mirror of
https://git.dev.opencascade.org/repos/occt.git
synced 2025-04-04 18:06:22 +03:00
8e0a2b19ab
Graphic3d_TypeOfShaderObject enumeration has been extended by Geometry shader object type. OpenGl_ShaderProgram::Initialize() processes new shader object types when supported by OpenGL version. Declarations.glsl has been fixed so that occFragColor is defined only for Fragment Shader object only (by handling new FRAGMENT_SHADER macros). Improved documentation of Graphic3d_ArrayOfPrimitives class. vshader Draw Harness command has been extended to support definition of Shader Object types other than Vertex and Fragment shader.
76 lines
1.9 KiB
Plaintext
76 lines
1.9 KiB
Plaintext
puts "========"
|
|
puts "0029074: Visualization, TKOpenGl - support of Tessellation Shaders"
|
|
puts "========"
|
|
|
|
pload MODELING VISUALIZATION
|
|
|
|
set aShaderVert "
|
|
out vec4 VertColor;
|
|
void main() {
|
|
VertColor = occColor;
|
|
gl_Position = occVertex;
|
|
}"
|
|
|
|
set aShaderTessCtrl "
|
|
layout(vertices = 3) out;
|
|
void main() {
|
|
if (gl_InvocationID == 0) {
|
|
gl_TessLevelInner\[0\] = 7.0;
|
|
gl_TessLevelOuter\[0\] = 2.0;
|
|
gl_TessLevelOuter\[1\] = 3.0;
|
|
gl_TessLevelOuter\[2\] = 7.0;
|
|
}
|
|
gl_out\[gl_InvocationID\].gl_Position = gl_in\[gl_InvocationID\].gl_Position;
|
|
}"
|
|
|
|
set aShaderTessEval "
|
|
layout(triangles, equal_spacing, ccw) in;
|
|
void main() {
|
|
vec3 aPnt0 = gl_TessCoord.x * gl_in\[0\].gl_Position.xyz;
|
|
vec3 aPnt1 = gl_TessCoord.y * gl_in\[1\].gl_Position.xyz;
|
|
vec3 aPnt2 = gl_TessCoord.z * gl_in\[2\].gl_Position.xyz;
|
|
gl_Position = vec4 (aPnt0 + aPnt1 + aPnt2, 1.0);
|
|
}"
|
|
|
|
set aShaderGeom "
|
|
layout(triangles) in;
|
|
layout(triangle_strip, max_vertices=3) out;
|
|
void main() {
|
|
mat4 aMat = occProjectionMatrix * occWorldViewMatrix * occModelWorldMatrix;
|
|
vec3 aCenter = vec3 (0.0, 0.0, 0.0);
|
|
for (int aTriVertIter = 0; aTriVertIter < 3; ++aTriVertIter) {
|
|
aCenter += gl_in\[aTriVertIter\].gl_Position.xyz;
|
|
}
|
|
aCenter /= 3.0;
|
|
for (int aTriVertIter = 0; aTriVertIter < 3; ++aTriVertIter) {
|
|
vec3 aVec = gl_in\[aTriVertIter\].gl_Position.xyz - aCenter;
|
|
vec3 aVertRes = aCenter + normalize (aVec) * length (aVec) * 0.75;
|
|
gl_Position = aMat * vec4 (aVertRes, 1.0);
|
|
EmitVertex();
|
|
}
|
|
EndPrimitive();
|
|
}"
|
|
|
|
set aShaderFrag "
|
|
void main() {
|
|
occFragColor = vec4(1.0, 0.0, 0.0, 1.0);
|
|
}"
|
|
|
|
# draw a box
|
|
box b 1 2 3
|
|
explode b F
|
|
|
|
vcaps -core
|
|
vclear
|
|
vinit View1
|
|
vaxo
|
|
vdisplay -dispMode 1 -mutable b_1
|
|
vfit
|
|
vrotate 0.2 0.0 0.0
|
|
|
|
# take snapshot with built-in shader
|
|
vdump $::imagedir/${::casename}_normal.png
|
|
|
|
vshaderprog b_1 -vert $aShaderVert -tessCtrl $aShaderTessCtrl -tessEval $aShaderTessEval -geom $aShaderGeom -frag $aShaderFrag
|
|
vdump $::imagedir/${::casename}_tess.png
|