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adds optional shaders to vary the point size based on the brightness

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This commit is contained in:
tosh 2013-03-29 19:04:47 +01:00
parent 002d607e9f
commit e03bbec6fc
2 changed files with 38 additions and 4 deletions
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1
interface/src/starfield/Config.h
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@ -34,6 +34,7 @@
//
#include "InterfaceConfig.h"
#include "OGlProgram.h"
#include <cstddef>
#include <cfloat>

41
interface/src/starfield/renderer/Renderer.h
View file

@ -70,6 +70,8 @@ namespace starfield {
GLint* _arrBatchOffs;
GLsizei* _arrBatchCount;
GLuint _hndVertexArray;
OGlProgram _objProgram;
Tiling _objTiling;
unsigned* _itrOutIndex;
@ -426,7 +428,32 @@ namespace starfield {
#endif
void glAlloc() {
// glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
GLchar const* const VERTEX_SHADER =
"#version 120\n"
"void main(void) {\n"
" vec3 c = gl_Color.rgb * 1.0125;\n"
" float s = max(1.0, dot(c, c) * 0.7);\n"
" gl_Position = ftransform();\n"
" gl_FrontColor= gl_Color;\n"
" gl_PointSize = s;\n"
"}\n";
_objProgram.addShader(GL_VERTEX_SHADER, VERTEX_SHADER);
GLchar const* const FRAGMENT_SHADER =
"#version 120\n"
"void main(void) {\n"
" gl_FragColor = gl_Color;\n"
"}\n";
_objProgram.addShader(GL_FRAGMENT_SHADER, FRAGMENT_SHADER);
_objProgram.link();
// glDisable(GL_VERTEX_PROGRAM_POINT_SIZE);
glGenVertexArrays(1, & _hndVertexArray);
}
void glFree() {
@ -466,18 +493,24 @@ namespace starfield {
glPushMatrix();
glLoadMatrixf(matrix);
// render
glBindVertexArray(_hndVertexArray);
// set point size and smoothing + shader control
glPointSize(1.0f);
glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glPointSize(1.42f);
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
// select shader and vertex array
_objProgram.activate();
glBindVertexArray(_hndVertexArray);
// render
glMultiDrawArrays(GL_POINTS,
_arrBatchOffs, _arrBatchCount, n_ranges);
// restore state
glBindVertexArray(0);
glUseProgram(0);
glDisable(GL_VERTEX_PROGRAM_POINT_SIZE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();