Hi,
I have a shader (2) with:
----8<----
uniform vec2 foo[8];
----8<----
which I can't fully use in vanilla Gem: glGetActiveUniform (1) seems to
return the name "foo[0]", and Gem uses glUniform2f(...) which only
allows me to set the first 2 floats in the array (ie, the first element)
with a message like "foo[0] 1.2 3.4" to [glsl_program].
Luckily a quick/hacky fix (using glUniform2fv with the m_size returned
from glGet) I tried turned out to work very well, and could probably be
extended to a full fix for all these array things:
----8<----
diff --git a/src/Manips/glsl_program.cpp b/src/Manips/glsl_program.cpp
index 52e80d1..4eabb8a 100644
--- a/src/Manips/glsl_program.cpp
+++ b/src/Manips/glsl_program.cpp
@@ -214,7 +214,7 @@ void glsl_program :: renderGL2()
glUniform1f( m_loc[i],
static_cast<GLfloat>(m_param[i][0]) );
break;
case GL_FLOAT_VEC2:
- glUniform2f( m_loc[i],
static_cast<GLfloat>(m_param[i][0]), static_cast<GLfloat>(m_param[i][1]) );
+ glUniform2fv( m_loc[i], m_size[i],
static_cast<GLfloat*>(&m_param[i][0]) );
break;
case GL_FLOAT_VEC3:
glUniform3f( m_loc[i],
static_cast<GLfloat>(m_param[i][0]), static_cast<GLfloat>(m_param[i][1]),
----8<----
I still have to use the uniform name "foo[0]", but I can now set all the
values I want (so far tested with 10 floats (5 vec2s), and all seems
groovy. I see no reason why it shouldn't work for a single vec2, but I
haven't tested that yet.
Thanks,
Claude
(1) http://www.opengl.org/sdk/docs/man/xhtml/glGetActiveUniform.xml
(2)
WebGL: https://gitorious.org/maximus/fractaloids
Haskell: http://archive.org/details/ClaudiusMaximus_-_Fractal_Juggling
Pd+Gem: (coming soon)
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