Ian Curtis
c40d6ac17b
Rewrite the stencil buffer usage slightly, so both the LOS and layered polys work. LOS uses the top bit of the stencil buffer. Fixes some minor issues with draw order in sega rally.
2023-11-10 19:13:37 +00:00
Ian Curtis
8dda8e9105
Fix the line of sight function.
...
Polygons have a line of sight value that's either a 0 or 1. We write this value into the stencil buffer, then read the app can read it back to determine the polygon attribute is visible or not. The returned value is 1/depth value in world coordinates. The first bit of the float is actually a control bit, 1 indicates no geometry hit, 0 indicates geometry hit.
2023-11-03 13:24:59 +00:00
Ian Curtis
6595b9320e
Rewrite the renderer a bit to spit out the finished graphics from the 3d chip on separate buffers. One buffer is for opaque pixels, and 2 more for translucent pixels. Before the frame was composited on the back buffer, which meant the tilegen had to have been drawn first. This way the images are now totally independant of the tilegen chip so can be drawn as soon as the register write 0xC is written to the tilegen.
...
Some games update the tilegen after the ping_ping bit has flipped at 66% of the frame, so we need to split the tilegen drawing up into two stages to get some effects to work. So having the tilegen draw independantly of the 3d chip can make this happen.
2023-10-14 20:05:00 +01:00
Ian Curtis
40c8259130
Rewrite the whole project for GL4+. I figured if we removed the limitation of a legacy rendering API we could improve things a bit. With GL4+ we can do unsigned integer math in the shaders. This allows us to upload a direct copy of the real3d texture sheet, and texture directly from this memory given the x/y pos and type. This massively simplifies the binding and invalidation code. Also the crazy corner cases will work because it essentially works the same way as the original hardware.
...
The standard triangle render requires gl 4.1 core, so should work on mac. The quad renderer runs on 4.5 core. The legacy renderer should still work, and when enabled a regular opengl context will be created, which allows functions marked depreciated in the core profiles to still work. This will only work in windows/linux I think. Apple doesn't support this.
A GL 4.1 GPU is now the min required spec. Sorry if you have an OLDER gpu. GL 4.1 is over 12 years old now.
This is a big update so I apologise in advance if I accidently broke something :]
2022-11-07 21:33:01 +00:00
toxieainc
4961951a89
fix a real error (m68kdasm) and some harmless performance warnings and use modern headers
2022-07-11 18:10:41 +02:00
Ian Curtis
6f6c98c671
The translator map seems to work with paletted colour values too, and the result is not clamped. Colours are passed to the GPU as unsigned bytes to multiplying by 16 will overflow, so we do the logic in the shader. If we passed floats we could skip the shader logic.
2020-05-11 09:05:46 +00:00
Ian Curtis
8094c2e2b7
Composite the alpha layers at the end of rendering. To do this we need to mask the alpha pixels with the opaque pixels from the next priority layer. Fixes some overlapping shadows in vf3tb that have different priority layers. I assume that was a game bug, but it works on the real h/w.
2019-01-21 14:30:42 +00:00
Ian Curtis
3eeec35e7c
Correctly emulate the real3d pro-1000 texture modes in our shader.
2018-10-13 13:29:45 +00:00
Ian Curtis
b5f9ad9651
Quad rendering engine. Set QuadRendering = 1 in the ini file to use, or -quad-rendering at the end of the command line to use.
2018-09-13 12:50:34 +00:00
Ian Curtis
c1c2dedcfa
remove dead variable
2018-08-09 21:57:51 +00:00
Ian Curtis
c7ffd0a808
Draw transparent polys to separate layers and composite at the end. This solves a tonne of transparency errors we had been battling with for a long time. The model3 is strange in the fact it only supports a max of two translucent overlapped polys. They are not blended into the frame normally. Doing this means the topmost translucent polys only are visible in the scene, the equivalent of doing a depth pass first, but without the added cost.
2018-06-16 21:31:29 +00:00
Ian Curtis
c6b86c0812
Render the opaque part of texture transparency in the first pass. Fixes numerous transparency related issues in lemans24 and some in ocean hunter. I don't really know if this is the 'correct' way of solving this because the real3d pro-1000 is a complete black box. There is still a lot we don't understand about how it handles transparency.
