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Basic fog shader

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HWR_FogBlockAlpha is still very inaccurate, which gives different results than Software even with the shader, but it's a start
This commit is contained in:
Sally Cochenour 2020-01-07 20:55:36 -05:00
parent a35a2c81e2
commit 7d8ff43019
2 changed files with 39 additions and 32 deletions
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29
src/hardware/hw_main.c
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@ -216,20 +216,27 @@ UINT8 HWR_FogBlockAlpha(INT32 light, extracolormap_t *colormap) // Let's see if
RGBA_t realcolor, surfcolor;
INT32 alpha;
light = light - (255 - light);
// Don't go out of bounds
if (light < 0)
light = 0;
else if (light > 255)
light = 255;
realcolor.rgba = (colormap != NULL) ? colormap->rgba : GL_DEFAULTMIX;
alpha = (realcolor.s.alpha*255)/25;
if (cv_grshaders.value)
{
surfcolor.s.alpha = (255 - light);
}
else
{
light = light - (255 - light);
// at 255 brightness, alpha is between 0 and 127, at 0 brightness alpha will always be 255
surfcolor.s.alpha = (alpha*light)/(2*256)+255-light;
// Don't go out of bounds
if (light < 0)
light = 0;
else if (light > 255)
light = 255;
alpha = (realcolor.s.alpha*255)/25;
// at 255 brightness, alpha is between 0 and 127, at 0 brightness alpha will always be 255
surfcolor.s.alpha = (alpha*light) / (2*256) + 255-light;
}
return surfcolor.s.alpha;
}

42
src/hardware/r_opengl/r_opengl.c
View file

@ -31,6 +31,7 @@
#include <math.h>
#include "r_opengl.h"
#include "r_vbo.h"
#include "../../p_tick.h" // for leveltime (NOTE: THIS IS BAD, FIGURE OUT HOW TO PROPERLY IMPLEMENT gl_leveltime)
#if defined (HWRENDER) && !defined (NOROPENGL)
@ -595,19 +596,6 @@ static gl_shaderprogram_t gl_shaderprograms[MAXSHADERPROGRAMS];
// GLSL Software fragment shader
//
#if 0
// Old ZDoom style
#define GLSL_DOOM_COLORMAP \
"float R_DoomColormap(float light, float z)\n" \
"{\n" \
"float vis = min(29.0 / z, 24.0 / 32.0);\n" \
"float shade = 2.0 - (light + 12.0) / 128.0;\n" \
"float lightscale = shade - vis;\n" \
"return lightscale * 31.0;\n" \
"}\n"
#else
// TODO: This is R_PlaneColormap, need a way to get polygon normal to add R_WallColormap
#define GLSL_DOOM_COLORMAP \
"float R_DoomColormap(float light, float z)\n" \
"{\n" \
@ -617,7 +605,6 @@ static gl_shaderprogram_t gl_shaderprograms[MAXSHADERPROGRAMS];
"float scale = 160.0 / (lightz + 1.0);\n" \
"return startmap - scale * 0.5;\n" \
"}\n"
#endif
#define GLSL_DOOM_LIGHT_EQUATION \
"float R_DoomLightingEquation(float light)\n" \
@ -666,6 +653,21 @@ static gl_shaderprogram_t gl_shaderprograms[MAXSHADERPROGRAMS];
"gl_FragColor = final_color;\n" \
"}\0"
#define GLSL_FOG_FRAGMENT_SHADER \
"uniform vec4 tint_color;\n" \
"uniform vec4 fade_color;\n" \
"uniform float lighting;\n" \
"uniform float fade_start;\n" \
"uniform float fade_end;\n" \
GLSL_DOOM_COLORMAP \
GLSL_DOOM_LIGHT_EQUATION \
"void main(void) {\n" \
"vec4 base_color = gl_Color;\n" \
"vec4 final_color = base_color;\n" \
GLSL_SOFTWARE_TINT_EQUATION \
GLSL_SOFTWARE_FADE_EQUATION \
"gl_FragColor = final_color;\n" \
"}\0"
//
// GLSL generic fragment shader
@ -698,9 +700,7 @@ static const char *fragment_shaders[] = {
GLSL_SOFTWARE_FRAGMENT_SHADER,
// Fog fragment shader
"void main(void) {\n"
"gl_FragColor = gl_Color;\n"
"}\0",
GLSL_FOG_FRAGMENT_SHADER,
// Sky fragment shader
"uniform sampler2D tex;\n"
@ -1812,12 +1812,12 @@ static void load_shaders(FSurfaceInfo *Surface, GLRGBAFloat *poly, GLRGBAFloat *
UNIFORM_1(shader->uniforms[gluniform_lighting], Surface->LightInfo.light_level, pglUniform1f);
UNIFORM_1(shader->uniforms[gluniform_fade_start], Surface->LightInfo.fade_start, pglUniform1f);
UNIFORM_1(shader->uniforms[gluniform_fade_end], Surface->LightInfo.fade_end, pglUniform1f);
UNIFORM_1(shader->uniforms[gluniform_leveltime], ((float)leveltime) / TICRATE, pglUniform1f);
// Custom shader uniforms
if (custom)
{
UNIFORM_1(shader->uniforms[gluniform_leveltime], (float)gl_leveltime, pglUniform1f);
}
//if (custom) { }
(void)custom;
#undef UNIFORM_1
#undef UNIFORM_2
#undef UNIFORM_3