/*! \brief Draw all the elements in the current buffer multiple
* times using instancing.
*/
inline void drawInstancedElements(element_type::Enum type, size_t instances)
{
initTest();
bind(buffer_targets::ELEMENT_ARRAY);
if (GLEW_EXT_draw_instanced)
glDrawElementsInstancedEXT(type, size(), detail::c_type_to_gl_enum<T>::val, 0, instances);
else if (GLEW_ARB_draw_instanced)
glDrawElementsInstancedEXT(type, size(), detail::c_type_to_gl_enum<T>::val, 0, instances);
else
M_throw() << "Cannot perform instanced drawing, GL_ARB_draw_instanced/GL_EXT_draw_instanced extensions are missing.";
}
inline void VL_glDrawElementsInstanced(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices, GLsizei primcount)
{
if (glDrawElementsInstanced)
glDrawElementsInstanced(mode, count, type, indices, primcount);
else
if (glDrawElementsInstancedARB)
glDrawElementsInstancedARB(mode, count, type, indices, primcount);
else
if (glDrawElementsInstancedEXT)
glDrawElementsInstancedEXT(mode, count, type, indices, primcount);
else
VL_UNSUPPORTED_FUNC();
}
inline void gl_draw_elements_instanced(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices, GLsizei instancecount)
{
#if defined(__OSX__)
glDrawElementsInstanced(mode, count, type, indices, instancecount);
#elif defined(__IOS__)
#if defined(__OPENGL_20__)
glDrawElementsInstancedEXT(mode, count, type, indices, instancecount);
#else
glDrawElementsInstanced(mode, count, type, indices, instancecount);
#endif
#endif
#if defined(DEBUG)
gl_get_error();
#endif
}
void display(void)
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
if(displayError)
{
orthographicView();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
txtInstructions.render((screenWidth - txtInstructions.getTextureWidth()) / 2.0f, (screenHeight - txtInstructions.getTextureHeight()) / 2.0f);
glFlush();
return;
}
glPushMatrix();
// Setup the navigation
glTranslated(0, 0, -zoom);
glRotatef(camRotateX, 1, 0, 0);
glRotatef(camRotateY, 0, 1, 0);
glTranslated(0, ROOM_SIZE, 0);
// Setup drawing for the scene.
perspectiveView();
#if _USE_MT
// If the render thread needs to wait for new spheres to be added.
while(pauseSimulation)
{
boost::this_thread::yield();
}
threadStarted();
#endif
renderFrame++;
renderFrameCounter++;
glEnable(GL_DEPTH_TEST);
glColor3f(1.0f, 1.0f, 1.0f);
glUseProgram(g_program);
glUniform3fv(g_programCameraPositionLocation, 1, g_cameraPosition);
glUniform3fv(g_programLightDirectionLocation, 1, g_lightDirection);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, sphereMesh.indexBufferId);
// We are using instanced rendering, however we cannot draw all the spheres at once.
// So we have a maximum number of objects that can be rendered at once and we'll just
// render that many at a time until we have less spheres than MAX_OBJECTS_PER_RENDER
// left to render.
for(int objectIndex = 0; objectIndex < numSpheres; objectIndex += MAX_OBJECTS_PER_RENDER)
{
int numObjects = MAX_OBJECTS_PER_RENDER;
// Are we going to be rendering more spheres than we should?
if (numObjects + objectIndex > numSpheres)
{
numObjects = numSpheres - objectIndex;
}
Vector3 *positionIndex = spherePositions + objectIndex;
glUniform4fv(g_programObjectPositionLocation, numObjects, (float *)positionIndex);
// Tell the shader the size of the user sphere.
// Due to the way the shader renders multiple instances, it only knows the id
// of the current instance it is rendering, which does not reflect the sphere's actual
// id.
// So we will set that the size of the userSphere only on the first instanced render
// and all later renders it will be zero.
glUniform1f(g_programUserSphereLocation, (objectIndex == 0) * userSphereSize);
glDrawElementsInstancedEXT(GL_TRIANGLES, sphereMesh.numIndicies, GL_UNSIGNED_INT, 0, numObjects);
}
glUseProgram(0);
#if _USE_MT
threadStopped();
#endif
glPopMatrix();
// Setup drawing for the interface.