2018-05-02 20:10:02 +00:00
Ian Curtis
b184ca3e1b
Clamping must be applied before the spotlight is applied on step 1.0 h/w.
2018-03-10 09:13:28 +00:00
Ian Curtis
99b5b9ba1b
make the logic a bit clearer
2018-01-15 14:40:59 +00:00
Ian Curtis
a1350d95a2
Update microtexture coordinate logic (Harry Tuttle)
2018-01-14 12:56:24 +00:00
Ian Curtis
62d9584b0d
Shift fog maths to fragment shader to fix bug in virtua on.
2017-11-23 17:51:51 +00:00
Ian Curtis
bddc86aba9
The vertex shader is run before clipping is done. If fogging values are calculated and clamped in the vertex shader it can interpolate bad values, since the range has been truncated. This happens if the polys overlap the near plane. The solution to clamp the values in the fragment shader. This fixes a bunch of fogging errors I long thought were transparency related errors in the ocean hunter.
2017-11-20 22:21:15 +00:00
Ian Curtis
df44ad458b
Update step 1.5 luminous logic with Harry's findings. Fixes various shading issues.
2017-11-05 13:25:33 +00:00
Ian Curtis
7f6df0cc84
Remove fixed shading check from specular.
2017-10-07 12:39:30 +00:00
Ian Curtis
43cf6b3bbf
update spotlight code (Harry Tuttle)
2017-10-05 18:49:08 +00:00
Ian Curtis
a3e2fb7906
Calculating the length of the vertex results in quite broken values for fogging when the vertices are traversing the view frustum. The hardware also wouldn't have been doing a square root per vertex for fogging. Simply using the z values is enough. Todo check clamping of values for the near/far planes.
2017-09-06 13:07:39 +00:00
Ian Curtis
266c911133
Optimise vertex data to cut down on unnecessary copying
2017-08-30 21:45:25 +00:00
Ian Curtis
165926aa06
Modern hardware does backface culling in window space by calculating the face normal for the polygon, then doing a dot product against the view vector. The real3d pro-1000 on the other hand passes a pre-calculated face normal for each polygon which is used for culling. We were using this face normal to rewind the polygons so that regular backface culling would work. This worked 99.9% of the time. However this was failing on some models in Virtua Striker. The reason was because the pre-calculated face normals being passed were actually completely different to the actual face normals for the poly (not just inverted like you would expect). This broke our code. The solution was to emulate face culling directly in the vertex shader using the pre-calculated face normals directly. Only minimally tested this but hopefully there are no obvious regressions.
2017-08-29 10:27:29 +00:00
Ian Curtis
50d1f95648
Changed fixed shaded logic for step 1.5 hw based upon Harry's findings
2017-08-25 22:40:39 +00:00
Ian Curtis
cd5978773a
Harry made some important discoveries with regards to fixed shading on the model 3 (per vertex poly brightness values). Firstly values are allowed to be negative, and they are used as a drop in replacement in the standard lighting equation for the normal dot light vector. This quite radically changes the brightness in LA Machine guns, but now correctly matches the arcade.
2017-08-19 20:06:31 +00:00
Ian Curtis
0efd4dac39
Finish fixed shading for 2.0 hardware. I'm pretty sure it actually works identically to step 1.5 hardware. The oddball is LA machine guns where the viewport ambient doesn't seem to effect the brightness. But the ambient works differently in this game because it uses the unclamped light model. Still need to investigate if the diffuse factor effects fixed shading.
2017-08-15 23:21:57 +00:00
Ian Curtis
b1cc9a615d
With fixed shading, when lighting is disabled, fixed shading appears to be a flat shaded version based upon the poly colour, instead of per vertex attributes.
2017-08-15 20:50:36 +00:00
Ian Curtis
eac76f0908
simplify
2017-08-14 23:30:34 +00:00
Ian Curtis
81188bee07
fixed shading doesn't effect the alpha channel
2017-08-14 16:10:26 +00:00
Ian Curtis
c12e4c3215
Fixed shading (per vertex poly colours) on step 1.5 hardware have the viewport ambient value added to them. This fixes various shading on scud. To do this had to switch the maths to the vertex shader.
2017-08-14 09:14:06 +00:00
Ian Curtis
8f622714a7
Fix attribute locations. glBindAttribLocation must be called linking
2017-08-11 11:59:41 +00:00
Bart Trzynadlowski
a315627401
Added support for loading shaders from files for new engine and tile renderer. Changed help text to reflect new engine being default.
