More flexible system for customizing generated shaders

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

diff --git a/source/program.cpp b/source/program.cpp
index 636988d75c75dd11f3728906cf3c761b31553b34..baeba9f5c33d1091da815f0d14d7f6be45807b3b 100644 (file)
--- a/source/program.cpp
+++ b/source/program.cpp
@@ -2,12 +2,14 @@
 #include <cstring>
 #include <msp/core/hash.h>
 #include <msp/core/maputils.h>
+#include <msp/gl/extensions/arb_shader_objects.h>
+#include <msp/gl/extensions/arb_uniform_buffer_object.h>
+#include <msp/gl/extensions/arb_vertex_shader.h>
+#include <msp/gl/extensions/ext_gpu_shader4.h>
 #include <msp/strings/format.h>
-#include "arb_shader_objects.h"
-#include "arb_uniform_buffer_object.h"
-#include "arb_vertex_shader.h"
 #include "buffer.h"
 #include "error.h"
+#include "misc.h"
 #include "program.h"
 #include "shader.h"
 
@@ -27,8 +29,7 @@ Program::Program(const ProgramBuilder::StandardFeatures &features)
 
        ProgramBuilder builder(features);
        builder.add_shaders(*this);
-       if(!features.transform)
-               link();
+       link();
 }
 
 Program::Program(const string &vert, const string &frag)
@@ -87,6 +88,17 @@ void Program::bind_attribute(unsigned index, const string &name)
        glBindAttribLocation(id, index, name.c_str());
 }
 
+void Program::bind_attribute(VertexComponent comp, const string &name)
+{
+       bind_attribute(get_component_type(comp), name);
+}
+
+void Program::bind_fragment_data(unsigned index, const string &name)
+{
+       static Require _req(EXT_gpu_shader4);
+       glBindFragDataLocation(id, index, name.c_str());
+}
+
 void Program::link()
 {
        for(ShaderList::iterator i=shaders.begin(); i!=shaders.end(); ++i)
@@ -94,15 +106,14 @@ void Program::link()
                        (*i)->compile();
 
        uniforms.clear();
+       legacy_vars = false;
 
        glLinkProgram(id);
-       int value;
-       glGetProgramiv(id, GL_LINK_STATUS, &value);
-       if(!(linked = value))
+       linked = get_program_i(id, GL_LINK_STATUS);
+       if(!linked)
                throw compile_error(get_info_log());
 
-       glGetProgramiv(id, GL_ACTIVE_UNIFORMS, &value);
-       unsigned count = value;
+       unsigned count = get_program_i(id, GL_ACTIVE_UNIFORMS);
        vector<UniformInfo *> uniforms_by_index(count);
        for(unsigned i=0; i<count; ++i)
        {
@@ -110,9 +121,14 @@ void Program::link()
                int len = 0;
                int size;
                GLenum type;
-               glGetActiveUniform(id, i, 128, &len, &size, &type, name);
+               glGetActiveUniform(id, i, sizeof(name), &len, &size, &type, name);
                if(len && strncmp(name, "gl_", 3))
                {
+                       /* Some implementations report the first element of a uniform array,
+                       others report just the name of an array. */
+                       if(len>3 && !strcmp(name+len-3, "[0]"))
+                               name[len-3] = 0;
+
                        UniformInfo &info = uniforms[name];
                        info.block = 0;
                        info.name = name;
@@ -122,20 +138,34 @@ void Program::link()
                        info.type = type;
                        uniforms_by_index[i] = &info;
                }
+               else
+                       legacy_vars = true;
+       }
+
+       count = get_program_i(id, GL_ACTIVE_ATTRIBUTES);
+       for(unsigned i=0; i<count; ++i)
+       {
+               char name[128];
+               int len = 0;
+               int size;
+               GLenum type;
+               glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
+               if(len && !strncmp(name, "gl_", 3))
+                       legacy_vars = true;
        }
 
        if(ARB_uniform_buffer_object)
        {
-               glGetProgramiv(id, GL_ACTIVE_UNIFORM_BLOCKS, &value);
-               count = value;
+               count = get_program_i(id, GL_ACTIVE_UNIFORM_BLOCKS);
                for(unsigned i=0; i<count; ++i)
                {
                        char name[128];
                        int len;
-                       glGetActiveUniformBlockName(id, i, 128, &len, name);
+                       glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
                        UniformBlockInfo &info = uniform_blocks[name];
                        info.name = name;
 
+                       int value;
                        glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
                        info.data_size = value;
 
@@ -216,8 +246,7 @@ bool Program::uniform_location_compare(const UniformInfo *uni1, const UniformInf
 
 string Program::get_info_log() const
 {
-       GLsizei len = 0;
-       glGetProgramiv(id, GL_INFO_LOG_LENGTH, &len);
+       GLsizei len = get_program_i(id, GL_INFO_LOG_LENGTH);
        char *buf = new char[len+1];
        glGetProgramInfoLog(id, len+1, &len, buf);
        string log(buf, len);
@@ -249,7 +278,7 @@ int Program::get_uniform_location(const string &n) const
                                gives us the first element of the array, so try to look that up and
                                add an offset. */
                                unsigned offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
-                               i = uniforms.find(n.substr(0, open_bracket)+"[0]");
+                               i = uniforms.find(n.substr(0, open_bracket));
                                if(i!=uniforms.end() && !i->second.block && offset<i->second.size)
                                        return i->second.location+offset;
                        }