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code to draw engine block

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This commit is contained in:
Brian Paul
2006-08-01 20:03:05 +00:00
parent 90d7b9c9eb
commit f05e7eba95
1 changed files with 205 additions and 11 deletions
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216
progs/demos/engine.c
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@@ -47,6 +47,7 @@ typedef struct
GLuint CrankList;
GLuint ConnRodList;
GLuint PistonList;
GLuint BlockList;
} Engine;
@@ -80,6 +81,7 @@ typedef struct
GLboolean UseLists;
GLboolean DrawBox;
GLboolean ShowInfo;
GLboolean ShowBlock;
} RenderInfo;
@@ -87,9 +89,10 @@ static GLUquadric *Q;
static GLfloat Theta = 0.0;
static GLfloat PistonColor[4] = { 1.0, 0.5, 0.5, 1.0 };
static GLfloat ConnRodColor[4] = { 0.7, 1.0, 0.7, 1.0 };
static GLfloat CrankshaftColor[4] = { 0.7, 0.7, 1.0, 1.0 };
static const GLfloat PistonColor[4] = { 1.0, 0.5, 0.5, 1.0 };
static const GLfloat ConnRodColor[4] = { 0.7, 1.0, 0.7, 1.0 };
static const GLfloat CrankshaftColor[4] = { 0.7, 0.7, 1.0, 1.0 };
static const GLfloat BlockColor[4] = {0.8, 0.8, 0.8, 0.75 };
static GLuint TextureObj;
static GLint WinWidth = 800, WinHeight = 500;
@@ -113,7 +116,7 @@ static Engine Engines[NUM_ENGINES] =
0.25, /* CrankPinRadius */
0.3, /* CrankJournalRadius */
0.4, /* CrankJournalLength */
1.3, /* ConnectingRodLength */
1.5, /* ConnectingRodLength */
0.1 /* ConnectingRodThickness */
},
{
@@ -129,7 +132,7 @@ static Engine Engines[NUM_ENGINES] =
0.25, /* CrankPinRadius */
0.3, /* CrankJournalRadius */
0.4, /* CrankJournalLength */
1.3, /* ConnectingRodLength */
1.5, /* ConnectingRodLength */
0.1 /* ConnectingRodThickness */
},
{
@@ -145,7 +148,7 @@ static Engine Engines[NUM_ENGINES] =
0.25, /* CrankPinRadius */
0.3, /* CrankJournalRadius */
0.4, /* CrankJournalLength */
1.3, /* ConnectingRodLength */
1.5, /* ConnectingRodLength */
0.1 /* ConnectingRodThickness */
}
};
@@ -180,6 +183,7 @@ InitRenderInfo(RenderInfo *render)
render->Texture = GL_FALSE;
render->DrawBox = GL_FALSE;
render->ShowInfo = GL_TRUE;
render->ShowBlock = GL_FALSE;
render->UseLists = GL_FALSE;
}
@@ -190,6 +194,9 @@ InitRenderInfo(RenderInfo *render)
static void
SetRenderState(RenderMode mode)
{
static const GLfloat gray2[4] = { 0.2, 0.2, 0.2, 1.0 };
static const GLfloat gray4[4] = { 0.4, 0.4, 0.4, 1.0 };
/* defaults */
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
@@ -198,6 +205,7 @@ SetRenderState(RenderMode mode)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, gray2);
switch (mode) {
case LIT:
@@ -214,6 +222,7 @@ SetRenderState(RenderMode mode)
glEnable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, gray4);
break;
default:
;
@@ -269,6 +278,19 @@ PistonShaftPosition(const Engine *eng, int piston)
}
/**
* Compute distance between two adjacent pistons
*/
static float
PistonSpacing(const Engine *eng)
{
const int pistonsPerCrank = eng->Pistons / eng->Cranks;
const float z0 = PistonShaftPosition(eng, 0);
const float z1 = PistonShaftPosition(eng, pistonsPerCrank);
return z1 - z0;
}
/**
* (x0, y0) = position of big end on crankshaft
* (x1, y1) = position of small end on piston
@@ -517,6 +539,144 @@ DrawPositionedConnectingRod(const Engine *eng, float crankAngle)
}
/**
* Draw a square with a hole in middle.
*/
static void
SquareWithHole(float squareSize, float holeRadius)
{
int i;
glBegin(GL_QUAD_STRIP);
glNormal3f(0, 0, 1);
for (i = 0; i <= 360; i += 5) {
const float x1 = holeRadius * cos(DEG_TO_RAD(i));
const float y1 = holeRadius * sin(DEG_TO_RAD(i));
float x2, y2;
if (i > 315 || i <= 45) {
x2 = squareSize;
y2 = squareSize * tan(DEG_TO_RAD(i));
}
else if (i > 45 && i <= 135) {
x2 = -squareSize * tan(DEG_TO_RAD(i - 90));
y2 = squareSize;
}
else if (i > 135 && i <= 225) {
x2 = -squareSize;
y2 = -squareSize * tan(DEG_TO_RAD(i-180));
}
else if (i > 225 && i <= 315) {
x2 = squareSize * tan(DEG_TO_RAD(i - 270));
y2 = -squareSize;
}
glVertex2f(x1, y1); /* inner circle */
glVertex2f(x2, y2); /* outer square */
}
glEnd();
}
/**
* Draw block with hole through middle.
* Hole is centered on Z axis.
* Bottom of block is at z=0, top of block is at z = blockHeight.
* index is in [0, count - 1] to determine which block faces are drawn.
