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

#line 2

/*
 * Copyright (c) 2022-2024 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)
EAGLER_IN(vec4, v_position4f)
#endif

#ifdef COMPILE_TEXTURE_ATTRIB
EAGLER_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
EAGLER_IN(vec4, v_color4f)
#endif

#ifdef COMPILE_NORMAL_ATTRIB
EAGLER_IN(vec3, v_normal3f)
#endif

#ifdef COMPILE_LIGHTMAP_ATTRIB
EAGLER_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
EAGLER_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

EAGLER_FRAG_OUT()

void main() {

#ifdef COMPILE_COLOR_ATTRIB
	vec4 color = v_color4f * u_color4f;
#else
	vec4 color = u_color4f;
#endif

#ifdef COMPILE_ENABLE_TEX_GEN
	vec4 tmpVec4 = vec4(v_objectPosition3f, 1.0);
	vec4 texGenVector;
	texGenVector.x = dot(u_texGenPlane4i.x == 1 ? v_position4f : tmpVec4, u_texGenS4f);
	texGenVector.y = dot(u_texGenPlane4i.y == 1 ? v_position4f : tmpVec4, u_texGenT4f);
	texGenVector.z = dot(u_texGenPlane4i.z == 1 ? v_position4f : tmpVec4, u_texGenR4f);
	texGenVector.w = dot(u_texGenPlane4i.w == 1 ? v_position4f : tmpVec4, u_texGenQ4f);
#ifdef EAGLER_HAS_GLES_300
	texGenVector.xyz = mat4x3(
		u_textureMat4f01[0].xyw,
		u_textureMat4f01[1].xyw,
		u_textureMat4f01[2].xyw,
		u_textureMat4f01[3].xyw
	) * texGenVector;
	texGenVector.xy /= texGenVector.z;
#else
	texGenVector = u_textureMat4f01 * texGenVector;
	texGenVector.xy /= texGenVector.w;
#endif

	color *= EAGLER_TEXTURE_2D(u_samplerTexture, texGenVector.xy);

#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 *= EAGLER_TEXTURE_2D(u_samplerTexture, uv / u_textureAnisotropicFix);
#else
	color *= EAGLER_TEXTURE_2D(u_samplerTexture, v_texture2f);
#endif
#else
	color *= EAGLER_TEXTURE_2D(u_samplerTexture, u_textureCoords01);
#endif
#endif

#ifdef COMPILE_ENABLE_LIGHTMAP
#ifdef COMPILE_LIGHTMAP_ATTRIB
	color *= EAGLER_TEXTURE_2D(u_samplerLightmap, v_lightmap2f);
#else
	color *= EAGLER_TEXTURE_2D(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 = v_normal3f;
#else
	vec3 normal = u_uniformNormal3f;
#endif
	float diffuse = 0.0;
	vec4 light;
#ifdef EAGLER_HAS_GLES_300
	for(int i = 0; i < u_lightsEnabled1i; ++i) {
#else
	for(int i = 0; i < 4; ++i) {
#endif
		light = u_lightsDirections4fv[i];
		diffuse += max(dot(light.xyz, normal), 0.0) * light.w;
#ifndef EAGLER_HAS_GLES_300
		if(i + 1 >= u_lightsEnabled1i) {
			break;
		}
#endif
	}
	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

	EAGLER_FRAG_COLOR = color;
}