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Just getting started with real shader generator

This commit is contained in:
Josh Yelon 2007-12-16 08:05:18 +00:00
parent e02fcbbb21
commit 439ef40cff
1 changed files with 63 additions and 36 deletions
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99
panda/src/pgraph/shaderGenerator.cxx
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@ -25,45 +25,72 @@
// Access: Public, Static
// Description: This is the routine that implements the next-gen
// fixed function pipeline by synthesizing a shader.
//
// Currently supports:
// - textures
// - materials
// - lights
//
// Not yet supported:
// - vertex colors
// - texgen
// - texmatrix
// - separate normal and gloss
// - lots of other things
//
////////////////////////////////////////////////////////////////////
CPT(RenderAttrib) ShaderGenerator::
synthesize_shader(const RenderState *rs) {
// Stub code: just return this shader.
AttribSlots attribs;
rs->store_into_slots(&attribs);
PT(Shader) shader = Shader::make(
"//Cg \n"
"// \n"
"//Cg profile arbvp1 arbfp1 \n"
" \n"
"void vshader(float4 vtx_position : POSITION, \n"
" float3 vtx_normal : NORMAL, \n"
" float4 vtx_color : COLOR, \n"
" out float4 l_position : POSITION, \n"
" out float4 l_brite : TEXCOORD0, \n"
" out float4 l_color : COLOR, \n"
" uniform float4 mspos_light, \n"
" uniform float4x4 mat_modelproj) \n"
"{ \n"
" l_position = mul(mat_modelproj, vtx_position); \n"
" float3 N = normalize(vtx_normal); \n"
" float3 lightVector = normalize(mspos_light - vtx_position); \n"
" l_brite = max(dot(N,lightVector), 0); \n"
" l_color = vtx_color; \n"
"} \n"
" \n"
" \n"
"void fshader(float4 l_brite : TEXCOORD0, \n"
" float4 l_color : COLOR, \n"
" out float4 o_color : COLOR) \n"
"{ \n"
" if (l_brite.x<0.5) l_brite=0.8; \n"
" else l_brite=1.2; \n"
" o_color=l_brite * l_color; \n"
"} \n"
);
CPT(RenderAttrib) rattr = rs->get_shader();
if (rattr == 0) rattr = ShaderAttrib::make();
return DCAST(ShaderAttrib, rattr)->set_shader(shader);
int num_textures = 0;
if (attribs._texture) {
num_textures = attribs._texture->get_num_on_stages();
}
ostringstream text;
CPT(RenderAttrib) rattrib = ShaderAttrib::make();
text << "//Cg\n";
text << "void vshader(\n";
for (int i=0; i<num_textures; i++) {
text << "\t float2 vtx_texcoord" << i << " : TEXCOORD" << i << ",\n";
text << "\t out float2 l_texcoord" << i << " : TEXCOORD" << i << ",\n";
}
text << "\t float4 vtx_position : POSITION,\n";
text << "\t out float4 l_position : POSITION,\n";
text << "\t uniform float4x4 mat_modelproj\n";
text << ") {\n";
text << "\t l_position = mul(mat_modelproj, vtx_position);\n";
for (int i=0; i<num_textures; i++) {
text << "\t l_texcoord" << i << " = vtx_texcoord" << i << ";\n";
}
text << "}\n\n";
text << "void fshader(\n";
for (int i=0; i<num_textures; i++) {
text << "\t in float2 l_texcoord" << i << " : TEXCOORD" << i << ",\n";
text << "\t uniform sampler2D tex_" << i << ",\n";
}
text << "\t out float4 o_color : COLOR\n";
text << ") {\n";
text << "\t o_color = float4(1,1,1,1);\n";
for (int i=0; i<num_textures; i++) {
text << "\t o_color *= tex2D(tex_" << i << ", l_texcoord" << i << ");\n";
}
text << "}\n";
// Insert the shader into the shader attrib.
PT(Shader) shader = Shader::make(text.str());
rattrib = DCAST(ShaderAttrib, rattrib)->set_shader(shader);
return rattrib;
}