heard of exporter plugins for the PSX. I'll have to check that out and see what's feasible.

I decided to try storing the quad data in a texture that triangles would then reference in the shader. I'm using a Vector4 format texture so I can store 4 arbitrary floats per pixel. I can use values outside of 0-1. Texture width for this proof of concept is 8 and texture height is the buffer size. The inverse bilinear algorithm doesn't use z values so I left them out. So the first two texels in a row store the quad's coordinates, next two are uv coordinates, next 4 texels are gouraud colors for each corner. I'm sending triangles in with position and uv values. each vertex of a triangle should be the same so the end result makes it to the pixel shader. There, the V coordinate points to the row in the quad buffer. U doesn't do anything but will be options such as sprite vs quad, screendoors, etc.

Here's what it looks like. That strip along the left is the first 240 quads in the last drawn buffer. Values outside of 0-1 are clamped so most of the first two texels just appear as white.


Although the method is a bit unorthodox I'm getting good results compared to last time.

591 kqps depth 8000 buf 1M quad
489 kqps depth 2048 buf 1M quad
288 kqps no depth 8000 buf 1M quad

        /* depth 8000 buf 1M quad
         + 1688.0965
         + 1686.0964
         + 1691.0967
         + 1744.0998
         + 1682.0962
         + 1665.0952
         + 1699.0972
         + 1682.0963
         + 1685.0963
         + 1710.0978
         * avg 1693.29684
         * qps 590563
         * 60fps 9842
         * 30fps 19685
         *
         * depth 2048 buf 1M quad
         + 2060.1178
         + 2058.1177
         + 2043.1169
         + 2053.1175
         + 2031.1161
         + 2032.1162
         + 2042.1168
         + 2043.1169
         + 2071.1185
         + 2021.1156
         * avg 2045.517
         * qps 488873
         * 60fps 8147
         * 30fps 16295
         *
         * no depth 8000 buf 1M quad (disabled depth buffer so it needs to process all the fragments in a triangle)
         + 3495.1999
         + 3487.1994
         + 3428.1961
         + 3482.1992
         + 3469.1984
         + 3461.198
         + 3441.1968
         + 3487.1995
         + 3441.1969
         + 3490.1996
         * avg 3468.29838
         * qps 288325
         * 60fps 4805
         * 30fps 9610
         */

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