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| author | Dan Goodliffe <dan@randomdan.homeip.net> | 2021-02-20 00:17:58 +0000 |
|---|---|---|
| committer | Dan Goodliffe <dan@randomdan.homeip.net> | 2021-02-20 00:17:58 +0000 |
| commit | 2bc4bcebc93e7211dfb84303888635f888ba8018 (patch) | |
| tree | 3a349beadc079c544001f3a65ac0e26fe494f8e5 /gfx/gl/shaders | |
| parent | Create smoother terrain (diff) | |
| download | ilt-2bc4bcebc93e7211dfb84303888635f888ba8018.tar.bz2 ilt-2bc4bcebc93e7211dfb84303888635f888ba8018.tar.xz ilt-2bc4bcebc93e7211dfb84303888635f888ba8018.zip | |
Custom land and water shaders
Create sandy beaches, snow topped mountains and grassy hills with a single texture, coloured
according to land height by a custom shader.
Also use the land mass mesh with a new water texture and a custom shader to create rather nice
looking water effect with depth, waves and motion.
Diffstat (limited to 'gfx/gl/shaders')
| -rw-r--r-- | gfx/gl/shaders/landmassShader.fs | 41 | ||||
| -rw-r--r-- | gfx/gl/shaders/landmassShader.vs | 21 | ||||
| -rw-r--r-- | gfx/gl/shaders/waterShader.fs | 13 | ||||
| -rw-r--r-- | gfx/gl/shaders/waterShader.vs | 23 |
4 files changed, 98 insertions, 0 deletions
diff --git a/gfx/gl/shaders/landmassShader.fs b/gfx/gl/shaders/landmassShader.fs new file mode 100644 index 0000000..36cc971 --- /dev/null +++ b/gfx/gl/shaders/landmassShader.fs @@ -0,0 +1,41 @@ +#version 130
+
+in vec2 texCoord0;
+in vec3 normal0;
+in float height;
+
+uniform sampler2D sampler;
+uniform vec3 lightDirection;
+uniform vec3 lightColor;
+uniform vec3 ambientColor;
+
+const vec3 grass = vec3(.1, .4, .05);
+const vec3 sand = vec3(.76, .7, .5);
+const vec3 snow = vec3(.97, .97, .99);
+
+vec2
+grad_between(float x, float lower, float upper)
+{
+ float off = (x - lower) / (upper - lower);
+ return vec2(off, 1 - off);
+}
+
+void
+main()
+{
+ gl_FragColor = texture(sampler, texCoord0);
+ gl_FragColor.xyz *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
+ if (height < 0.5) {
+ gl_FragColor.rgb *= sand;
+ }
+ else if (height > 30) {
+ gl_FragColor.rgb *= snow;
+ }
+ else if (height > 28) {
+ vec2 grad = grad_between(height, 28, 30);
+ gl_FragColor.rgb *= grass + (snow - grass) * grad.x;
+ }
+ else {
+ gl_FragColor.rgb *= grass;
+ }
+}
diff --git a/gfx/gl/shaders/landmassShader.vs b/gfx/gl/shaders/landmassShader.vs new file mode 100644 index 0000000..72c9060 --- /dev/null +++ b/gfx/gl/shaders/landmassShader.vs @@ -0,0 +1,21 @@ +#version 130
+
+in vec3 position;
+in vec2 texCoord;
+in vec3 normal;
+
+out vec2 texCoord0;
+out vec3 normal0;
+out float height;
+
+uniform mat4 viewProjection;
+uniform mat4 model;
+uniform vec3 waves;
+
+void main()
+{
+ gl_Position = viewProjection * model * vec4(position, 1.0);
+ texCoord0 = texCoord;
+ normal0 = normal;
+ height = position.y;
+}
diff --git a/gfx/gl/shaders/waterShader.fs b/gfx/gl/shaders/waterShader.fs new file mode 100644 index 0000000..bdfbc33 --- /dev/null +++ b/gfx/gl/shaders/waterShader.fs @@ -0,0 +1,13 @@ +#version 130
+
+in vec2 texCoord0;
+in float depth;
+
+uniform sampler2D sampler;
+uniform vec3 waves;
+
+void main()
+{
+ gl_FragColor = texture(sampler, texCoord0);
+ gl_FragColor.a *= clamp(-depth * .7, .1, 1.0);
+}
diff --git a/gfx/gl/shaders/waterShader.vs b/gfx/gl/shaders/waterShader.vs new file mode 100644 index 0000000..55a0fb8 --- /dev/null +++ b/gfx/gl/shaders/waterShader.vs @@ -0,0 +1,23 @@ +#version 130
+
+in vec3 position;
+in vec2 texCoord;
+in vec3 normal;
+
+out vec2 texCoord0;
+out float depth;
+
+uniform mat4 viewProjection;
+uniform mat4 model;
+uniform vec3 waves;
+
+void main()
+{
+ vec3 wpos = vec3(
+ position.x + cos(waves.x),
+ cos(waves.x + position.x + (position.z / 7)) * .3,
+ position.z + cos(waves.x * waves.z));
+ gl_Position = viewProjection * model * vec4(wpos, 1.0);
+ texCoord0 = texCoord;
+ depth = position.y;
+}
|