Remove the deprecated ProgramBuilder class

[libs/gl.git] / source / vertexsetup.cpp

diff --git a/source/vertexsetup.cpp b/source/vertexsetup.cpp
index 8465ab060d54fe77041106a2c3c67a342102116e..d50406a1ab70ce44e7caf645d46009a308c8e86f 100644 (file)
--- a/source/vertexsetup.cpp
+++ b/source/vertexsetup.cpp
@@ -6,10 +6,13 @@
 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
 #include <msp/gl/extensions/arb_vertex_shader.h>
 #include "buffer.h"
+#include "error.h"
 #include "gl.h"
 #include "vertexarray.h"
 #include "vertexsetup.h"
 
+using namespace std;
+
 namespace Msp {
 namespace GL {
 
@@ -35,17 +38,27 @@ VertexSetup::~VertexSetup()
 
 void VertexSetup::set_vertex_array(const VertexArray &a)
 {
+       if(!a.get_buffer())
+               throw invalid_argument("VertexSetup::set_vertex_array");
+
        vertex_array = &a;
-       update(VERTEX_ARRAY);
+       update(get_update_mask(VERTEX_ARRAY, vertex_format, *vertex_array));
+       vertex_format = vertex_array->get_format();
 }
 
 void VertexSetup::set_instance_array(const VertexArray *a)
 {
        if(a)
+       {
+               if(!a->get_buffer())
+                       throw invalid_argument("VertexSetup::set_instance_array");
+
                static Require req(ARB_instanced_arrays);
+       }
 
        inst_array = a;
-       update(INSTANCE_ARRAY);
+       update(get_update_mask(INSTANCE_ARRAY, inst_format, *inst_array));
+       inst_format = inst_array->get_format();
 }
 
 void VertexSetup::set_index_buffer(const Buffer &ibuf)
@@ -54,6 +67,34 @@ void VertexSetup::set_index_buffer(const Buffer &ibuf)
        update(INDEX_BUFFER);
 }
 
+void VertexSetup::refresh()
+{
+       if(vertex_array && vertex_array->get_format()!=vertex_format)
+               set_vertex_array(*vertex_array);
+
+       if(inst_array && inst_array->get_format()!=inst_format)
+               set_instance_array(inst_array);
+}
+
+unsigned VertexSetup::get_attribs(const VertexFormat &fmt)
+{
+       unsigned mask = 0;
+       for(const unsigned char *c=fmt.begin(); c!=fmt.end(); ++c)
+       {
+               unsigned t = get_component_type(*c);
+               if(t>=get_component_type(ATTRIB1))
+                       t -= get_component_type(ATTRIB1);
+               mask |= 1<<t;
+       }
+       return mask;
+}
+
+unsigned VertexSetup::get_update_mask(unsigned base, const VertexFormat &cur_fmt, const VertexArray &new_array)
+{
+       unsigned unused = get_attribs(cur_fmt)&~get_attribs(new_array.get_format());
+       return base | (unused ? UNUSED_ATTRIBS | (unused<<ATTRIB_SHIFT) : 0);
+}
+
 void VertexSetup::update(unsigned mask) const
 {
        static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
@@ -63,14 +104,23 @@ void VertexSetup::update(unsigned mask) const
                return;
        }
 
+       if(mask&UNUSED_ATTRIBS)
+       {
+               for(unsigned i=0, am=mask>>ATTRIB_SHIFT; am; ++i, am>>=1)
+                       if(am&1)
+                       {
+                               if(direct)
+                                       glDisableVertexArrayAttrib(id, i);
+                               else
+                                       glDisableVertexAttribArray(i);
+                       }
+       }
+
        if(mask&VERTEX_ARRAY)
                update_vertex_array(*vertex_array, 0, 0, direct);
 
-       if(mask&INSTANCE_ARRAY)
-       {
-               if(inst_array)
-                       update_vertex_array(*inst_array, 1, 1, direct);
-       }
+       if((mask&INSTANCE_ARRAY) && inst_array)
+               update_vertex_array(*inst_array, 1, 1, direct);
 
        if(mask&INDEX_BUFFER)
        {
@@ -115,7 +165,8 @@ void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding
                                glVertexAttribPointer(t, 4, GL_UNSIGNED_BYTE, true, stride, reinterpret_cast<unsigned char *>(offset));
                        else
                                glVertexAttribPointer(t, sz, GL_FLOAT, false, stride, reinterpret_cast<float *>(offset));
-                       glVertexAttribDivisor(t, divisor);
+                       if(ARB_instanced_arrays)
+                               glVertexAttribDivisor(t, divisor);
                        glEnableVertexAttribArray(t);
                }
                offset += sz*sizeof(float);
@@ -124,8 +175,14 @@ void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding
 
 void VertexSetup::bind() const
 {
+       if(!vertex_array || !index_buffer)
+               throw invalid_operation("VertexSetup::bind");
+
        if(set_current(this))
        {
+               vertex_array->refresh();
+               if(inst_array)
+                       inst_array->refresh();
                glBindVertexArray(id);
                if(dirty)
                {