*/
static void
DrawBlockWithHole(float blockSize, float blockHeight, float holeRadius,
int index, int count)
{
const int slices = 30, stacks = 4;
const float x = blockSize;
const float y = blockSize;
const float z0 = 0;
const float z1 = blockHeight;
assert(index < count);
assert(Q);
gluQuadricOrientation(Q, GLU_INSIDE);
glBegin(GL_QUADS);
/* +X face */
glNormal3f(1, 0, 0);
glVertex3f( x, -y, z0);
glVertex3f( x, y, z0);
glVertex3f( x, y, z1);
glVertex3f( x, -y, z1);
/* -X face */
glNormal3f(-1, 0, 0);
glVertex3f(-x, -y, z1);
glVertex3f(-x, y, z1);
glVertex3f(-x, y, z0);
glVertex3f(-x, -y, z0);
if (index == 0) {
/* +Y face */
glNormal3f(0, 1, 0);
glVertex3f(-x, y, z1);
glVertex3f( x, y, z1);
glVertex3f( x, y, z0);
glVertex3f(-x, y, z0);
}
if (index == count - 1) {
/* -Y face */
glNormal3f(0, -1, 0);
glVertex3f(-x, -y, z0);
glVertex3f( x, -y, z0);
glVertex3f( x, -y, z1);
glVertex3f(-x, -y, z1);
}
glEnd();
/* cylinder / hole */
gluCylinder(Q, holeRadius, holeRadius, blockHeight, slices, stacks);
/* face at z0 */
glPushMatrix();
glRotatef(180, 1, 0, 0);
SquareWithHole(blockSize, holeRadius);
glPopMatrix();
/* face at z1 */
glTranslatef(0, 0, z1);
SquareWithHole(blockSize, holeRadius);
gluQuadricOrientation(Q, GLU_OUTSIDE);
}
/**
* Draw the engine block.
*/
static void
DrawEngineBlock(const Engine *eng)
{
const float blockHeight = eng->Throw + 1.5 * eng->PistonHeight;
const float cylRadius = 1.01 * eng->PistonRadius;
const float blockSize = 0.5 * PistonSpacing(eng);
const int pistonsPerCrank = eng->Pistons / eng->Cranks;
int i;
for (i = 0; i < eng->Pistons; i++) {
const float z = PistonShaftPosition(eng, i);
const int crank = i / pistonsPerCrank;
int k;
glPushMatrix();
glTranslatef(0, 0, z);
/* additional rotation for kth piston per crank */
k = i % pistonsPerCrank;
glRotatef(k * -eng->V_Angle, 0, 0, 1);
/* the block */
glRotatef(-90, 1, 0, 0);
glTranslatef(0, 0, eng->Throw * 2);
DrawBlockWithHole(blockSize, blockHeight, cylRadius,
crank, eng->Cranks);
glPopMatrix();
}
}
/**
* Generate display lists for engine parts.
*/
@@ -538,6 +698,11 @@ GenerateDisplayLists(Engine *eng)
glNewList(eng->PistonList, GL_COMPILE);
DrawPiston(eng);
glEndList();
eng->BlockList = glGenLists(1);
glNewList(eng->BlockList, GL_COMPILE);
DrawEngineBlock(eng);
glEndList();
}
@@ -553,10 +718,11 @@ FreeDisplayLists(Engine *eng)
eng->ConnRodList = 0;
glDeleteLists(eng->PistonList, 1);
eng->PistonList = 0;
glDeleteLists(eng->BlockList, 1);
eng->BlockList = 0;
}
/**
* Draw complete engine.
* \param eng description of engine to draw
@@ -602,10 +768,32 @@ DrawEngine(const Engine *eng, float crankAngle)
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, ConnRodColor);
glColor4fv(ConnRodColor);
DrawPositionedConnectingRod(eng, rot);
glPopMatrix();
}
if (Render.ShowBlock) {
const GLboolean blend = glIsEnabled(GL_BLEND);
glDepthMask(GL_FALSE);
if (!blend) {
glEnable(GL_BLEND);
}
glEnable(GL_CULL_FACE);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, BlockColor);
glColor4fv(BlockColor);
if (eng->CrankList)
glCallList(eng->BlockList);
else
DrawEngineBlock(eng);
glDisable(GL_CULL_FACE);
glDepthMask(GL_TRUE);
if (!blend) {
glDisable(GL_BLEND);
}
}
glPopMatrix();
}
@@ -745,9 +933,9 @@ Draw(void)
glPushMatrix();
glTranslatef(0, -0.75, 0);
DrawEngine(Engines + CurEngine, Theta);
if (Render.DrawBox)
DrawBox();
DrawEngine(Engines + CurEngine, Theta);
glPopMatrix();
glPopMatrix();
@@ -899,6 +1087,12 @@ OptDisplayLists(void)
}
}
static void
OptShowBlock(void)
{
Render.ShowBlock = !Render.ShowBlock;
}
static void
OptShowInfo(void)
{
@@ -940,8 +1134,9 @@ static const MenuInfo MenuItems[] = {
{ "Change Engine", 'e', OptChangeEngine },
{ "Rendering Style", 'm', OptRenderMode },
{ "Display Lists", 'd', OptDisplayLists },
{ "Show Block", 'b', OptShowBlock },
{ "Show Info", 'i', OptShowInfo },
{ "Show Box", 'b', OptShowBox },
{ "Show Box", 'x', OptShowBox },
{ "Exit", 27, OptExit },
{ NULL, 'r', OptRotate },
{ NULL, 0, NULL }
@@ -1070,7 +1265,6 @@ Init(void)
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
glEnable(GL_NORMALIZE);
glBlendFunc(GL_SRC_ALPHA, GL_ZERO);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
InitViewInfo(&View);