orthographicView();
char buff[64];
sprintf(buff, "FPS: %d", framesPerSecond);
txtRenderFrames.setText(buff);
sprintf(buff, "PPS: %.1f", physicsPerSecond);
txtPhysicsFrames.setText(buff);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
float yPos = -2.0f;
txtInstructions.render(10, yPos += 12.0f);
txtInstructions2.render(10, yPos += 12.0f);
txtNumThreads.render(10, yPos += 12.0f);
txtNumSpheres.render(10, yPos += 12.0f);
txtRenderFrames.render(10, yPos += 12.0f);
txtPhysicsFrames.render(10, yPos += 12.0f);
glDisable(GL_BLEND);
glFlush();
}
bool drawCallback(CPUTModel* pModel, CPUTRenderParameters &renderParams, CPUTMesh* pMesh, CPUTMaterialEffect* pMaterial, CPUTMaterialEffect* , void* )
{
UINT mVertexCount = 0;
UINT mIndexCount = 0;
int index = 0;
float rows = 0.0;
float columns = 0.0;
float instances = 0.0;
float angle_value = 0.0;
// Uniform locations
GLint vpMatrixBufferLoc = -1;
GLint worldMatrixBufferLoc = -1;
float4x4 viewProj;
float4x4 parents_world;
rows = (float) currentRowCount;
columns = (float) currentColCount;
angle_value = 360.0 / columns;
const int numInstances = (int)columns * (int) rows;
pMaterial->SetRenderStates(renderParams);
parents_world = pModel->GetParentsWorldMatrix();
CPUTCamera *pCamera = renderParams.mpCamera;
// Set Uniform Data
if(pCamera)
{
viewProj = *pCamera->GetViewMatrix() * *pCamera->GetProjectionMatrix();
}
// Drawing
mVertexCount = ((CPUTMeshOGL*)pMesh)->GetVertexCount();
mIndexCount = ((CPUTMeshOGL*)pMesh)->GetIndexCount();
CPUTBufferOGL * mpIndexBuffer = ((CPUTMeshOGL*)pMesh)->GetIndexBuffer();
if(mVertexCount == 0 && mIndexCount == 0)
return false;
((CPUTMeshOGL*)pMesh)->EnableVertexArray();
CPUTMaterialEffectOGL *pMatEffect = (CPUTMaterialEffectOGL*) pMaterial;
GLuint shaderProgID = pMatEffect->GetShaderID();
vpMatrixBufferLoc = glGetUniformLocation( shaderProgID, "viewProjMatrix" );
worldMatrixBufferLoc = glGetUniformLocation( shaderProgID, "worldMatrix" );
if( isInstanced )
{
glUniformMatrix4fv( vpMatrixBufferLoc, 1, GL_FALSE, (const GLfloat *) &viewProj );
glUniformMatrix4fv( worldMatrixBufferLoc, numInstances, GL_FALSE, (const GLfloat *) &world[0] );
if(mpIndexBuffer != NULL)
GL_CHECK(glDrawElementsInstancedEXT( GL_TRIANGLES, mIndexCount, GL_UNSIGNED_INT, NULL, numInstances ));
else
GL_CHECK(glDrawArraysInstanced(GL_TRIANGLES, 0, numInstances, mVertexCount));
}
else
{
index = 0;
glUniformMatrix4fv( vpMatrixBufferLoc, 1, GL_FALSE, (const GLfloat *) &viewProj );
for (int i = 0; i < rows; ++i)
{
for (int j = 0; j < columns; ++j)
{
glUniformMatrix4fv( worldMatrixBufferLoc, 1, GL_FALSE, (const GLfloat *) &world[index] );
if(mpIndexBuffer != NULL)
GL_CHECK(glDrawElements(GL_TRIANGLES, mIndexCount, GL_UNSIGNED_INT, NULL));
else
GL_CHECK(glDrawArrays(GL_TRIANGLES, 0, mVertexCount));
++index;
}
}
}
((CPUTMeshOGL*)pMesh)->DisableVertexArray();
glUseProgram(0);
return true;
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_EXTDrawInstanced_nglDrawElementsInstancedEXTBO(JNIEnv *env, jclass clazz, jint mode, jint count, jint type, jlong indices_buffer_offset, jint primcount, jlong function_pointer) {
const GLvoid *indices_address = (const GLvoid *)(intptr_t)offsetToPointer(indices_buffer_offset);
glDrawElementsInstancedEXTPROC glDrawElementsInstancedEXT = (glDrawElementsInstancedEXTPROC)((intptr_t)function_pointer);
glDrawElementsInstancedEXT(mode, count, type, indices_address, primcount);
}