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Starting to work on replacement for clip planes

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This commit is contained in:
Brad Davis 2015-02-03 22:10:44 -08:00
parent 0c78af9abb
commit 9a6175a3b9
1 changed files with 28 additions and 4 deletions
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32
libraries/render-utils/src/TextRenderer.cpp
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@ -66,6 +66,8 @@ const char SHADER_TEXT_VS[] = R"XXXX(#version 330
uniform mat4 Projection = mat4(1);
uniform mat4 ModelView = mat4(1);
uniform vec4 ClipPlane[4];
uniform int ClipPlaneCount = 0;
layout(location = 0) in vec3 Position;
layout(location = 1) in vec2 TexCoord;
@ -74,16 +76,37 @@ out vec2 vTexCoord;
void main() {
vTexCoord = TexCoord;
gl_Position = Projection * ModelView * vec4(Position, 1);
vec4 clipVertex = ModelView * vec4(Position, 1);
for (int i = 0; i < ClipPlaneCount; ++i) {
gl_ClipDistance[i] = dot( ClipPlane[i], clipVertex);
}
gl_Position = Projection * clipVertex;
})XXXX";
const char SHADER_TEXT_GS[] = R"XXXX(#version 330
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
in vec2 vTexCoord[];
out vec2 gTexCoord;
void main() {
for (int i = 0; i < 3; ++i) {
gl_Position = gl_in[i].gl_Position;
gTexCoord = vTexCoord[i];
EmitVertex();
}
EndPrimitive();
}
)XXXX";
const char SHADER_TEXT_FS[] = R"XXXX(#version 330
uniform sampler2D Font;
uniform vec4 Color = vec4(1);
uniform bool Outline = false;
in vec2 vTexCoord;
in vec2 gTexCoord;
out vec4 FragColor;
const float gamma = 2.6;
@ -93,7 +116,7 @@ void main() {
FragColor = vec4(1);
// retrieve signed distance
float sdf = texture(Font, vTexCoord).r;
float sdf = texture(Font, gTexCoord).r;
if (Outline) {
if (sdf > 0.8) {
sdf = 1.0 - sdf;
@ -103,7 +126,7 @@ void main() {
}
// perform adaptive anti-aliasing of the edges
// The larger we're rendering, the less anti-aliasing we need
float s = smoothing * length(fwidth(vTexCoord));
float s = smoothing * length(fwidth(gTexCoord));
float w = clamp( s, 0.0, 0.5);
float a = smoothstep(0.5 - w, 0.5 + w, sdf);
@ -306,6 +329,7 @@ void Font::setupGL() {
if (
!_program->addShaderFromSourceCode(QOpenGLShader::Vertex, SHADER_TEXT_VS) ||
!_program->addShaderFromSourceCode(QOpenGLShader::Fragment, SHADER_TEXT_FS) ||
!_program->addShaderFromSourceCode(QOpenGLShader::Geometry, SHADER_TEXT_GS) ||
!_program->link()) {
qFatal(_program->log().toLocal8Bit().constData());
}