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add checkerboard shader and draw it

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This commit is contained in:
omigamedev
2017-04-29 23:12:36 +01:00
parent 73f689524b
commit 78a87f9cd3
3 changed files with 37 additions and 7 deletions
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24
engine/app.cpp
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@@ -240,6 +240,28 @@ void App::initShaders()
" frag = vec4(rgb, alpha_tot);\n"
"}\n";
static const char* shader_checkerboard_v =
SHADER_VERSION
"uniform mat4 mvp;\n"
"in vec4 pos;\n"
"in vec2 uvs;\n"
"out vec2 uv;\n"
"void main(){\n"
" uv = uvs;\n"
" gl_Position = mvp * vec4(pos.xyz, 1.0);\n"
"}";
static const char* shader_checkerboard_f =
SHADER_VERSION
"in mediump vec2 uv;\n"
"out mediump vec4 frag;\n"
"void main(){\n"
" const vec4 c1 = vec4(1.0, 1.0, 1.0, 1.0);\n"
" const vec4 c2 = vec4(0.9, 0.9, 0.9, 1.0);\n"
" vec2 c = floor(fract(uv * 10.0) * 2.0);\n"
" float alpha = mix(c.x, 1.0 - c.x, c.y);\n"
" frag = mix(c1, c2, alpha);\n"
"}";
LOG("initializing shaders");
if (!ShaderManager::create(kShader::Texture, shader_v, shader_f))
LOG("Failed to create shader Texture");
@@ -263,6 +285,8 @@ void App::initShaders()
LOG("Failed to create shader StrokeErase");
if (!ShaderManager::create(kShader::StrokeLayer, shader_stroke_layer_v, shader_stroke_layer_f))
LOG("Failed to create shader StrokeLayer");
if (!ShaderManager::create(kShader::Checkerboard, shader_checkerboard_v, shader_checkerboard_f))
LOG("Failed to create shader Checkerboard");
LOG("shaders initialized");
}