2017-08-11 00:41:10 +00:00
Ian Curtis
d7403afda6
use generic vertex attributes
2017-08-10 15:43:03 +00:00
Ian Curtis
57d0a513fd
Technically matrix casts are only allowed in glsl 1.2 and later
2017-08-09 23:25:01 +00:00
Ian Curtis
5709ee2659
Sometime ago I managed to work out that specular on the model3 is not real specular, and really is just an extension of diffuse lighting. But attempts were derailed by corner cases and the fact we were not handling the normals correctly. Anyway Harry managed to successfully come up with an algorithm, and coefficients that give an almost perfect match to specular on the model3, based soley on observations from video footage! He also worked out that the lighting on hardware 1.5 onwards appears to be unclamped (ie greater than 1). This quite radically changes the brightness of some of the games, but much better matches the original hardware.
2017-08-09 16:56:56 +00:00
Ian Curtis
1d338877fc
cosmetic
2017-08-03 11:05:04 +00:00
Ian Curtis
3fc28159eb
Add the unclamped light model we know exists to the shaders.
2017-08-03 10:41:18 +00:00
Ian Curtis
9aa3f13777
We were force normalising the result of matrix * normal, which looked correct in most cases. But this didn't preserve the scaling of the matrix, or the scaling of the model normals which resulted in many over bright areas. On it's own this generally worked, but games like Star Wars looked quite broken. Harry correctly figured out if you scale these normals by the scaling value that is sometimes present in the culling nodes the lighting looks correct. Still more work to do to correctly figure out the model3's lighting model.
2017-07-29 16:30:30 +00:00
Ian Curtis
a9b49c1676
Implement unclamped light model based upon Harry's findings. Unknown how this is turned on/off.
2017-07-22 17:15:14 +00:00
Ian Curtis
2335f3173b
Use c++11 raw string literals
2017-07-08 10:55:14 +00:00
Ian Curtis
3efb055344
Clamp the ambient light to a max of 0.75. LA Machine guns seems to use an ambient value of 1, which is full bright for everything. But for some reason the hardware seems to treat this as ~ 0.75. This fixes various missing shading in the game. This doesn't seem to have any negative effects on other games I have tested. Clamping in the shader as we might need the full range of values for fixed shading.
2017-06-29 19:05:30 +00:00
Ian Curtis
ec3872d108
convert sun angle coordinate system outside of the shader
2017-06-25 19:50:02 +00:00
Ian Curtis
101e43213e
cosmetic
2017-04-05 19:32:01 +00:00
Ian Curtis
edfb521a9b
Daytona seems to use this completely undocumented feature of the real3d pro-1000, the ability to invert texture colours. This patch fixes the colours on the cars, and the signs which should flash by alternating their colours.
2017-04-05 17:57:38 +00:00
Ian Curtis
f0e00c5dc7
Rewrite the spot light code, and implement the missing fog logic. (HarryTuttle)
2017-04-02 21:03:59 +00:00
Ian Curtis
69eac95846
Replace glsl 3 function. Apparently this doesn't work on OS X.
2017-03-28 20:24:44 +00:00
Bart Trzynadlowski
f34e25dfc7
Massive internal change: removed CConfig object and replaced it with a hierarchical config object system (Util::Config::Node). Games are now defined in an XML file. Hopefully I didn't break too many things :/
2017-03-27 03:19:15 +00:00
Ian Curtis
b19ceb0b6a
Texture coordinates seem to be scaled relative to the fixed texture size of 256. Thanks to HarryTurtle for figuring this crazy logic out. The road in scud matches the arcade now almost perfectly.
2017-03-13 00:59:35 +00:00
Ian Curtis
2c23268d88
Support microtexture relative scale. The exact scaling values are not known, but a 2x difference between each level seems highly likely. We know from visual inspection from scud that the first level is exactly 4. The SDK has a function that accepts a float input for scale and does this. lod = (1/scale) + 0.5. If lod>3 lod = 3. So this is our best guess.
2016-12-09 14:13:46 +00:00
Ian Curtis
483ba2f398
Fix the shading in scud. When lighting is disabled the fixed shading intensities appear to be offset values added to the colour value.
2016-11-11 17:50:27 +00:00
