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Water surface shader

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Does not warp anything beneath the surface YET, just the texture itself, but it's far better than nothing
This commit is contained in:
Sally Cochenour 2020-01-08 03:37:46 -05:00
parent 7d8ff43019
commit 465b3b1559
1 changed files with 44 additions and 2 deletions
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46
src/hardware/r_opengl/r_opengl.c
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@ -653,6 +653,48 @@ static gl_shaderprogram_t gl_shaderprograms[MAXSHADERPROGRAMS];
"gl_FragColor = final_color;\n" \ "gl_FragColor = final_color;\n" \
"}\0" "}\0"
//
// Water surface shader
//
// Mostly guesstimated, rather than the rest being built off Software science.
// Still needs to distort things underneath/around the water...
//
#define GLSL_WATER_FRAGMENT_SHADER \
"uniform sampler2D tex;\n" \
"uniform vec4 poly_color;\n" \
"uniform vec4 tint_color;\n" \
"uniform vec4 fade_color;\n" \
"uniform float lighting;\n" \
"uniform float fade_start;\n" \
"uniform float fade_end;\n" \
"uniform float leveltime;\n" \
"const float freq = 0.025;\n" \
"const float amp = 0.025;\n" \
"const float speed = 2.0;\n" \
"const float pi = 3.14159;\n" \
GLSL_DOOM_COLORMAP \
GLSL_DOOM_LIGHT_EQUATION \
"void main(void) {\n" \
"float z = gl_FragCoord.z / gl_FragCoord.w;\n" \
"float input = -pi * (z * freq) + (leveltime * speed);\n" \
"float sdistort = sin(input) * amp;\n" \
"float cdistort = cos(input) * amp;\n" \
"vec4 texel = texture2D(tex, vec2(gl_TexCoord[0].s - sdistort, gl_TexCoord[0].t - cdistort));\n" \
"vec4 base_color = texel * poly_color;\n" \
"vec4 final_color = base_color;\n" \
GLSL_SOFTWARE_TINT_EQUATION \
GLSL_SOFTWARE_FADE_EQUATION \
"final_color.a = texel.a * poly_color.a;\n" \
"gl_FragColor = final_color;\n" \
"}\0"
//
// Fog block shader
//
// Alpha of the planes themselves are still slightly off -- see HWR_FogBlockAlpha
//
#define GLSL_FOG_FRAGMENT_SHADER \ #define GLSL_FOG_FRAGMENT_SHADER \
"uniform vec4 tint_color;\n" \ "uniform vec4 tint_color;\n" \
"uniform vec4 fade_color;\n" \ "uniform vec4 fade_color;\n" \
@ -697,7 +739,7 @@ static const char *fragment_shaders[] = {
GLSL_SOFTWARE_FRAGMENT_SHADER, GLSL_SOFTWARE_FRAGMENT_SHADER,
// Water fragment shader // Water fragment shader
GLSL_SOFTWARE_FRAGMENT_SHADER, GLSL_WATER_FRAGMENT_SHADER,
// Fog fragment shader // Fog fragment shader
GLSL_FOG_FRAGMENT_SHADER, GLSL_FOG_FRAGMENT_SHADER,
@ -705,7 +747,7 @@ static const char *fragment_shaders[] = {
// Sky fragment shader // Sky fragment shader
"uniform sampler2D tex;\n" "uniform sampler2D tex;\n"
"void main(void) {\n" "void main(void) {\n"
"gl_FragColor = texture2D(tex, gl_TexCoord[0].st);\n" \ "gl_FragColor = texture2D(tex, gl_TexCoord[0].st);\n"
"}\0", "}\0",
NULL, NULL,