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progs/glsl: let the mouse rotate the scene

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RALOVICH, Kristóf
2010-03-27 22:11:29 -04:00
committed by Brian Paul
parent 1cbd510688
commit 8ca937fc3b
2 changed files with 84 additions and 32 deletions
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69
progs/glsl/fsraytrace.c
View File

@@ -27,23 +27,23 @@
#include <GL/glew.h>
#include <GL/glut.h>
#include "shaderutil.h"
#include <math.h>
static int Win;
static int WinWidth = 512, WinHeight = 512;
static GLfloat Xrot = 0, Yrot = 0;
static int mouseGrabbed = 0;
static GLuint vertShader;
static GLuint fragShader;
static GLuint program;
static float rot[9] = {1,0,0, 0,1,0, 0,0,1};
static const char* vsSource =
"varying vec2 rayDir;\n"
"\n"
"void main()\n"
"{\n"
" rayDir = gl_MultiTexCoord0.xy - vec2(0.5,0.5);\n"
" gl_Position = gl_ProjectionMatrix * gl_Vertex;\n"
"varying vec2 rayDir; \n"
" \n"
"void main() \n"
"{ \n"
" rayDir = gl_MultiTexCoord0.xy - vec2(0.5,0.5); \n"
" gl_Position = gl_ProjectionMatrix * gl_Vertex; \n"
"}\n";
static const char* fsSource =
@@ -213,29 +213,46 @@ static const char* fsSource =
" clamp(dot(reflect(-L,N),camera_dir),0.0,1.0),16.0); \n"
"} \n"
" \n"
"\n"
"void\n"
"main()\n"
"{\n"
" const float z = -0.5;\n"
"void main() \n"
"{ \n"
" const float z = -0.5; \n"
" const vec3 cameraPos = vec3(0,0,3); \n"
" Ray r = Ray(cameraPos, normalize(vec3(rayDir, z) * rot));\n"
" gl_FragColor = trace1(r);\n"
" Ray r = Ray(cameraPos, normalize(vec3(rayDir, z) * rot)); \n"
" gl_FragColor = trace1(r); \n"
"}\n";
static void
Idle(void)
static inline
float
deg2rad(const float degree)
{
glutPostRedisplay();
return( degree * 0.017453292519943295769236907684886F);
}
static inline void
rotate_xy(float* mat3, const float degreesAroundX, const float degreesAroundY)
{
const float rad1 = deg2rad(degreesAroundX);
const float c1 = cosf(rad1);
const float s1 = sinf(rad1);
const float rad2 = deg2rad(degreesAroundY);
const float c2 = cosf(rad2);
const float s2 = sinf(rad2);
mat3[0] = c2; mat3[3] = 0.0F; mat3[6] = s2;
mat3[1] = s1*s2; mat3[4] = c1; mat3[7] = -s1*c2;
mat3[2] = -c1*s2;mat3[5] = s1; mat3[8] = c1*c2;
}
static inline void
identity(float* mat3)
{
mat3[0] = 1.0F; mat3[3] = 0.0F; mat3[6] = 0.0F;
mat3[1] = 0.0F; mat3[4] = 1.0F; mat3[7] = 0.0F;
mat3[2] = 0.0F; mat3[5] = 0.0F; mat3[8] = 1.0F;
}
static void
Draw(void)
{
float rot[9] = {1,0,0, 0,1,0, 0,0,1};
GLint location = glGetUniformLocation(program, "rot");
static const float m = -10.F;
static const float p = 10.F;
@@ -311,9 +328,11 @@ drag(int x, int y)
float scale = 1.5F;
if(mouseGrabbed)
{
Xrot = (float)(x - WinWidth/2) / scale;
Yrot = (float)(y - WinHeight/2) / scale;
printf("%4.2f %4.2f\n", Xrot, Yrot);
static GLfloat xRot = 0, yRot = 0;
xRot = (float)(x - WinWidth/2) / scale;
yRot = (float)(y - WinHeight/2) / scale;
identity(rot);
rotate_xy(rot, yRot, xRot);
}
}
@@ -380,7 +399,7 @@ main(int argc, char *argv[])
glutDisplayFunc(Draw);
glutMouseFunc(mouse);
glutPassiveMotionFunc(drag);
glutIdleFunc(Idle);
glutIdleFunc(Draw);
Init();
glutMainLoop();
return 0;

47
progs/glsl/vsraytrace.c
View File

@@ -27,11 +27,14 @@
#include <GL/glew.h>
#include <GL/glut.h>
#include "shaderutil.h"
#include <math.h>
static int Win;
static int WinWidth = 256, WinHeight = 256;
static int mouseGrabbed = 0;
static GLuint vertShader;
static GLuint program;
float rot[9] = {1,0,0, 0,1,0, 0,0,1};
static const char* vsSource =
"const float INF = 9999.9; \n"
@@ -206,11 +209,37 @@ static const char* vsSource =
" Ray ray = Ray(cameraPos, rayDir); \n"
" gl_Position = gl_Vertex; \n"
" gl_FrontColor = trace1(ray); \n"
"} \n";
"}\n";
static GLuint vertShader;
static GLuint program;
static inline
float
deg2rad(const float degree)
{
return( degree * 0.017453292519943295769236907684886F);
}
static inline void
rotate_xy(float* mat3, const float degreesAroundX, const float degreesAroundY)
{
const float rad1 = deg2rad(degreesAroundX);
const float c1 = cosf(rad1);
const float s1 = sinf(rad1);
const float rad2 = deg2rad(degreesAroundY);
const float c2 = cosf(rad2);
const float s2 = sinf(rad2);
mat3[0] = c2; mat3[3] = 0.0F; mat3[6] = s2;
mat3[1] = s1*s2; mat3[4] = c1; mat3[7] = -s1*c2;
mat3[2] = -c1*s2;mat3[5] = s1; mat3[8] = c1*c2;
}
static inline void
identity(float* mat3)
{
mat3[0] = 1.0F; mat3[3] = 0.0F; mat3[6] = 0.0F;
mat3[1] = 0.0F; mat3[4] = 1.0F; mat3[7] = 0.0F;
mat3[2] = 0.0F; mat3[5] = 0.0F; mat3[8] = 1.0F;
}
static void
Draw(void)
@@ -219,7 +248,6 @@ Draw(void)
const float h = 0.5F * WinHeight;
int x,y;
float rot[9] = {1,0,0, 0,1,0, 0,0,1};
GLint location = glGetUniformLocation(program, "rot");
glUseProgram(program);
@@ -287,9 +315,14 @@ static
void
drag(int x, int y)
{
float scale = 1.5F;
if(mouseGrabbed)
{
printf("%4d %4d\n", x, y);
static GLfloat xRot = 0, yRot = 0;
xRot = (float)(x - WinWidth/2) / scale;
yRot = (float)(y - WinHeight/2) / scale;
identity(rot);
rotate_xy(rot, yRot, xRot);
}
}
@@ -355,7 +388,7 @@ main(int argc, char *argv[])
glutDisplayFunc(Draw);
glutIdleFunc(Draw);
glutMouseFunc(mouse);
glutMotionFunc(drag);
glutPassiveMotionFunc(drag);
Init();
glutMainLoop();
return 0;