void CAdvWater::Draw(bool useBlending)
{
if (!mapInfo->water.forceRendering && (readmap->currMinHeight > 1.0f)) {
return;
}
float3 base = camera->CalcPixelDir(globalRendering->viewPosX, globalRendering->viewSizeY);
float3 dv = camera->CalcPixelDir(globalRendering->viewPosX, 0) - camera->CalcPixelDir(globalRendering->viewPosX, globalRendering->viewSizeY);
float3 dh = camera->CalcPixelDir(globalRendering->viewPosX + globalRendering->viewSizeX, 0) - camera->CalcPixelDir(globalRendering->viewPosX, 0);
float3 xbase;
const int numDivs = 20;
base *= numDivs;
float maxY = -0.1f;
float yInc = 1.0f / numDivs;
float screenY = 1;
unsigned char col[4];
col[0] = (unsigned char)(waterSurfaceColor.x * 255);
col[1] = (unsigned char)(waterSurfaceColor.y * 255);
col[2] = (unsigned char)(waterSurfaceColor.z * 255);
glDisable(GL_ALPHA_TEST);
if (useBlending) {
glEnable(GL_BLEND);
} else {
glDisable(GL_BLEND);
}
glDepthMask(0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_2D, bumpTexture);
GLfloat plan[] = {0.02f, 0, 0, 0};
glTexGeni(GL_S,GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_S,GL_EYE_PLANE, plan);
glEnable(GL_TEXTURE_GEN_S);
GLfloat plan2[] = {0, 0, 0.02f, 0};
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_T, GL_EYE_PLANE, plan2);
glEnable(GL_TEXTURE_GEN_T);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D, reflectTexture);
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, waterFP);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
float3 forward = camera->forward;
forward.y = 0;
forward.ANormalize();
glProgramEnvParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, forward.z, forward.x, 0, 0);
glProgramEnvParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, -forward.x, forward.z, 0, 0);
CVertexArray* va = GetVertexArray();
va->Initialize();
va->EnlargeArrays(5*numDivs*(numDivs + 1)*2, 5*numDivs, VA_SIZE_TC); //! alloc room for all vertexes and strips
float3 dir, zpos;
for (int a = 0; a < 5; ++a) { //! CAUTION: loop count must match EnlargeArrays above
bool maxReached = false;
for (int y = 0; y < numDivs; ++y) {
dir = base;
dir.ANormalize();
if (dir.y >= maxY) {
maxReached = true;
break;
}
xbase = base;
for (int x = 0; x < numDivs + 1; ++x) { //! CAUTION: loop count must match EnlargeArrays above
dir = xbase + dv;
dir.ANormalize();
zpos = camera->pos + dir*(camera->pos.y / -dir.y);
zpos.y = sin(zpos.z*0.1f + gs->frameNum*0.06f)*0.06f + 0.05f;
col[3] = (unsigned char)((0.8f + 0.7f*dir.y)*255);
va->AddVertexQTC(zpos, x*(1.0f/numDivs), screenY - yInc, col);
dir = xbase;
dir.ANormalize();
zpos = camera->pos + dir*(camera->pos.y / -dir.y);
zpos.y = sin(zpos.z*0.1f + gs->frameNum*0.06f)*0.06f + 0.05f;
col[3] = (unsigned char)((0.8f + 0.7f*dir.y)*255);
va->AddVertexQTC(zpos, x*(1.0f/numDivs), screenY, col);
xbase += dh;
}
va->EndStripQ();
base += dv;
screenY -= yInc;
}
if (!maxReached) {
break;
}
dv *= 0.5f;
maxY *= 0.5f;
yInc *= 0.5f;
}
va->DrawArrayTC(GL_TRIANGLE_STRIP);
glDepthMask(1);
glDisable(GL_FRAGMENT_PROGRAM_ARB);
glActiveTextureARB(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glActiveTextureARB(GL_TEXTURE0_ARB);
if (!useBlending) { // for translucent stuff like water, the default mode is blending and alpha testing enabled
glEnable(GL_BLEND);
}
}
