static void
Init(void)
{
if (!ShadersSupported())
exit(1);
vertShader = CompileShaderText(GL_VERTEX_SHADER, VertShaderText);
fragShader = CompileShaderText(GL_FRAGMENT_SHADER, FragShaderText);
program = LinkShaders(vertShader, fragShader);
glUseProgram(program);
SetUniformValues(program, Uniforms);
PrintUniforms(Uniforms);
assert(glGetError() == 0);
glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
assert(glIsProgram(program));
assert(glIsShader(fragShader));
assert(glIsShader(vertShader));
glColor3f(1, 0, 0);
}
static void menu_selected(int entry)
{
switch (entry) {
case QUIT:
exit(0);
break;
default:
Uniforms[0].value[0] = entry;
}
SetUniformValues(program, Uniforms);
glutPostRedisplay();
}
static void
Init(void)
{
if (!ShadersSupported())
exit(1);
vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile);
fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile);
program = LinkShaders(vertShader, fragShader);
glUseProgram(program);
SetUniformValues(program, Uniforms);
PrintUniforms(Uniforms);
assert(glGetError() == 0);
glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
glEnable(GL_DEPTH_TEST);
glColor3f(1, 0, 0);
}
static void init(void)
{
static const char *fragShaderText =
"void main() {\n"
" gl_FragColor = gl_Color;\n"
"}\n";
static const char *vertShaderText =
"void main() {\n"
" gl_FrontColor = gl_Color;\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
"}\n";
static const char *geoShaderText =
"#version 120\n"
"#extension GL_ARB_geometry_shader4 : enable\n"
"void main()\n"
"{\n"
" for(int i = 0; i < gl_VerticesIn; ++i)\n"
" {\n"
" gl_FrontColor = gl_FrontColorIn[i];\n"
" gl_Position = gl_PositionIn[i];\n"
" EmitVertex();\n"
" }\n"
"}\n";
if (!ShadersSupported())
exit(1);
if (!glutExtensionSupported("GL_ARB_geometry_shader4")) {
printf("This demo requires GL_ARB_geometry_shader4\n");
exit(1);
}
menu_init();
fragShader = glCreateShader(GL_FRAGMENT_SHADER);
load_and_compile_shader(fragShader, fragShaderText);
vertShader = glCreateShader(GL_VERTEX_SHADER);
load_and_compile_shader(vertShader, vertShaderText);
geoShader = glCreateShader(GL_GEOMETRY_SHADER_ARB);
if (filename)
read_shader(geoShader, filename);
else
load_and_compile_shader(geoShader,
geoShaderText);
program = glCreateProgram();
glAttachShader(program, vertShader);
glAttachShader(program, geoShader);
glAttachShader(program, fragShader);
glProgramParameteriARB(program, GL_GEOMETRY_INPUT_TYPE_ARB,
GL_LINES_ADJACENCY_ARB);
glProgramParameteriARB(program, GL_GEOMETRY_OUTPUT_TYPE_ARB,
GL_LINE_STRIP);
{
int temp;
glGetIntegerv(GL_MAX_GEOMETRY_OUTPUT_VERTICES_ARB,&temp);
glProgramParameteriARB(program,GL_GEOMETRY_VERTICES_OUT_ARB,temp);
}
glLinkProgram(program);
check_link(program);
glUseProgram(program);
SetUniformValues(program, Uniforms);
PrintUniforms(Uniforms);
assert(glGetError() == 0);
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
glVertexPointer( 3, GL_FLOAT, sizeof(vertices[0]), vertices );
glColorPointer( 4, GL_FLOAT, sizeof(color[0]), color );
}
