eaglercraft-1.8/sources/resources/assets/eagler/glsl/core.fsh

184 lines
4.8 KiB
GLSL

#line 2
/*
* Copyright (c) 2022-2023 lax1dude. All Rights Reserved.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#if defined(COMPILE_ENABLE_TEX_GEN) || defined(COMPILE_ENABLE_FOG)
in vec4 v_position4f;
#endif
#ifdef COMPILE_TEXTURE_ATTRIB
in vec2 v_texture2f;
#endif
uniform vec4 u_color4f;
#ifdef COMPILE_BLEND_ADD
uniform vec4 u_colorBlendSrc4f;
uniform vec4 u_colorBlendAdd4f;
#endif
#ifdef COMPILE_COLOR_ATTRIB
in vec4 v_color4f;
#endif
#ifdef COMPILE_NORMAL_ATTRIB
in vec3 v_normal3f;
#endif
#ifdef COMPILE_LIGHTMAP_ATTRIB
in vec2 v_lightmap2f;
#endif
#ifdef COMPILE_ENABLE_TEXTURE2D
uniform sampler2D u_samplerTexture;
#if !defined(COMPILE_TEXTURE_ATTRIB) && !defined(COMPILE_ENABLE_TEX_GEN)
uniform vec2 u_textureCoords01;
#endif
#endif
#ifdef COMPILE_ENABLE_LIGHTMAP
uniform sampler2D u_samplerLightmap;
#ifndef COMPILE_LIGHTMAP_ATTRIB
uniform vec2 u_textureCoords02;
#endif
#endif
#ifdef COMPILE_ENABLE_ALPHA_TEST
uniform float u_alphaTestRef1f;
#endif
#ifdef COMPILE_ENABLE_MC_LIGHTING
uniform int u_lightsEnabled1i;
uniform vec4 u_lightsDirections4fv[4];
uniform vec3 u_lightsAmbient3f;
#ifndef COMPILE_NORMAL_ATTRIB
uniform vec3 u_uniformNormal3f;
#endif
#endif
#ifdef COMPILE_ENABLE_FOG
uniform vec4 u_fogParameters4f;
uniform vec4 u_fogColor4f;
#endif
#ifdef COMPILE_ENABLE_TEX_GEN
in vec3 v_objectPosition3f;
uniform ivec4 u_texGenPlane4i;
uniform vec4 u_texGenS4f;
uniform vec4 u_texGenT4f;
uniform vec4 u_texGenR4f;
uniform vec4 u_texGenQ4f;
uniform mat4 u_textureMat4f01;
#endif
#ifdef COMPILE_ENABLE_ANISOTROPIC_FIX
uniform vec2 u_textureAnisotropicFix;
#endif
layout(location = 0) out vec4 output4f;
void main() {
#ifdef COMPILE_COLOR_ATTRIB
vec4 color = v_color4f * u_color4f;
#else
vec4 color = u_color4f;
#endif
#ifdef COMPILE_ENABLE_TEX_GEN
vec4 texGenVector;
vec4 texGenPosSrc[2];
texGenPosSrc[0] = vec4(v_objectPosition3f, 1.0);
texGenPosSrc[1] = v_position4f;
texGenVector.x = dot(texGenPosSrc[u_texGenPlane4i.x], u_texGenS4f);
texGenVector.y = dot(texGenPosSrc[u_texGenPlane4i.y], u_texGenT4f);
texGenVector.z = dot(texGenPosSrc[u_texGenPlane4i.z], u_texGenR4f);
texGenVector.w = dot(texGenPosSrc[u_texGenPlane4i.w], u_texGenQ4f);
texGenVector = u_textureMat4f01 * texGenVector;
color *= texture(u_samplerTexture, texGenVector.xy / texGenVector.w);
#ifdef COMPILE_ENABLE_ALPHA_TEST
if(color.a < u_alphaTestRef1f) discard;
#endif
#else
#ifdef COMPILE_ENABLE_TEXTURE2D
#ifdef COMPILE_TEXTURE_ATTRIB
#ifdef COMPILE_ENABLE_ANISOTROPIC_FIX
// d3d11 doesn't support GL_NEAREST upscaling with anisotropic
// filtering enabled, so it needs this stupid fix to 'work'
vec2 uv = floor(v_texture2f * u_textureAnisotropicFix) + 0.5;
color *= texture(u_samplerTexture, uv / u_textureAnisotropicFix);
#else
color *= texture(u_samplerTexture, v_texture2f);
#endif
#else
color *= texture(u_samplerTexture, u_textureCoords01);
#endif
#endif
#ifdef COMPILE_ENABLE_LIGHTMAP
#ifdef COMPILE_LIGHTMAP_ATTRIB
color *= texture(u_samplerLightmap, v_lightmap2f);
#else
color *= texture(u_samplerLightmap, u_textureCoords02);
#endif
#endif
#ifdef COMPILE_BLEND_ADD
color = color * u_colorBlendSrc4f + u_colorBlendAdd4f;
#endif
#ifdef COMPILE_ENABLE_ALPHA_TEST
if(color.a < u_alphaTestRef1f) discard;
#endif
#endif
#ifdef COMPILE_ENABLE_MC_LIGHTING
#ifdef COMPILE_NORMAL_ATTRIB
vec3 normal = normalize(v_normal3f);
#else
vec3 normal = u_uniformNormal3f;
#endif
float diffuse = 0.0;
vec4 light;
for(int i = 0; i < u_lightsEnabled1i; ++i) {
light = u_lightsDirections4fv[i];
diffuse += max(dot(light.xyz, normal), 0.0) * light.w;
}
color.rgb *= min(u_lightsAmbient3f + vec3(diffuse), 1.0);
#endif
#ifdef COMPILE_ENABLE_FOG
vec3 fogPos = v_position4f.xyz / v_position4f.w;
float dist = length(fogPos);
float fogDensity = u_fogParameters4f.y;
float fogStart = u_fogParameters4f.z;
float fogEnd = u_fogParameters4f.w;
float f = u_fogParameters4f.x > 0.0 ? 1.0 - exp(-fogDensity * dist) :
(dist - fogStart) / (fogEnd - fogStart);
color.rgb = mix(color.rgb, u_fogColor4f.rgb, clamp(f, 0.0, 1.0) * u_fogColor4f.a);
#endif
output4f = color;
}