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implement the complete stroke shader with custom blending mode

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This commit is contained in:
omigamedev
2017-04-05 15:55:11 +01:00
parent dc693b2232
commit 9a4fd5e5c9
13 changed files with 265 additions and 46 deletions
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62
engine/app.cpp
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@@ -157,6 +157,44 @@ void App::initShaders()
// STROKE
static const char* shader_stroke_v =
SHADER_VERSION
"uniform mat4 mvp;\n"
"uniform vec2 tof;\n"
"uniform vec2 tsz;\n"
"in vec4 pos;\n"
"in vec2 uvs;\n"
"out vec2 uv1;\n"
"out vec2 uv2;\n"
"void main(){\n"
" uv1 = uvs;\n"
" uv2 = tof + tsz * uvs;\n"
" gl_Position = mvp * vec4(pos.xyz, 1.0);\n"
"}\n";
static const char* shader_stroke_f =
SHADER_VERSION
"uniform mediump sampler2D tex;\n"
"uniform mediump sampler2D tex_bg;\n"
"uniform mediump vec4 col;\n"
"uniform mediump vec2 resolution;\n"
"uniform mediump float alpha;\n"
"in mediump vec2 uv1;\n"
"in mediump vec2 uv2;\n"
"out mediump vec4 frag;\n"
"void main(){\n"
" mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
" mediump float brush = ( 1.0 - texture(tex, uv1).r ) * alpha;\n"
" mediump vec4 bg = texture(tex_bg, uv2);\n"
" mediump vec3 rgb = mix( bg.rgb, col.rgb, clamp( brush/(brush + bg.a), 0.0, 1.0 ) );\n"
" mediump float a = bg.a + (1.0 - bg.a) * brush;\n"
" frag = vec4(rgb, a);\n"
// " mediump vec4 bg = texture(tex_bg, uv.xy);"
// " mediump float a = (1.0 - texture(tex, uv.xy).r) * alpha;"
// " frag = bg;// * vec4(col.rgb, a);\n"
"}\n";
// STROKE LAYER BLEND
static const char* shader_stroke_layer_v =
SHADER_VERSION
"uniform mat4 mvp;"
"in vec4 pos;"
@@ -166,16 +204,19 @@ void App::initShaders()
" uv = vec3(uvs, pos.w);"
" gl_Position = mvp * vec4(pos.xyz, 1.0);"
"}";
static const char* shader_stroke_f =
static const char* shader_stroke_layer_f =
SHADER_VERSION
"uniform mediump sampler2D tex;"
"uniform mediump vec4 col;"
"uniform mediump float alpha;"
"uniform mediump sampler2D tex_fg;" // foreground
"uniform mediump sampler2D tex_bg;" // canvas
"uniform mediump float alpha;" // opacity
"in mediump vec3 uv;"
"out mediump vec4 frag;"
"void main(){"
" mediump float a = (1.0 - texture(tex, uv.xy).r) * alpha;"
" frag = vec4(col.rgb, a);"
" mediump vec4 c1 = texture2D(tex_fg, uv);"
" mediump vec4 c2 = texture2D(tex_bg, uv);"
" mediump float t = clamp(c1.a / (c1.a + c2.a), 0.0, 1.0));"
" mediump vec3 rgb = mix(c1.rgb, c2.rgb, t);"
" frag = vec4(rgb, c1.a + c2.a);"
"}";
LOG("initializing shaders");
@@ -195,6 +236,8 @@ void App::initShaders()
LOG("Failed to create shader Atlas");
if (!ShaderManager::create(kShader::Stroke, shader_stroke_v, shader_stroke_f))
LOG("Failed to create shader Stroke");
if (!ShaderManager::create(kShader::StrokeLayer, shader_stroke_layer_v, shader_stroke_layer_f))
LOG("Failed to create shader StrokeLayer");
LOG("shaders initialized");
}
@@ -475,13 +518,6 @@ void App::init()
glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
#endif
//int n;
//glGetIntegerv(GL_NUM_EXTENSIONS, &n);
//for (int i = 0; i < n; i++)
//{
// const unsigned char* s = glGetStringi(GL_EXTENSIONS, i);
// LOG("GL ext %03d: %s\n", i, s);
//}
LOG("GL version: %s", glGetString(GL_VERSION));
LOG("GL vendor: %s", glGetString(GL_VENDOR));
LOG("GL renderer: %s", glGetString(GL_RENDERER));